{"id":4484,"date":"2025-04-08T16:51:27","date_gmt":"2025-04-08T11:21:27","guid":{"rendered":"https:\/\/www.testleaf.com\/blog\/?p=4484"},"modified":"2025-08-25T17:25:09","modified_gmt":"2025-08-25T11:55:09","slug":"how-to-prepare-for-your-rest-api-interview","status":"publish","type":"post","link":"https:\/\/www.testleaf.com\/blog\/how-to-prepare-for-your-rest-api-interview\/","title":{"rendered":"How to Prepare for Your REST API Interview"},"content":{"rendered":"<div style=\"margin-top: 0px; margin-bottom: 0px;\" class=\"sharethis-inline-share-buttons\" ><\/div><!--[if lt IE 9]><script>document.createElement('audio');<\/script><![endif]-->\n<audio class=\"wp-audio-shortcode\" id=\"audio-4484-1\" preload=\"none\" style=\"width: 100%;\" controls=\"controls\"><source type=\"audio\/ogg\" src=\"https:\/\/www.testleaf.com\/blog\/wp-content\/uploads\/2025\/04\/How-to-Prepare-for-Your-REST-API-Interview.ogg?_=1\" \/><a href=\"https:\/\/www.testleaf.com\/blog\/wp-content\/uploads\/2025\/04\/How-to-Prepare-for-Your-REST-API-Interview.ogg\">https:\/\/www.testleaf.com\/blog\/wp-content\/uploads\/2025\/04\/How-to-Prepare-for-Your-REST-API-Interview.ogg<\/a><\/audio>\n<h2><\/h2>\n<h2><span class=\"ez-toc-section\" id=\"Introduction\"><\/span><strong>Introduction<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 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\" style=\"cursor:inherit\">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 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.testleaf.com\/blog\/how-to-prepare-for-your-rest-api-interview\/#Introduction\" >Introduction<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.testleaf.com\/blog\/how-to-prepare-for-your-rest-api-interview\/#_1_Core_Concepts_to_Master\" >\u00a01. Core Concepts to Master<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.testleaf.com\/blog\/how-to-prepare-for-your-rest-api-interview\/#_2_HTTP_Status_Codes_%E2%80%93_Master_These\" >\u00a02. HTTP Status Codes &#8211; Master These<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.testleaf.com\/blog\/how-to-prepare-for-your-rest-api-interview\/#_3_Hands-On_Tools_You_Must_Know\" >\u00a03. Hands-On Tools You Must Know<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.testleaf.com\/blog\/how-to-prepare-for-your-rest-api-interview\/#_4_Authentication_Authorization_Types\" >\u00a04. Authentication &amp; Authorization Types<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.testleaf.com\/blog\/how-to-prepare-for-your-rest-api-interview\/#_5_JSON_XML_Essentials\" >\u00a05. JSON &amp; XML Essentials<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.testleaf.com\/blog\/how-to-prepare-for-your-rest-api-interview\/#6_Practical_Test_Scenarios\" >6. Practical Test Scenarios<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.testleaf.com\/blog\/how-to-prepare-for-your-rest-api-interview\/#_7_Common_REST_API_Interview_Questions\" >\u00a07. Common 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-9\" href=\"https:\/\/www.testleaf.com\/blog\/how-to-prepare-for-your-rest-api-interview\/#_8_Automation_Real-World_Strategy\" >\u00a08. Automation &amp; Real-World Strategy<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.testleaf.com\/blog\/how-to-prepare-for-your-rest-api-interview\/#9_Bonus_Tips\" >9. Bonus Tips<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.testleaf.com\/blog\/how-to-prepare-for-your-rest-api-interview\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n\n<p>In today\u2019s fast-paced tech ecosystem, REST APIs (Representational State Transfer) have become a critical component for enabling communication between client and server. Whether you are applying for an SDET, backend developer, QA automation engineer, or <a href=\"https:\/\/www.testleaf.com\/course\/full-stack-developer-certification-training-course.html\">full-stack developer<\/a> role, API knowledge is a <em>must-have skill<\/em>.<\/p>\n<p>Companies look for professionals who can validate APIs effectively, understand how they work, and ensure reliability, performance, and security. This guide is your complete roadmap to help you prepare with confidence\u2014covering both theory and hands-on skills.<\/p>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"_1_Core_Concepts_to_Master\"><\/span><strong>\u00a01. Core Concepts to Master<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><strong>What is a REST API?<\/strong><\/h3>\n<ul>\n<li>REST is an architectural style for building web services.<\/li>\n<li>It uses standard HTTP methods and is stateless.<\/li>\n<li>Resources are identified using URIs, and operations are performed using HTTP verbs.<\/li>\n<\/ul>\n<h3><strong>Key REST Principles:<\/strong><\/h3>\n<ul>\n<li><strong>Statelessness:<\/strong> Each API call is independent; server doesn\u2019t store client context.<\/li>\n<li><strong>Client-Server Separation:<\/strong> Frontend and backend are separate.<\/li>\n<li><strong>Uniform Interface:<\/strong> Standard conventions for accessing resources.<\/li>\n<li><strong>Cacheable:<\/strong> Responses should indicate whether they can be cached.<\/li>\n<li><strong>Layered System:<\/strong> API might interact with other systems through layers.<\/li>\n<\/ul>\n<p><strong>Other Helpful Articles : <\/strong><a href=\"https:\/\/www.testleaf.com\/blog\/top-60-api-testing-interview-questions-for-fresher-to-experience-2025\/\">Top 60+ API Testing Interview Questions for Fresher to Experience 2025<\/a><\/p>\n<h3><strong>HTTP Methods Explained:<\/strong><\/h3>\n<ul>\n<li><strong>GET:<\/strong> Read a resource<\/li>\n<li><strong>POST:<\/strong> Create a new resource<\/li>\n<li><strong>PUT:<\/strong> Update a resource (entire object)<\/li>\n<li><strong>PATCH:<\/strong> Partial update<\/li>\n<li><strong>DELETE:<\/strong> Remove a resource<\/li>\n<li><strong>HEAD \/ OPTIONS:<\/strong> Meta information or capability discovery<\/li>\n<\/ul>\n<h3><strong>Idempotency:<\/strong><\/h3>\n<ul>\n<li>Understand which methods are idempotent (GET, PUT, DELETE) and which are not (POST).<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"_2_HTTP_Status_Codes_%E2%80%93_Master_These\"><\/span><strong>\u00a02. HTTP <a href=\"https:\/\/www.testleaf.com\/blog\/most-common-used-http-response-status-codes\/\">Status Codes<\/a> &#8211; Master These<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<table>\n<tbody>\n<tr>\n<td width=\"56\"><strong>Code<\/strong><\/td>\n<td width=\"122\"><strong>Category<\/strong><\/td>\n<td width=\"199\"><strong>Meaning<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"56\">200<\/td>\n<td width=\"122\">Success<\/td>\n<td width=\"199\">OK<\/td>\n<\/tr>\n<tr>\n<td width=\"56\">201<\/td>\n<td width=\"122\">Success<\/td>\n<td width=\"199\">Resource Created<\/td>\n<\/tr>\n<tr>\n<td width=\"56\">204<\/td>\n<td width=\"122\">Success<\/td>\n<td width=\"199\">No Content (DELETE success)<\/td>\n<\/tr>\n<tr>\n<td width=\"56\">400<\/td>\n<td width=\"122\">Client Error<\/td>\n<td width=\"199\">Bad Request<\/td>\n<\/tr>\n<tr>\n<td width=\"56\">401<\/td>\n<td width=\"122\">Client Error<\/td>\n<td width=\"199\">Unauthorized<\/td>\n<\/tr>\n<tr>\n<td width=\"56\">403<\/td>\n<td width=\"122\">Client Error<\/td>\n<td width=\"199\">Forbidden<\/td>\n<\/tr>\n<tr>\n<td width=\"56\">404<\/td>\n<td width=\"122\">Client Error<\/td>\n<td width=\"199\">Not Found<\/td>\n<\/tr>\n<tr>\n<td width=\"56\">500<\/td>\n<td width=\"122\">Server Error<\/td>\n<td width=\"199\">Internal Server Error<\/td>\n<\/tr>\n<tr>\n<td width=\"56\">502<\/td>\n<td width=\"122\">Server Error<\/td>\n<td width=\"199\">Bad Gateway<\/td>\n<\/tr>\n<tr>\n<td width=\"56\">503<\/td>\n<td width=\"122\">Server Error<\/td>\n<td width=\"199\">Service Unavailable<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"_3_Hands-On_Tools_You_Must_Know\"><\/span><strong>\u00a03. Hands-On Tools You Must Know<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><strong>Postman<\/strong><\/h3>\n<ul>\n<li>Create API requests (GET, POST, PUT, DELETE)<\/li>\n<li>Use <strong>environments<\/strong>, <strong>variables<\/strong>, and <strong>data files<\/strong><\/li>\n<li>Write <strong>pre-request<\/strong> and <strong>test scripts<\/strong> using JavaScript<\/li>\n<li>Automate tests using <strong>Postman Collection Runner<\/strong><\/li>\n<li>Integrate with <strong>Newman<\/strong> for CLI execution<\/li>\n<\/ul>\n<p><a href=\"https:\/\/www.testleaf.com\/course\/selenium-automation-certification-training-course.html\"><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter wp-image-4461 size-full\" src=\"https:\/\/www.testleaf.com\/blog\/wp-content\/uploads\/2025\/03\/Selenium-1.jpg\" alt=\"selenium online training\" width=\"2048\" height=\"512\" srcset=\"https:\/\/www.testleaf.com\/blog\/wp-content\/uploads\/2025\/03\/Selenium-1.jpg 2048w, https:\/\/www.testleaf.com\/blog\/wp-content\/uploads\/2025\/03\/Selenium-1-300x75.jpg 300w, https:\/\/www.testleaf.com\/blog\/wp-content\/uploads\/2025\/03\/Selenium-1-1024x256.jpg 1024w, https:\/\/www.testleaf.com\/blog\/wp-content\/uploads\/2025\/03\/Selenium-1-768x192.jpg 768w, https:\/\/www.testleaf.com\/blog\/wp-content\/uploads\/2025\/03\/Selenium-1-1536x384.jpg 1536w, https:\/\/www.testleaf.com\/blog\/wp-content\/uploads\/2025\/03\/Selenium-1-150x38.jpg 150w\" sizes=\"(max-width: 2048px) 100vw, 2048px\" \/><\/a><\/p>\n<h3><strong>RestAssured (for Java Testers)<\/strong><\/h3>\n<ul>\n<li>Fluent API to <a href=\"https:\/\/www.testleaf.com\/blog\/is-chatgpt-changing-the-game-in-test-case-writing\/\">write readable test cases<\/a><\/li>\n<li>JSON\/XML parsing and validation<\/li>\n<li>Schema validation with JSON Schema<\/li>\n<li>Integrate with JUnit\/TestNG<\/li>\n<li>Attach Allure\/Extent reports<\/li>\n<\/ul>\n<blockquote><p>given()<br \/>\n.baseUri(&#8220;https:\/\/api.example.com&#8221;)<br \/>\n.header(&#8220;Authorization&#8221;, &#8220;Bearer token&#8221;)<br \/>\n.when()<br \/>\n.get(&#8220;\/users&#8221;)<br \/>\n.then()<br \/>\n.statusCode(200)<br \/>\n.body(&#8220;name[0]&#8221;, equalTo(&#8220;John&#8221;));<\/p><\/blockquote>\n<h3><strong>WireMock<\/strong><\/h3>\n<ul>\n<li>Simulate APIs for frontend or backend testing<\/li>\n<li>Stub APIs for different HTTP methods<\/li>\n<li>Mock delayed responses, error codes, etc.<\/li>\n<li>Useful when actual services are unavailable<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"_4_Authentication_Authorization_Types\"><\/span><strong>\u00a04. Authentication &amp; Authorization Types<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li><strong>Basic Authentication<\/strong> \u2013 Use username and password in headers<\/li>\n<li><strong>Bearer Token<\/strong> \u2013 Secure and widely used<\/li>\n<li><strong>API Key<\/strong> \u2013 Passed via headers or query params<\/li>\n<li><a href=\"https:\/\/oauth.net\/2\/\"><strong>OAuth 2.0<\/strong><\/a> \u2013 Secure protocol with multiple flows (Authorization Code, Client Credentials)<\/li>\n<li><strong>JWT (JSON Web Token)<\/strong> \u2013 Compact, URL-safe tokens for stateless authentication<\/li>\n<\/ul>\n<p>Pro Tip: Understand <strong>OAuth2.0 flows<\/strong> and JWT structure (Header, Payload, Signature) for senior-level interviews.<\/p>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"_5_JSON_XML_Essentials\"><\/span><strong>\u00a05. JSON &amp; XML Essentials<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>Learn <strong>JSON structure<\/strong> (objects, arrays, key-value pairs)<\/li>\n<li>Use <strong>JSONPath<\/strong> to extract values from responses<\/li>\n<li>Validate response bodies with <strong>Schema Validation<\/strong><\/li>\n<li>Handle nested objects and arrays<\/li>\n<\/ul>\n<p>Example JSONPath:<\/p>\n<ul>\n<li>$.users[0].name \u2013 First user&#8217;s name<\/li>\n<li>$.data[*].id \u2013 All IDs in the array<\/li>\n<\/ul>\n<h2><a href=\"https:\/\/www.testleaf.com\/all-courses.html\"><img decoding=\"async\" class=\"aligncenter wp-image-4421 size-full\" src=\"https:\/\/www.testleaf.com\/blog\/wp-content\/uploads\/2025\/03\/Online-Classes-1.png\" alt=\"Online Classes\" width=\"2048\" height=\"512\" srcset=\"https:\/\/www.testleaf.com\/blog\/wp-content\/uploads\/2025\/03\/Online-Classes-1.png 2048w, https:\/\/www.testleaf.com\/blog\/wp-content\/uploads\/2025\/03\/Online-Classes-1-300x75.png 300w, https:\/\/www.testleaf.com\/blog\/wp-content\/uploads\/2025\/03\/Online-Classes-1-1024x256.png 1024w, https:\/\/www.testleaf.com\/blog\/wp-content\/uploads\/2025\/03\/Online-Classes-1-768x192.png 768w, https:\/\/www.testleaf.com\/blog\/wp-content\/uploads\/2025\/03\/Online-Classes-1-1536x384.png 1536w, https:\/\/www.testleaf.com\/blog\/wp-content\/uploads\/2025\/03\/Online-Classes-1-150x38.png 150w\" sizes=\"(max-width: 2048px) 100vw, 2048px\" \/><\/a><\/h2>\n<h2><span class=\"ez-toc-section\" id=\"6_Practical_Test_Scenarios\"><\/span><strong>6. Practical Test Scenarios<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Prepare to:<\/p>\n<ul>\n<li>Send and validate <strong>CRUD<\/strong> requests<\/li>\n<li>Validate status codes, headers, cookies<\/li>\n<li>Handle <strong>negative tests<\/strong> (401, 400, 404, etc.)<\/li>\n<li><a href=\"https:\/\/www.testleaf.com\/blog\/top-10-performance-testing-tools-in-2025\/\">Perform <strong>data-driven testing<\/strong><\/a><\/li>\n<li>Test <strong>rate limiting<\/strong>, retries, and error handling<\/li>\n<li>Validate JSON response structure, mandatory fields<\/li>\n<li>Write chained requests (extract token, reuse it)<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"_7_Common_REST_API_Interview_Questions\"><\/span><strong>\u00a07. Common REST API Interview Questions<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><strong>Theory<\/strong><\/h3>\n<ul>\n<li>Explain <a href=\"https:\/\/www.testleaf.com\/blog\/the-6-biggest-challenges-of-rest-api-testing\/\">RESTful API<\/a> design.<\/li>\n<li>What is the difference between PUT and PATCH?<\/li>\n<li>How do you handle versioning in APIs?<\/li>\n<li>What are the REST API best practices?<\/li>\n<li>How do you secure REST APIs?<\/li>\n<\/ul>\n<h3><strong>\u00a0Practical<\/strong><\/h3>\n<ul>\n<li>Write a test to validate the status code and body.<\/li>\n<li>How to parse and assert a value from a nested JSON.<\/li>\n<li>Simulate a timeout and handle it in automation.<\/li>\n<li>How do you test an API that returns different responses randomly?<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"_8_Automation_Real-World_Strategy\"><\/span><strong>\u00a08. Automation &amp; Real-World Strategy<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/CI\/CD\">CI\/CD<\/a> Integration:<\/strong> Run tests using Jenkins, GitHub Actions<\/li>\n<li><strong>Reports:<\/strong> Generate HTML reports using Extent\/Allure<\/li>\n<li><strong>Mocking:<\/strong> Use WireMock or MockServer for environments where real APIs are unstable<\/li>\n<li><strong>Environment Switching:<\/strong> Use global variables and config files for switching base URLs<\/li>\n<li><strong>Parallel Execution:<\/strong> Run collections\/tests in parallel<\/li>\n<\/ul>\n<p><a href=\"https:\/\/www.testleaf.com\/about-us.html\"><img decoding=\"async\" class=\"aligncenter wp-image-4422 size-full\" src=\"https:\/\/www.testleaf.com\/blog\/wp-content\/uploads\/2025\/03\/placements.png\" alt=\"placements\" width=\"2048\" height=\"512\" srcset=\"https:\/\/www.testleaf.com\/blog\/wp-content\/uploads\/2025\/03\/placements.png 2048w, https:\/\/www.testleaf.com\/blog\/wp-content\/uploads\/2025\/03\/placements-300x75.png 300w, https:\/\/www.testleaf.com\/blog\/wp-content\/uploads\/2025\/03\/placements-1024x256.png 1024w, https:\/\/www.testleaf.com\/blog\/wp-content\/uploads\/2025\/03\/placements-768x192.png 768w, https:\/\/www.testleaf.com\/blog\/wp-content\/uploads\/2025\/03\/placements-1536x384.png 1536w, https:\/\/www.testleaf.com\/blog\/wp-content\/uploads\/2025\/03\/placements-150x38.png 150w\" sizes=\"(max-width: 2048px) 100vw, 2048px\" \/><\/a><\/p>\n<h2><span class=\"ez-toc-section\" id=\"9_Bonus_Tips\"><\/span><strong>9. Bonus Tips<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>Keep up with tools like <strong>Swagger<\/strong>, <strong>OpenAPI<\/strong>, and <strong>Insomnia<\/strong><\/li>\n<li>Learn to read Swagger docs to understand API specs<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span><strong>Conclusion<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Acting a REST <a href=\"https:\/\/www.testleaf.com\/blog\/top-25-api-automation-engineer-interview-questionsin-2024-with-answers\/\">API interview<\/a> requires more than just textbook knowledge. You need to combine <strong>conceptual clarity<\/strong>, <strong>hands-on experience<\/strong>, and <strong>problem-solving ability<\/strong>. Focus on mastering HTTP concepts, practice with tools like Postman and RestAssured, and work on real-time <a href=\"https:\/\/www.testleaf.com\/course\/rest-api-testing-certification-training-course.html?utm_source=internallink&amp;utm_medium=blog&amp;utm_campaign=BacklinkbyKarim\"><strong data-start=\"369\" data-end=\"389\">Rest API testing<\/strong><\/a> scenarios including negative testing, authentication, and automation framework design. With this preparation strategy, you&#8217;ll be interview-ready and well-equipped to contribute to any project involving APIs.<\/p>\n<p>&nbsp;<\/p>\n<h5><strong>We Also Provide Training In:<\/strong><\/h5>\n<ul>\n<li><a href=\"https:\/\/www.testleaf.com\/course\/selenium-automation-certification-training-course.html\"><strong>Advanced Selenium Training<\/strong><\/a><\/li>\n<li><a href=\"https:\/\/www.testleaf.com\/course\/playwright.html\"><strong>Playwright Training<\/strong><\/a><\/li>\n<li><a href=\"https:\/\/www.testleaf.com\/course\/genai-qa-engineers-training-course.html\"><strong>Gen AI Training<\/strong><\/a><\/li>\n<li><a href=\"https:\/\/www.testleaf.com\/course\/aws-cloud-architect-certification-training-course.html\"><strong>AWS Training<\/strong><\/a><\/li>\n<li><a href=\"https:\/\/www.testleaf.com\/course\/rest-api-testing-certification-training-course.html\"><strong>REST API Training<\/strong><\/a><\/li>\n<li><a href=\"https:\/\/www.testleaf.com\/course\/full-stack-developer-certification-training-course.html\"><strong>Full Stack Training<\/strong><\/a><\/li>\n<li><a href=\"https:\/\/www.testleaf.com\/course\/appium-mobile-automation-certification-training-course.html\"><strong>Appium Training<\/strong><\/a><\/li>\n<li><a href=\"https:\/\/www.testleaf.com\/course\/dev-ops-master-certification-training-course.html\"><strong>DevOps Training<\/strong><\/a><\/li>\n<li><a href=\"https:\/\/www.testleaf.com\/course\/apache-jmeter-testing-training-course.html\"><strong>JMeter Performance Training<\/strong><\/a><\/li>\n<\/ul>\n<h6><strong>Author\u2019s Bio<\/strong>:<\/h6>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2404 alignleft\" src=\"https:\/\/www.testleaf.com\/blog\/wp-content\/uploads\/2023\/04\/Untitled-design.png\" sizes=\"(max-width: 250px) 100vw, 250px\" srcset=\"https:\/\/www.testleaf.com\/blog\/wp-content\/uploads\/2023\/04\/Untitled-design.png 250w, https:\/\/www.testleaf.com\/blog\/wp-content\/uploads\/2023\/04\/Untitled-design-150x150.png 150w, https:\/\/www.testleaf.com\/blog\/wp-content\/uploads\/2023\/04\/Untitled-design-96x96.png 96w\" alt=\"\" width=\"250\" height=\"250\" \/><\/p>\n<p>As CEO of TestLeaf, I\u2019m dedicated to transforming software testing by empowering individuals with real-world skills and advanced technology. With 24+ years in software engineering, I lead our mission to shape local talent into global software professionals. Join us in redefining the future of test engineering and making a lasting impact in the tech world.<\/p>\n<p><strong>Babu Manickam<\/strong><\/p>\n<p>CEO \u2013 Testleaf<\/p>\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href=\"https:\/\/in.linkedin.com\/in\/babu-manickam\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.testleaf.com\/blog\/wp-content\/uploads\/2025\/07\/linkedin.png\" alt=\"LinkedIn Logo\" width=\"28\" height=\"28\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction In today\u2019s fast-paced tech ecosystem, REST APIs (Representational State Transfer) have become a critical component for enabling communication between client and server. Whether you are applying for an SDET, backend developer, QA automation engineer, or full-stack developer role, API knowledge is a must-have skill. Companies look for professionals who can validate APIs effectively, understand &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/www.testleaf.com\/blog\/how-to-prepare-for-your-rest-api-interview\/\"> <span class=\"screen-reader-text\">How to Prepare for Your REST API Interview<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":1,"featured_media":4486,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"site-sidebar-layout":"default","site-content-layout":"default","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","footnotes":""},"categories":[536,22],"tags":[151,537,25],"class_list":["post-4484","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-rest-api","category-rest-api-testing","tag-api","tag-rest-api","tag-rest-api-testing"],"acf":[],"aioseo_notices":[],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.testleaf.com\/blog\/wp-json\/wp\/v2\/posts\/4484","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.testleaf.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.testleaf.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.testleaf.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.testleaf.com\/blog\/wp-json\/wp\/v2\/comments?post=4484"}],"version-history":[{"count":6,"href":"https:\/\/www.testleaf.com\/blog\/wp-json\/wp\/v2\/posts\/4484\/revisions"}],"predecessor-version":[{"id":6507,"href":"https:\/\/www.testleaf.com\/blog\/wp-json\/wp\/v2\/posts\/4484\/revisions\/6507"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.testleaf.com\/blog\/wp-json\/wp\/v2\/media\/4486"}],"wp:attachment":[{"href":"https:\/\/www.testleaf.com\/blog\/wp-json\/wp\/v2\/media?parent=4484"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.testleaf.com\/blog\/wp-json\/wp\/v2\/categories?post=4484"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.testleaf.com\/blog\/wp-json\/wp\/v2\/tags?post=4484"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}