{"id":30253,"date":"2026-09-02T00:42:40","date_gmt":"2026-09-01T19:12:40","guid":{"rendered":"https:\/\/internshala.com\/blog\/?p=30253"},"modified":"2026-09-02T00:42:43","modified_gmt":"2026-09-01T19:12:43","slug":"rest-api-interview-questions-and-answers","status":"publish","type":"post","link":"https:\/\/internshala.com\/blog\/rest-api-interview-questions-and-answers\/","title":{"rendered":"50 REST API Interview Questions and Answers for Freshers and Experienced"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"427\" src=\"https:\/\/internshala.com\/blog\/wp-content\/uploads\/2026\/09\/Top-REST-API-Interview-Questions-and-Answers-1024x427.png\" alt=\"REST API Interview Questions\" class=\"wp-image-30254\" srcset=\"https:\/\/internshala.com\/blog\/wp-content\/uploads\/2026\/09\/Top-REST-API-Interview-Questions-and-Answers-1024x427.png 1024w, https:\/\/internshala.com\/blog\/wp-content\/uploads\/2026\/09\/Top-REST-API-Interview-Questions-and-Answers-672x280.png 672w, https:\/\/internshala.com\/blog\/wp-content\/uploads\/2026\/09\/Top-REST-API-Interview-Questions-and-Answers.png 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-table is-style-regular\"><table class=\"has-pale-cyan-blue-background-color has-background\"><tbody><tr><td><strong>Summary<\/strong>: REST API interview preparation requires understanding HTTP methods, status codes, authentication, authorization, pagination, security, error handling, and API design. Java developers should also know Spring Boot annotations and REST clients. Practice the core concepts with real API examples, test requests using tools such as Postman, and solve scenario-based questions to improve problem-solving skills and confidently explain technical interview questions.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Every day, billions of apps, websites, and online services exchange data within seconds. Whether you check the weather, order food, make an online payment, or book a cab, REST APIs often handle the communication behind the scenes. As a result, REST APIs have become a fundamental part of modern software development and a common topic in technical interviews.<\/p>\n\n\n\n<p>Employers expect candidates to understand how APIs facilitate communication between applications, how HTTP methods are used, and how requests and responses are structured. They may also assess knowledge of authentication, error handling, API security, and best practices for building reliable and scalable services. In this blog, we will cover REST API interview questions ranging from basic concepts to advanced topics.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title ez-toc-toggle\" style=\"cursor:pointer\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/internshala.com\/blog\/rest-api-interview-questions-and-answers\/#What_is_a_REST_API\" >What is a REST API?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/internshala.com\/blog\/rest-api-interview-questions-and-answers\/#Top_50_REST_API_Interview_Questions_and_Answers\" >Top 50 REST API Interview Questions and Answers<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/internshala.com\/blog\/rest-api-interview-questions-and-answers\/#I_Basic_REST_API_Interview_Questions\" >I. Basic REST API Interview Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/internshala.com\/blog\/rest-api-interview-questions-and-answers\/#II_Intermediate-Level_REST_API_Interview_Questions\" >II. Intermediate-Level REST API Interview Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/internshala.com\/blog\/rest-api-interview-questions-and-answers\/#III_Advanced-Level_REST_API_Interview_Questions\" >III. Advanced-Level REST API Interview Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/internshala.com\/blog\/rest-api-interview-questions-and-answers\/#IV_Java_REST_API_Interview_Questions\" >IV. Java REST API Interview Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/internshala.com\/blog\/rest-api-interview-questions-and-answers\/#V_REST_API_Scenario-Based_Interview_Questions\" >V. REST API Scenario-Based Interview Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/internshala.com\/blog\/rest-api-interview-questions-and-answers\/#Conclusion\" >Conclusion<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/internshala.com\/blog\/rest-api-interview-questions-and-answers\/#FAQs\" >FAQs<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_a_REST_API\"><\/span><strong>What is a REST API?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>REST API stands for Representational State Transfer Application Programming Interface. REST is an architectural style for designing web services that allow applications to communicate over HTTP. A REST API enables a client, such as a website or mobile app, to send requests to a server and receive data or perform operations on resources.<\/p>\n\n\n\n<p>REST APIs typically represent resources such as users, products, orders, and payments through URLs. HTTP methods define the operation performed on these resources:<\/p>\n\n\n\n<ul>\n<li><strong>GET:<\/strong> Retrieves a resource.<\/li>\n\n\n\n<li><strong>POST:<\/strong> Creates a new resource.<\/li>\n\n\n\n<li><strong>PUT:<\/strong> Replaces an existing resource.<\/li>\n\n\n\n<li><strong>PATCH:<\/strong> Partially updates a resource.<\/li>\n\n\n\n<li><strong>DELETE:<\/strong> Removes a resource.<\/li>\n<\/ul>\n\n\n\n<p>For example, GET \/products requests a list of products from the server. The server processes the request and returns a response, commonly in JSON format. REST APIs also use HTTP headers, request bodies, and status codes to provide additional information about the request and its result.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large desktop-image\"><a href=\"https:\/\/internshala.com\/?utm_source=is_blog&amp;utm_medium=rest-api-interview-questions-and-answers&amp;utm_campaign=candidate-web-banner\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"203\" src=\"https:\/\/internshala.com\/blog\/wp-content\/uploads\/2024\/10\/Find-and-apply-web-1024x203.jpg\" alt=\"Find and apply web banner\" class=\"wp-image-25333\" srcset=\"https:\/\/internshala.com\/blog\/wp-content\/uploads\/2024\/10\/Find-and-apply-web-1024x203.jpg 1024w, https:\/\/internshala.com\/blog\/wp-content\/uploads\/2024\/10\/Find-and-apply-web-672x133.jpg 672w, https:\/\/internshala.com\/blog\/wp-content\/uploads\/2024\/10\/Find-and-apply-web-1536x305.jpg 1536w, https:\/\/internshala.com\/blog\/wp-content\/uploads\/2024\/10\/Find-and-apply-web-2048x406.jpg 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full mobile-image\"><a href=\"https:\/\/internshala.com\/?utm_source=is_blog&amp;utm_medium=rest-api-interview-questions-and-answers&amp;utm_campaign=candidate-mobile-banner\"><img loading=\"lazy\" decoding=\"async\" width=\"356\" height=\"256\" src=\"https:\/\/internshala.com\/blog\/wp-content\/uploads\/2024\/10\/Find-and-apply-mobile-1.jpg\" alt=\"Find and apply mobile banner\" class=\"wp-image-25334\"\/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Top_50_REST_API_Interview_Questions_and_Answers\"><\/span><strong>Top 50 REST API Interview Questions and Answers<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>REST API interview questions usually include basic concepts, technical knowledge, and practical problem-solving. Whether you are a beginner or an experienced developer, preparing for these questions can help you understand how REST APIs work and improve your confidence during interviews.&nbsp;<\/p>\n\n\n\n<p>Here are REST API interview questions that include basic and intermediate topics, advanced concepts, Java-specific questions, and practical interview scenarios:\u00a0<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><tbody><tr><td><strong>You know?<\/strong> According to IMARC, Open\/Public APIs account for <strong>26.0%<\/strong> of the Indian market, while Machine Learning &amp; AI REST endpoints hold the largest share of overall functionality at <strong>25.0%<\/strong>. Payment APIs contribute <strong>21.3%<\/strong> of market demand.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"I_Basic_REST_API_Interview_Questions\"><\/span><strong>I. Basic REST API Interview Questions<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>If you are preparing for a REST API interview as a beginner, start with questions on the fundamentals. Interviewers commonly test your understanding of REST, APIs, resources, endpoints, HTTP methods, status codes, requests, responses, and JSON. You should be able to explain these concepts clearly and give simple examples.&nbsp;<\/p>\n\n\n\n<p>Here are some basic REST API interview questions for beginners:&nbsp;<\/p>\n\n\n\n<p><strong>1. What is REST?<\/strong><\/p>\n\n\n\n<p>REST stands for Representational State Transfer. It is an architectural style for designing web services that allow applications to communicate over HTTP. RESTful services represent data as resources and use standard HTTP methods to perform operations on those resources.<\/p>\n\n\n\n<p>For example, a REST API may represent users, products, and orders as resources. A client can use methods such as GET, POST, PUT, PATCH, and DELETE to interact with them.<\/p>\n\n\n\n<p><strong>2. What is an API?<\/strong><\/p>\n\n\n\n<p>API stands for Application Programming Interface. It defines how one software application can request data or functionality from another application or service. For example, a weather application can use a weather API to request current weather information. The application sends a request to the API, and the API returns a response containing the requested data.<\/p>\n\n\n\n<p><strong>3. What is an endpoint in a REST API?<\/strong><\/p>\n\n\n\n<p>An endpoint is a specific URL through which a client interacts with a resource provided by an API. An endpoint typically combines a URL path with an HTTP method to define an operation.<\/p>\n\n\n\n<p>For example:<\/p>\n\n\n\n<ul>\n<li>GET \/users retrieves a collection of users.<\/li>\n\n\n\n<li>GET \/users\/123 retrieves the user with ID 123.<\/li>\n\n\n\n<li>POST \/users submits data to create a new user.<\/li>\n\n\n\n<li>DELETE \/users\/123 deletes the user with ID 123.<\/li>\n<\/ul>\n\n\n\n<p>Therefore, an endpoint provides a specific access point for interacting with an API resource.<\/p>\n\n\n\n<p><strong>4. What is a resource in REST?<\/strong><\/p>\n\n\n\n<p>A resource is a piece of data or an entity that an API exposes for clients to access or manipulate. Examples include users, products, orders, and payments.<\/p>\n\n\n\n<p>For example, in an e-commerce API, a product can be represented as a resource:<\/p>\n\n\n\n<p>GET \/products\/101<\/p>\n\n\n\n<p>Here, \/products\/101 identifies the product with ID 101. REST APIs generally use nouns to represent resources rather than action-based URLs.<\/p>\n\n\n\n<p><strong>5. What are HTTP methods in REST APIs?<\/strong><\/p>\n\n\n\n<p>HTTP methods indicate the operation a client wants to perform on a resource. The commonly used methods in REST APIs are:<\/p>\n\n\n\n<ul>\n<li><strong>GET:<\/strong> Retrieves a resource or collection of resources.<\/li>\n\n\n\n<li><strong>POST:<\/strong> Submits data, commonly to create a resource or trigger server-side processing.<\/li>\n\n\n\n<li><strong>PUT:<\/strong> Replaces an existing resource with the supplied representation.<\/li>\n\n\n\n<li><strong>PATCH:<\/strong> Partially updates an existing resource.<\/li>\n\n\n\n<li><strong>DELETE:<\/strong> Removes a resource.<\/li>\n<\/ul>\n\n\n\n<p>For example, GET \/products retrieves products, while POST \/products can submit details for creating a new product.<\/p>\n\n\n\n<p><strong>6. What is the difference between GET and POST?<\/strong><\/p>\n\n\n\n<p>GET and POST are HTTP methods used for different types of operations.<\/p>\n\n\n\n<ul>\n<li>GET requests data from a server. It is generally used for retrieving resources and should not be used to modify server state.<\/li>\n\n\n\n<li>POST submits data to a server. It is commonly used to create a resource or perform an operation that causes a change on the server.<\/li>\n<\/ul>\n\n\n\n<p>For example:<\/p>\n\n\n\n<ul>\n<li>GET \/products retrieves a list of products.<\/li>\n\n\n\n<li>POST \/products submits product details to create a product.<\/li>\n<\/ul>\n\n\n\n<p>Another important difference is that GET parameters are commonly sent through the URL, while POST data is commonly sent in the request body.<\/p>\n\n\n\n<p><strong>7. What is an HTTP status code?<\/strong><\/p>\n\n\n\n<p>An HTTP status code is a three-digit code included in the server&#8217;s response to indicate the result of an HTTP request. Status codes are grouped into five categories:<\/p>\n\n\n\n<ul>\n<li><strong>1xx:<\/strong> Informational responses<\/li>\n\n\n\n<li><strong>2xx:<\/strong> Successful requests<\/li>\n\n\n\n<li><strong>3xx:<\/strong> Redirection<\/li>\n\n\n\n<li><strong>4xx:<\/strong> Client errors<\/li>\n\n\n\n<li><strong>5xx:<\/strong> Server errors<\/li>\n<\/ul>\n\n\n\n<p>Common status codes include:<\/p>\n\n\n\n<ul>\n<li><strong>200 OK:<\/strong> The request was successful.<\/li>\n\n\n\n<li><strong>201 Created:<\/strong> A resource was successfully created.<\/li>\n\n\n\n<li><strong>204 No Content:<\/strong> The request succeeded, but there is no response body.<\/li>\n\n\n\n<li><strong>400 Bad Request:<\/strong> The server cannot process the request because it is invalid.<\/li>\n\n\n\n<li><strong>401 Unauthorized:<\/strong> Authentication is required, or the provided authentication is invalid.<\/li>\n\n\n\n<li><strong>403 Forbidden:<\/strong> The server understood the request but refuses to allow it.<\/li>\n\n\n\n<li><strong>404 Not Found:<\/strong> The requested resource could not be found.<\/li>\n\n\n\n<li><strong>409 Conflict:<\/strong> The request conflicts with the current state of the resource.<\/li>\n\n\n\n<li><strong>429 Too Many Requests:<\/strong> The client has exceeded the allowed request rate.<\/li>\n\n\n\n<li><strong>500 Internal Server Error:<\/strong> The server encountered an unexpected problem.<\/li>\n<\/ul>\n\n\n\n<p><strong>8. What is JSON?<\/strong><\/p>\n\n\n\n<p>JSON stands for JavaScript Object Notation. It is a lightweight, structured data format commonly used to exchange data between clients and REST APIs.&nbsp;<\/p>\n\n\n\n<p>Example:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>{&nbsp;&#8220;name&#8221;: &#8220;John&#8221;,&nbsp;&#8220;age&#8221;: 25,&nbsp;&#8220;email&#8221;: &#8220;john@example.com&#8221;&nbsp;}&nbsp;<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>REST APIs commonly use JSON for request and response bodies because it provides a standard, language-independent way to represent structured data.&nbsp;<\/p>\n\n\n\n<p><strong>9. What is an HTTP request?<\/strong><\/p>\n\n\n\n<p>An HTTP request is a message sent by a client to a server to request data or perform an operation. An HTTP request can contain several components, including:<\/p>\n\n\n\n<ul>\n<li><strong>Method:<\/strong> Specifies the operation, such as GET or POST.<\/li>\n\n\n\n<li><strong>URL:<\/strong> Identifies the API endpoint.<\/li>\n\n\n\n<li><strong>Headers:<\/strong> Provide additional information, such as authentication credentials or the content type.<\/li>\n\n\n\n<li><strong>Request Body:<\/strong> Contains data sent to the server, when required.<\/li>\n<\/ul>\n\n\n\n<p>For example, a client might send a POST \/users request with user information in the request body to create a new user.<\/p>\n\n\n\n<p><strong>10. What is an HTTP response?<\/strong><\/p>\n\n\n\n<p>An HTTP response is the message a server sends back to the client after processing an HTTP request. It generally contains a status code, headers, and, when applicable, a response body.<\/p>\n\n\n\n<p>For example, after receiving GET \/products\/101, the server may return a 200 OK status and a JSON response containing the product details. If the requested product does not exist, the server may instead return a 404 Not Found response.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"II_Intermediate-Level_REST_API_Interview_Questions\"><\/span><strong>II. Intermediate-Level REST API Interview Questions<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Once you understand the basics, move on to intermediate REST API interview questions. These questions test whether you can apply REST concepts when designing and consuming APIs. Interviewers commonly ask about statelessness, HTTP headers, authentication and authorization, idempotency, API versioning, parameters, and update methods.&nbsp;<\/p>\n\n\n\n<p>Here are the top 10 intermediate-level interview questions and answers:&nbsp;<\/p>\n\n\n\n<p><strong>11. What does stateless mean in REST?<\/strong><\/p>\n\n\n\n<p>A REST API is stateless, which means the server does not rely on stored client session information from previous requests to process a new request. Each request must contain the information the server needs to understand and process it.<\/p>\n\n\n\n<p>For example, if a client requests a user&#8217;s profile, the request may include an access token to identify the user. The server validates the token and processes the request without depending on information stored from an earlier request.<\/p>\n\n\n\n<p>Statelessness can provide:<\/p>\n\n\n\n<ul>\n<li><strong>Scalability:<\/strong> Requests can be handled by different server instances without relying on a specific server&#8217;s session state.<\/li>\n\n\n\n<li><strong>Simpler Server Management:<\/strong> The server does not need to maintain client session state between requests.<\/li>\n\n\n\n<li><strong>Improved Reliability:<\/strong> Each request can be processed independently.<\/li>\n<\/ul>\n\n\n\n<p><strong>12. What are HTTP headers?<\/strong><\/p>\n\n\n\n<p>HTTP headers are key-value pairs included in HTTP requests and responses. They provide additional information about the request or response, such as the data format, authentication credentials, caching rules, and client information.<\/p>\n\n\n\n<p>The common HTTP headers include:<\/p>\n\n\n\n<ul>\n<li><strong>Content-Type: <\/strong>Specifies the format of the request or response body, application\/json.<\/li>\n\n\n\n<li><strong>Authorization:<\/strong> Carries authentication credentials, such as a bearer token.<\/li>\n\n\n\n<li><strong>Accept:<\/strong> Indicates the response formats the client can process.<\/li>\n\n\n\n<li><strong>Cache-Control:<\/strong> Specifies caching requirements.<\/li>\n\n\n\n<li><strong>User-Agent:<\/strong> Identifies the software or client making the request.<\/li>\n<\/ul>\n\n\n\n<p><strong>13. What is authentication?<\/strong><\/p>\n\n\n\n<p>Authentication is the process of verifying the identity of a user or application. It answers the question, \u2018Who are you?\u2019<\/p>\n\n\n\n<p>For example, when you log in with your email address and password, the server verifies your credentials. If they are valid, the server may issue an authentication token that the client can use in subsequent API requests.<\/p>\n\n\n\n<p>Common authentication methods include:<\/p>\n\n\n\n<ul>\n<li>Username and password<\/li>\n\n\n\n<li>API keys<\/li>\n\n\n\n<li>Bearer tokens<\/li>\n\n\n\n<li>OAuth<\/li>\n<\/ul>\n\n\n\n<p><strong>14. What is authorization?<\/strong><\/p>\n\n\n\n<p>Authorization determines what an authenticated user or application is allowed to access or do. After verifying the identity of the requester, the system checks their permissions for specific resources, features, or actions. In simple terms, authorization answers the question, \u2018What can you access or do?\u2019<\/p>\n\n\n\n<p>For example:<\/p>\n\n\n\n<ul>\n<li>An admin can create, update, and delete user accounts.<\/li>\n\n\n\n<li>A regular user can view and edit only their own profile.<\/li>\n<\/ul>\n\n\n\n<p>Authentication and authorization are related but different. Authentication verifies identity, while authorization determines permissions.<\/p>\n\n\n\n<p><strong>15. What is an API request?<\/strong><\/p>\n\n\n\n<p>An API request is a message sent by a client to a server to retrieve information or perform an action. It contains the information the server needs to process the request.<\/p>\n\n\n\n<p>An API request may include:<\/p>\n\n\n\n<ul>\n<li>An endpoint<\/li>\n\n\n\n<li>An HTTP method, such as GET or POST<\/li>\n\n\n\n<li>Headers<\/li>\n\n\n\n<li>A request body, when required<\/li>\n\n\n\n<li>Query parameters or path parameters, when needed<\/li>\n<\/ul>\n\n\n\n<p>For example, a GET request to \/users\/1 asks the server to return information about the user with ID 1.<\/p>\n\n\n\n<p><strong>16. What is an API response?<\/strong><\/p>\n\n\n\n<p>An API response is the message a server sends back after processing an API request. It indicates whether the request was successful and may contain the requested data or details about an error.<\/p>\n\n\n\n<p>An API response usually includes:<\/p>\n\n\n\n<ul>\n<li>A status code, such as 200 OK or 404 Not Found<\/li>\n\n\n\n<li>Response headers<\/li>\n\n\n\n<li>A response body containing data or error details<\/li>\n<\/ul>\n\n\n\n<p>For example, if a client requests information about a user, the server may return a JSON response such as:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>{&nbsp;&nbsp;&#8220;id&#8221;: 1,&nbsp;&nbsp;&#8220;name&#8221;: &#8220;John Doe&#8221;,&nbsp;&nbsp;&#8220;email&#8221;: &#8220;john@example.com&#8221;}<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>The client can then use this data to display the requested information or perform another action.&nbsp;<\/p>\n\n\n\n<p><strong>17. What is the difference between PUT and PATCH?<\/strong><\/p>\n\n\n\n<p>Both PUT and PATCH are HTTP methods used to modify existing resources, but they differ in how the update is applied.<\/p>\n\n\n\n<ul>\n<li><strong>PUT<\/strong> is generally used to replace the current representation of a resource with the representation provided in the request.<\/li>\n\n\n\n<li><strong>PATCH<\/strong> is used to apply partial modifications to a resource.<\/li>\n<\/ul>\n\n\n\n<p>For example, suppose a user resource contains a name, email, and phone number:<\/p>\n\n\n\n<ul>\n<li>A PUT request may provide the complete updated user representation.<\/li>\n\n\n\n<li>A PATCH request can provide only the phone number that needs to be changed, leaving the other fields unchanged.<\/li>\n<\/ul>\n\n\n\n<p>Therefore, PATCH is useful when only specific parts of a resource need to be updated, while PUT is generally used when the client wants to replace the resource representation.<\/p>\n\n\n\n<p><strong>18. Why are REST APIs widely used?<\/strong><\/p>\n\n\n\n<p>REST APIs are widely used because they provide a simple, standardized, and flexible way for different applications and systems to communicate. They use standard HTTP methods and can work across websites, mobile applications, cloud services, and other platforms. REST APIs are also generally easy to develop, scale, and integrate with different technologies.&nbsp;<\/p>\n\n\n\n<p><strong>19. Can a REST API return different types of data?<\/strong><\/p>\n\n\n\n<p>Yes. A REST API can return data in different formats, depending on what the API supports and what the client requests. JSON (JavaScript Object Notation) is the most commonly used format because it is lightweight, human-readable, and supported by most programming languages. APIs may also return XML, plain text, HTML, or other formats when required.&nbsp;<\/p>\n\n\n\n<p><strong>20. Why should REST APIs use clear and meaningful URLs?<\/strong><\/p>\n\n\n\n<p>Clear and meaningful URLs make an API easier to understand, use, and maintain. They help developers identify the resource represented by an endpoint without relying heavily on additional documentation. RESTful URLs typically use nouns to represent resources rather than actions.<\/p>\n\n\n\n<p>For example, \u2018\/products\u2019 clearly represents a collection of products, while \u2018\/getData123\u2019 does not clearly indicate what resource the endpoint provides. Using descriptive and consistent URLs also improves API readability and makes it easier for developers to work with the API.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"III_Advanced-Level_REST_API_Interview_Questions\"><\/span><strong>III. Advanced-Level REST API Interview Questions<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Advanced REST API interview questions test your understanding of security, performance, caching, rate limiting, HTTP status codes, and API design practices. Interviewers often ask these questions to assess your ability to build APIs that are secure, scalable, reliable, and easy to maintain.&nbsp;<\/p>\n\n\n\n<p>Here are some advanced-level REST API interview questions and answers:&nbsp;&nbsp;<\/p>\n\n\n\n<p><strong>21. How can you secure a REST API?<\/strong><\/p>\n\n\n\n<p>You can secure a REST API by preventing unauthorized access, protecting data during transmission, and validating requests before processing them. Some common ways to secure a REST API include:<\/p>\n\n\n\n<ul>\n<li>Use HTTPS to encrypt data transmitted between the client and server.<\/li>\n\n\n\n<li>Use secure authentication methods, such as API keys, bearer tokens, or OAuth, as appropriate.<\/li>\n\n\n\n<li>Apply authorization checks to ensure users or applications can access only permitted resources and actions.<\/li>\n\n\n\n<li>Validate and sanitize client-provided input.<\/li>\n\n\n\n<li>Apply rate limiting to control excessive requests.<\/li>\n\n\n\n<li>Avoid exposing sensitive information in API responses and error messages.<\/li>\n<\/ul>\n\n\n\n<p>These measures work together to reduce security risks and protect both the API and its users.<\/p>\n\n\n\n<p><strong>22. What is HTTPS? Why is it important for APIs?<\/strong><\/p>\n\n\n\n<p>HTTPS (Hypertext Transfer Protocol Secure) is the secure version of HTTP. It uses TLS (Transport Layer Security) to encrypt data exchanged between the client and server.<\/p>\n\n\n\n<p>This encryption helps prevent attackers from intercepting or modifying sensitive information, such as passwords, payment details, authentication tokens, and personal data, while it is being transmitted. Using HTTPS is a fundamental security requirement for modern APIs.<\/p>\n\n\n\n<p><strong>23. What is rate limiting?<\/strong><\/p>\n\n\n\n<p>Rate limiting controls the number of API requests a client can make within a specified time period. For example, an API may allow a client to make 100 requests per minute.<\/p>\n\n\n\n<p>Rate limiting helps protect server resources, maintain performance during high traffic, and reduce abuse from bots or automated clients. It can also help mitigate certain types of excessive or malicious traffic, although dedicated DoS\/DDoS protection may be needed for larger attacks.<\/p>\n\n\n\n<p>When a client exceeds the configured limit, the API commonly returns a 429 Too Many Requests status code.<\/p>\n\n\n\n<p><strong>24. What is caching in REST APIs?<\/strong><\/p>\n\n\n\n<p>Caching is the process of temporarily storing a copy of an API response so that subsequent requests for the same data can be served more efficiently.<\/p>\n\n\n\n<p>For example, if product information does not change frequently, a cached response can be returned instead of generating the same response for every request. This can reduce response time, network traffic, and server workload.<\/p>\n\n\n\n<p>HTTP caching can be controlled using mechanisms such as Cache-Control, ETag, and Last-Modified headers, depending on the API&#8217;s requirements.<\/p>\n\n\n\n<p><strong>Pro Tip<\/strong>: Avoid caching frequently changing or sensitive data, and consider how long the cached response should remain valid. For more related REST API interview questions, explore the <a href=\"https:\/\/internshala.com\/blog\/backend-developer-interview-questions\/?utm_source=is_blog&amp;utm_medium=rest-api-interview-questions-and-answers&amp;utm_campaign=candidate-blog-detail\">backend developer interview questions<\/a>.<\/p>\n\n\n\n<p><strong>25. What is the difference between 401 and 403?<\/strong><\/p>\n\n\n\n<p>A 401 Unauthorized response indicates that the request does not contain valid authentication credentials. This can happen when authentication credentials are missing, invalid, or expired. The client may be able to access the resource after providing valid credentials.<\/p>\n\n\n\n<p>A 403 Forbidden response means that the server understands who or what is making the request, but the requester does not have sufficient permission to access the requested resource or perform the requested action.<\/p>\n\n\n\n<p>In simple terms:<\/p>\n\n\n\n<ul>\n<li><strong>401:<\/strong> Authentication is missing or invalid.<\/li>\n\n\n\n<li><strong>403:<\/strong> Authentication may be valid, but access is not permitted.<\/li>\n<\/ul>\n\n\n\n<p><strong>26. What is the difference between 404 and 405?<\/strong><\/p>\n\n\n\n<p>A 404 Not Found response indicates that the server cannot find the requested resource. This can happen when the requested path does not exist or when a specified resource, such as a user or product ID, cannot be found.<\/p>\n\n\n\n<p>A 405 Method Not Allowed response means that the requested resource exists, but the HTTP method used by the client is not supported for that resource.<\/p>\n\n\n\n<p>For example, if an endpoint supports only GET requests, sending a DELETE request to that endpoint may result in a 405 Method Not Allowed response.<\/p>\n\n\n\n<p><strong>27. Why is input validation important in a REST API?<\/strong><\/p>\n\n\n\n<p>Input validation checks whether data sent by a client meets the API&#8217;s expected format, type, and business rules before the server processes it. For example, if an API expects an email address, it should validate the input and reject an invalid value rather than storing incorrect data.<\/p>\n\n\n\n<p>Input validation helps prevent invalid data, reduce application errors, and protect the API from potentially harmful or unexpected input. Validation should be performed on the server because client-side validation alone cannot be trusted.<\/p>\n\n\n\n<p><strong>28. Why should a REST API return meaningful error messages?<\/strong><\/p>\n\n\n\n<p>Meaningful and well-structured error responses help clients understand why a request failed and determine how to resolve the problem. For example, instead of returning only a generic error, an API might return an appropriate status code along with structured information such as the following:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>{&nbsp;&#8220;error&#8221;: &#8220;validation_error&#8221;,&nbsp;&#8220;message&#8221;: &#8220;Email address is required.&#8221;&nbsp;}&nbsp;<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Clear error responses make APIs easier to integrate, troubleshoot, and maintain. However, error messages should not expose sensitive information such as passwords, internal system details, or database information.&nbsp;<\/p>\n\n\n\n<p><strong>29. Why should sensitive data be protected in a REST API?<\/strong><\/p>\n\n\n\n<p>Sensitive data, such as passwords, payment details, authentication tokens, and personal information, should be protected to prevent unauthorized access and data exposure. Protecting sensitive data helps reduce security risks and safeguards user privacy.<\/p>\n\n\n\n<p>REST APIs should follow practices such as the following:<\/p>\n\n\n\n<ul>\n<li>Use HTTPS to protect data during transmission.<\/li>\n\n\n\n<li>Return only the data the client actually needs.<\/li>\n\n\n\n<li>Never expose passwords or other confidential credentials in API responses.<\/li>\n\n\n\n<li>Avoid storing or exposing sensitive information unnecessarily in logs.<\/li>\n\n\n\n<li>Apply appropriate authentication and authorization controls.<\/li>\n<\/ul>\n\n\n\n<p><strong>30. Why is API documentation important?<\/strong><\/p>\n\n\n\n<p>API documentation explains how an API works and how developers should interact with it. Good documentation typically describes available endpoints, HTTP methods, authentication requirements, request parameters, request and response formats, status codes, and common error responses. It may also include example requests and responses to show developers how to use the API correctly.<\/p>\n\n\n\n<p>Up-to-date documentation makes API integration easier, reduces development errors, and helps developers troubleshoot problems without relying on the API&#8217;s development team for every question.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"IV_Java_REST_API_Interview_Questions\"><\/span><strong>IV. Java REST API Interview Questions<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>If you are applying for Java developer roles, you should also prepare for Java REST API interview questions. A common approach to building REST APIs in Java is to use Spring Boot, which simplifies application configuration and provides tools for developing web applications and RESTful services. These questions cover commonly used Spring annotations, request handling, and response management.&nbsp;<\/p>\n\n\n\n<p><strong>31. How do you create a REST API in Java?<\/strong><\/p>\n\n\n\n<p>A common way to create a REST API in Java is by using Spring Boot. Spring Boot simplifies the development of web applications by providing auto-configuration, embedded servers, and other features that reduce the amount of setup required.<\/p>\n\n\n\n<p>To create a REST API, you typically:<\/p>\n\n\n\n<ul>\n<li>Create a Spring Boot project with the required web dependencies.<\/li>\n\n\n\n<li>Create a controller class to handle HTTP requests.<\/li>\n\n\n\n<li>Define endpoints using annotations such as @GetMapping, @PostMapping, @PutMapping, or @DeleteMapping.<\/li>\n\n\n\n<li>Add the required service and data-access logic.<\/li>\n\n\n\n<li>Run the application so clients can send requests to the API.<\/li>\n<\/ul>\n\n\n\n<p><strong>32. What is @RestController in Spring Boot?<\/strong><\/p>\n\n\n\n<p>@RestControlleris a Spring Framework annotation used to create RESTful web controllers. It indicates that a class handles HTTP requests and that the return value of its handler methods should be written directly to the HTTP response body.<\/p>\n\n\n\n<p>It is effectively a combination of @Controller and @ResponseBody. When an object is returned, Spring can use an HTTP message converter to serialize it into a format such as JSON.<\/p>\n\n\n\n<p><strong>33. What is @GetMapping?<\/strong><\/p>\n\n\n\n<p>@GetMapping is a Spring annotation used to map an HTTP GET request to a specific Java method. GET requests are commonly used to retrieve resources or data from a server.<\/p>\n\n\n\n<p>For example, a method mapped to \/users using @GetMapping can return a list of users when a client sends a GET request to that path.<\/p>\n\n\n\n<p><strong>34. What is @PostMapping?<\/strong><\/p>\n\n\n\n<p>@PostMapping is a Spring annotation used to map HTTP POST requests to a Java method. POST requests are commonly used to submit data to the server, including creating a new resource.<\/p>\n\n\n\n<p>For example, an endpoint such as \/users can use @PostMapping to receive the details of a new user and create the corresponding resource.<\/p>\n\n\n\n<p><strong>35. What is @RequestBody?<\/strong><\/p>\n\n\n\n<p>@RequestBody is a Spring annotation used to bind the body of an HTTP request to a Java method parameter. Spring uses HTTP message converters to deserialize the request data into the specified Java object. It is commonly used with POST, PUT, and PATCH requests when the client sends structured data such as JSON.<\/p>\n\n\n\n<p><strong>36. What is @PathVariable?<\/strong><\/p>\n\n\n\n<p>@PathVariable is a Spring annotation used to extract a value from a URL path and pass it to a Java method as a parameter. For example, in the URL \/users\/10, the value 10 can be extracted using @PathVariable and used to identify the user whose details are being requested.<\/p>\n\n\n\n<p><strong>37. What is @RequestParam?<\/strong><\/p>\n\n\n\n<p>@RequestParam is a Spring annotation used to retrieve values from query parameters in a URL. Query parameters are commonly used for filtering, searching, sorting, pagination, or other optional request criteria. For example, in the URL \/users?department=HR, the value HR can be retrieved using @RequestParam.<\/p>\n\n\n\n<p><strong>38. What is the difference between @PathVariable and @RequestParam?<\/strong><\/p>\n\n\n\n<p>@PathVariable extracts values from the URL path, while @RequestParam retrieves values from the query string.<\/p>\n\n\n\n<p>@PathVariable is typically used to identify a specific resource, whereas @RequestParam is commonly used for additional request criteria such as filtering, searching, sorting, or pagination.<\/p>\n\n\n\n<p>For example:<\/p>\n\n\n\n<ul>\n<li>\/users\/10 \u2192 10 can be retrieved using @PathVariable.<\/li>\n\n\n\n<li>\/users?department=HR \u2192 HR can be retrieved using @RequestParam.<\/li>\n<\/ul>\n\n\n\n<p>Query parameters can be either required or optional depending on how they are configured.<\/p>\n\n\n\n<p><strong>39. What is ResponseEntity in Spring Boot?<\/strong><\/p>\n\n\n\n<p>ResponseEntity is a Spring Framework class that gives you control over the HTTP response returned by a controller. It allows you to specify the response body, HTTP status code, and HTTP headers.<\/p>\n\n\n\n<p>For example, a controller can return a 200 OK response when a resource is found or a 404 Not Found response when the requested resource does not exist.<\/p>\n\n\n\n<p><strong>40. What is the difference between @Controller and @RestController?<\/strong><\/p>\n\n\n\n<p>@Controller is commonly used for Spring MVC applications where controller methods return views, such as HTML pages. @RestController is designed for REST APIs, where method return values are written directly to the HTTP response body.<\/p>\n\n\n\n<p>@RestController combines @Controller and @ResponseBody, making it convenient for APIs that return data such as JSON.<\/p>\n\n\n\n<p>However, @Controller can also return data directly when @ResponseBody is used on a method or class. Therefore, the key difference is how Spring treats the controller&#8217;s return values by default.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"V_REST_API_Scenario-Based_Interview_Questions\"><\/span><strong>V. REST API Scenario-Based Interview Questions<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Scenario-based REST API interview questions test how you apply REST API concepts to real situations. Instead of asking for definitions, interviewers present a problem and expect you to explain how you would solve it. Practicing these questions can help you improve your problem-solving and communication skills during interviews.&nbsp;<\/p>\n\n\n\n<p>Here are some scenario-based questions to practice with:&nbsp;<\/p>\n\n\n\n<p><strong>41. A user sends invalid data to your API. What would you do?<\/strong><\/p>\n\n\n\n<p>I would validate the incoming data before processing it. If the data is missing required fields, contains invalid values, or has the wrong format, I would return a 400 Bad Request response with a clear error message explaining what needs to be corrected. This helps the client fix the request and prevents invalid data from being stored.<\/p>\n\n\n\n<p><strong>42. Your API is returning 500 errors. How would you investigate?<\/strong><\/p>\n\n\n\n<p>I would first check the application logs to identify the error. Then, I would review recent code changes, verify database connectivity, inspect server logs, and reproduce the issue if possible. I would also add proper exception handling to return meaningful error responses while logging the full error details for debugging.<\/p>\n\n\n\n<p><strong>43. Your API has thousands of records and is becoming slow. What would you do?<\/strong><\/p>\n\n\n\n<p>I would improve performance by implementing pagination so the API returns data in smaller batches instead of all records at once. I would also optimize database queries, add indexes where needed, enable caching for frequently requested data, and monitor the application&#8217;s performance to identify bottlenecks.<\/p>\n\n\n\n<p><strong>44. A client sends the wrong HTTP method. What should the API return?<\/strong><\/p>\n\n\n\n<p>The API should return a 405 Method Not Allowed status code. This indicates that the requested resource exists, but the HTTP method used is not supported for that endpoint. For example, sending a POST request to an endpoint that only accepts GET requests should result in a 405 response.<\/p>\n\n\n\n<p><strong>45. A user is logged in but cannot access an admin API. What could be wrong?<\/strong><\/p>\n\n\n\n<p>The user may be authenticated but does not have the required permissions or role to access the admin endpoint. This is an authorization issue, and the API should typically return a 403 Forbidden status code. I would check the user&#8217;s assigned roles, access permissions, and the API&#8217;s authorization rules.<\/p>\n\n\n\n<p><strong>46. Your frontend works locally, but the API fails in the browser after deployment. What would you check?<\/strong><\/p>\n\n\n\n<p>I would first check whether Cross-Origin Resource Sharing (CORS) is configured correctly, as browsers block requests from unauthorized origins. I would also verify the API URL, confirm the server is running, check SSL\/HTTPS configuration, inspect browser developer tools for network errors, and review server logs to identify the root cause.<\/p>\n\n\n\n<p><strong>47. Your API returns data successfully, but the response is taking several seconds. How would you improve performance?<\/strong><\/p>\n\n\n\n<p>I would identify the bottleneck by checking application logs, monitoring database queries, and measuring response times. I would optimize slow queries, add database indexes, use caching for frequently requested data, enable pagination where appropriate, and reduce the amount of unnecessary data returned in the response.<\/p>\n\n\n\n<p><strong>48. A client reports that requests to your API sometimes fail with a 429 status code. What does this mean?<\/strong><\/p>\n\n\n\n<p>A 429 Too Many Requests status code means the client has exceeded the API&#8217;s rate limit. I would check the configured rate limits, confirm whether the client is sending too many requests in a short period, and recommend reducing the request frequency or implementing retries with appropriate delays.<\/p>\n\n\n\n<p><strong>49. You release a new version of your API, but existing applications stop working. How would you prevent this?<\/strong><\/p>\n\n\n\n<p>I would use API versioning so older applications can continue using the previous version while new clients adopt the updated version. I would also avoid breaking changes whenever possible, document new versions clearly, and give clients enough time to migrate before removing older versions.<\/p>\n\n\n\n<p><strong>50. A client says your API sometimes returns different results for the same request. What would you check?<\/strong><\/p>\n\n\n\n<p>I would verify whether the underlying data has changed, review caching behavior, inspect database consistency, and check for issues such as race conditions or load balancing between servers. I would also review application logs to determine whether the requests were processed consistently and identify the source of the inconsistent responses.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large desktop-image\"><a href=\"https:\/\/internshala.com\/?utm_source=is_blog&amp;utm_medium=rest-api-interview-questions-and-answers&amp;utm_campaign=candidate-web-banner\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"203\" src=\"https:\/\/internshala.com\/blog\/wp-content\/uploads\/2024\/10\/Find-and-apply-web-1024x203.jpg\" alt=\"Find and apply web banner\" class=\"wp-image-25333\" srcset=\"https:\/\/internshala.com\/blog\/wp-content\/uploads\/2024\/10\/Find-and-apply-web-1024x203.jpg 1024w, https:\/\/internshala.com\/blog\/wp-content\/uploads\/2024\/10\/Find-and-apply-web-672x133.jpg 672w, https:\/\/internshala.com\/blog\/wp-content\/uploads\/2024\/10\/Find-and-apply-web-1536x305.jpg 1536w, https:\/\/internshala.com\/blog\/wp-content\/uploads\/2024\/10\/Find-and-apply-web-2048x406.jpg 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full mobile-image\"><a href=\"https:\/\/internshala.com\/?utm_source=is_blog&amp;utm_medium=rest-api-interview-questions-and-answers&amp;utm_campaign=candidate-mobile-banner\"><img loading=\"lazy\" decoding=\"async\" width=\"356\" height=\"256\" src=\"https:\/\/internshala.com\/blog\/wp-content\/uploads\/2024\/10\/Find-and-apply-mobile-1.jpg\" alt=\"Find and apply mobile banner\" class=\"wp-image-25334\"\/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span><strong>Conclusion<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>A strong understanding of REST APIs can help you handle both technical questions and practical problems during an interview. Preparing with relevant REST API interview questions will enable you to understand concepts instead of simply memorizing definitions. Focus on how HTTP methods, status codes, authentication, error handling, and API design work together.&nbsp;<\/p>\n\n\n\n<p>If you are preparing for Java roles, practice building services with Spring Boot and understand its important annotations. You should also test APIs, study common errors, and practice explaining your decisions clearly. Finally, revise key topics before your interview to identify weak areas, strengthen your knowledge, and improve confidence.<\/p>\n\n\n\n<p>If you want to become a backend developer, learning REST APIs is only one part of the process. Check out the <a href=\"https:\/\/trainings.internshala.com\/blog\/java-roadmap\/?utm_source=is_blog&amp;utm_medium=rest-api-interview-questions-and-answers&amp;utm_campaign=candidate-blog-detail\">Java Developer Roadmap<\/a> to understand the skills, tools, frameworks, and learning path you need to build a successful career as a Java developer.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"FAQs\"><\/span>FAQs<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1788288929881\"><strong class=\"schema-faq-question\">Q1. What are the most important REST API topics for an interview?<\/strong> <p class=\"schema-faq-answer\"><strong>Answer:<\/strong> The most important REST API topics include HTTP methods (GET, POST, PUT, PATCH, and DELETE), status codes, request and response structure, authentication, authorization, REST principles, JSON, API security, error handling, caching, and common Spring Boot annotations if you are applying for Java developer roles.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1788288930796\"><strong class=\"schema-faq-question\">Q2. Are REST APIs difficult for beginners?<\/strong> <p class=\"schema-faq-answer\"><strong>Answer:<\/strong> No. REST APIs are beginner-friendly once you understand the basics of HTTP and how clients and servers communicate. Start by learning HTTP methods, status codes, and JSON, then practice creating and testing APIs using tools such as Postman and frameworks like Spring Boot.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1788288931382\"><strong class=\"schema-faq-question\">Q3. What is the difference between REST and REST API?<\/strong> <p class=\"schema-faq-answer\"><strong>Answer:<\/strong> REST is an architectural style that defines a set of principles for designing web services. A REST API is an API built by following those REST principles. In simple terms, REST provides the guidelines, while a REST API is the actual implementation of those guidelines.<\/p> <\/div> <\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Sources<\/h3>\n\n\n\n<ul>\n<li>https:\/\/www.imarcgroup.com\/india-api-market<\/li>\n<\/ul>\n<aside class=\"mashsb-container mashsb-main \"><div class=\"mashsb-box\"><div class=\"mashsb-count mash-medium\" style=\"float:left\"><div class=\"counts mashsbcount\">0<\/div><span class=\"mashsb-sharetext\">SHARES<\/span><\/div><div class=\"mashsb-buttons\"><a class=\"mashicon-facebook mash-medium mashsb-noshadow\" href=\"https:\/\/www.facebook.com\/sharer.php?u=https%3A%2F%2Finternshala.com%2Fblog%2Frest-api-interview-questions-and-answers%2F\" target=\"_top\" rel=\"nofollow\"><span class=\"icon\"><\/span><span class=\"text\">Share&nbsp;on&nbsp;Facebook<\/span><\/a><a class=\"mashicon-subscribe mash-medium mashsb-noshadow\" href=\"#\" target=\"_top\" rel=\"nofollow\"><span class=\"icon\"><\/span><span class=\"text\">Get&nbsp;Your&nbsp;Dream&nbsp;Internship<\/span><\/a><div class=\"onoffswitch2 mash-medium mashsb-noshadow\" style=\"display:none\"><\/div><\/div>\n            <\/div>\n                <div style=\"clear:both\"><\/div><\/aside>\n            <!-- Share buttons by mashshare.net - Version: 4.0.42-->","protected":false},"excerpt":{"rendered":"<p>Summary: REST API interview preparation requires understanding HTTP methods, status codes, authentication, authorization, pagination, security, error handling, and API design. Java developers should also know Spring Boot annotations and REST<\/p>\n","protected":false},"author":6510,"featured_media":30255,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[4316,4313],"tags":[10417],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>REST API Interview Questions: 50 Questions &amp; Answers for 2026<\/title>\n<meta name=\"description\" content=\"Explore 50 REST API interview questions &amp; answers for freshers, intermediate &amp; experienced-level professionals, including scenario-based questions.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/internshala.com\/blog\/rest-api-interview-questions-and-answers\/\" \/>\n<meta property=\"og:locale\" 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