{"id":7355,"date":"2025-07-21T05:37:06","date_gmt":"2025-07-21T05:37:06","guid":{"rendered":"https:\/\/www.hirist.tech\/blog\/?p=7355"},"modified":"2025-12-29T05:25:49","modified_gmt":"2025-12-29T05:25:49","slug":"top-25-web-api-interview-questions-and-answers","status":"publish","type":"post","link":"https:\/\/www.hirist.tech\/blog\/top-25-web-api-interview-questions-and-answers\/","title":{"rendered":"Top 25+ Web API Interview Questions and Answers"},"content":{"rendered":"\n<p>A Web API (Application Programming Interface) lets different software systems talk to each other over the internet. It works using HTTP and helps apps share data quickly and easily. The concept of Web APIs dates back to the early 2000s, but it became widely popular with the rise of RESTful APIs, introduced by Roy Fielding in his 2000 doctoral dissertation.&nbsp;Today, Web APIs power everything from mobile apps to cloud platforms. If you are preparing for a backend or full-stack developer role, you will likely face Web API interview questions. This guide covers 25+ commonly asked questions and answers to help you prepare.<\/p>\n\n\n\n<p><strong>Fun Fact<\/strong> \u2013 Over 90% of developers use APIs in some form during software development.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_65 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 \" >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.hirist.tech\/blog\/top-25-web-api-interview-questions-and-answers\/#Basic_Level_Web_API_Interview_Questions_for_Freshers\" title=\"Basic Level Web API Interview Questions for Freshers\">Basic Level Web API Interview Questions for Freshers<\/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.hirist.tech\/blog\/top-25-web-api-interview-questions-and-answers\/#Intermediate_Level_Web_API_Interview_Questions\" title=\"Intermediate Level Web API Interview Questions\">Intermediate Level Web API Interview Questions<\/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.hirist.tech\/blog\/top-25-web-api-interview-questions-and-answers\/#Advanced_Level_Interview_Questions_on_Web_API_for_Experienced_Professionals\" title=\"Advanced Level Interview Questions on Web API for Experienced Professionals&nbsp;\">Advanced Level Interview Questions on Web API for Experienced Professionals&nbsp;<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.hirist.tech\/blog\/top-25-web-api-interview-questions-and-answers\/#Web_API_Interview_Questions_for_5_Years_Experienced\" title=\"Web API Interview Questions for 5 Years Experienced\">Web API Interview Questions for 5 Years Experienced<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.hirist.tech\/blog\/top-25-web-api-interview-questions-and-answers\/#Web_API_Interview_Questions_for_10_Years_Experienced\" title=\"Web API Interview Questions for 10 Years Experienced\">Web API Interview Questions for 10 Years Experienced<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.hirist.tech\/blog\/top-25-web-api-interview-questions-and-answers\/#Web_API_Interview_Questions_for_15_Years_Experienced\" title=\"Web API Interview Questions for 15 Years Experienced\">Web API Interview Questions for 15 Years Experienced<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.hirist.tech\/blog\/top-25-web-api-interview-questions-and-answers\/#Web_API_Scenario_Based_Interview_Questions\" title=\"Web API Scenario Based Interview Questions\">Web 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:\/\/www.hirist.tech\/blog\/top-25-web-api-interview-questions-and-answers\/#Other_Important_Interview_Questions_in_Web_API\" title=\"Other Important Interview Questions in Web API\">Other Important Interview Questions in Web API<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.hirist.tech\/blog\/top-25-web-api-interview-questions-and-answers\/#ASPNET_Core_Web_API_Interview_Questions\" title=\"ASP.NET Core Web API Interview Questions\">ASP.NET Core Web API Interview Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.hirist.tech\/blog\/top-25-web-api-interview-questions-and-answers\/#Web_API_C_Interview_Questions\" title=\"Web API C# Interview Questions\">Web API C# Interview Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.hirist.tech\/blog\/top-25-web-api-interview-questions-and-answers\/#Classic_Web_APINET_Interview_Questions\" title=\"Classic Web API.NET Interview Questions\">Classic Web API.NET Interview Questions<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.hirist.tech\/blog\/top-25-web-api-interview-questions-and-answers\/#Tips_to_Prepare_for_Web_API_Interview\" title=\"Tips to Prepare for Web API Interview&nbsp;\">Tips to Prepare for Web API Interview&nbsp;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.hirist.tech\/blog\/top-25-web-api-interview-questions-and-answers\/#Wrapping_Up\" title=\"Wrapping Up\">Wrapping Up<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.hirist.tech\/blog\/top-25-web-api-interview-questions-and-answers\/#FAQs\" title=\"FAQs\">FAQs<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Basic_Level_Web_API_Interview_Questions_for_Freshers\"><\/span>Basic Level Web API Interview Questions for Freshers<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Here are Web API interview questions and answers designed to help freshers understand core concepts like HTTP methods, routing, and controllers.<\/p>\n\n\n\n<ol>\n<li><strong>What is a Web API and how does it work?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>A Web API is a framework that allows software systems to communicate over the internet using HTTP. It exposes endpoints through which data can be exchanged, often in JSON or XML format. Clients send requests to these endpoints, and the API responds with the required data or action.<\/p>\n\n\n\n<ol start=\"2\">\n<li><strong>Explain the difference between GET and POST methods in HTTP.<\/strong><\/li>\n<\/ol>\n\n\n\n<p>GET is used to fetch data from a server without modifying it. It\u2019s simple and cacheable. POST is used to send data to a server, typically to create or update a resource. It isn\u2019t cached and can carry a larger payload.<\/p>\n\n\n\n<ol start=\"3\">\n<li><strong>What is routing in Web API and how is it configured?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Routing maps incoming HTTP requests to controller actions. In ASP.NET Core Web API, it\u2019s configured using attribute routing like [HttpGet(&#8220;api\/products&#8221;)] or in Startup.cs using MapControllers() with conventional routing patterns.<\/p>\n\n\n\n<ol start=\"4\">\n<li><strong>What are the main return types supported in Web API?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Common return types include IActionResult, ActionResult&lt;T&gt;, void, and specific types like string or List&lt;T&gt;. IActionResult is often preferred for flexibility and control over status codes and content.<\/p>\n\n\n\n<ol start=\"5\">\n<li><strong>How does Web API handle model binding?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Model binding automatically maps HTTP request data to action method parameters. It binds from route values, query strings, headers, or the request body\u2014especially for complex types in POST or PUT methods.<\/p>\n\n\n\n<ol start=\"6\">\n<li><strong>What is the purpose of HTTP status codes in a Web API?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>HTTP status codes help the client understand the result of the request. For example, 200 means OK, 201 means Created, 400 means Bad Request, and 404 means Not Found.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Intermediate_Level_Web_API_Interview_Questions\"><\/span>Intermediate Level Web API Interview Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>These interview questions in Web API are commonly asked to intermediate-level professionals.&nbsp;<\/p>\n\n\n\n<ol start=\"7\">\n<li><strong>How do you implement token-based authentication in Web API?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Token-based authentication is commonly done using JWT (JSON Web Token). When a user logs in, the server returns a signed token. The client sends this token in the Authorization header for future requests. The server then validates the token before allowing access to secure endpoints.<\/p>\n\n\n\n<ol start=\"8\">\n<li><strong>What are action filters and how are they used?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Action filters are used to run custom logic before or after controller actions. You can use built-in filters like [Authorize], or create custom ones by inheriting from ActionFilterAttribute. They&#8217;re useful for logging, validation, or modifying responses.<\/p>\n\n\n\n<ol start=\"9\">\n<li><strong>How do you version a Web API?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>API versioning can be done via URL (e.g., \/api\/v1\/products), query string (?api-version=1.0), or headers. ASP.NET Core supports versioning through the Microsoft.AspNetCore.Mvc.Versioning package. It helps maintain backward compatibility as your API evolves.<\/p>\n\n\n\n<ol start=\"10\">\n<li><strong>What is content negotiation in Web API?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Content negotiation selects the format of the response based on the client&#8217;s Accept header. For example, a client may request JSON or XML. ASP.NET Core handles this using formatters and returns the appropriate response type automatically.<\/p>\n\n\n\n<ol start=\"11\">\n<li><strong>How does attribute routing differ from convention-based routing?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Convention-based routing defines patterns globally, usually in the Startup.cs file. Attribute routing uses annotations like [Route(&#8220;api\/products\/{id}&#8221;)] directly on controllers or actions. It gives more control and clarity at the endpoint level.<\/p>\n\n\n\n<ol start=\"12\">\n<li><strong>How would you handle exceptions globally in Web API?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>In ASP.NET Core, use UseExceptionHandler() middleware for global exception handling. You can also write custom middleware or use filters like ExceptionFilterAttribute to catch and log errors without repeating code in each controller.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Advanced_Level_Interview_Questions_on_Web_API_for_Experienced_Professionals\"><\/span>Advanced Level Interview Questions on Web API for Experienced Professionals&nbsp;<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Let\u2019s go through some advanced-level interview questions in Web API and their answers.<\/p>\n\n\n\n<ol start=\"13\">\n<li><strong>How do you implement custom middleware in ASP.NET Core Web API?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>To create custom middleware, write a class with an Invoke or InvokeAsync method that accepts HttpContext. In the method, you can inspect or modify requests and responses. Then register the middleware in the Startup.cs file using app.UseMiddleware&lt;YourMiddleware&gt;().<\/p>\n\n\n\n<ol start=\"14\">\n<li><strong>What is the role of dependency injection in Web API?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Dependency injection (DI) helps you pass required services into controllers or other components. It supports better testing, reduces tight coupling, and follows SOLID principles. In ASP.NET Core, services are added in Program.cs using builder.Services.AddTransient, AddScoped, or AddSingleton.<\/p>\n\n\n\n<ol start=\"15\">\n<li><strong>How do you secure APIs for internal use only?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>To keep APIs internal, restrict them by IP address using middleware or a reverse proxy like NGINX. You can also use API keys with internal values, or configure access rules in the API gateway if one is in place. Azure and AWS both support private endpoints too.<\/p>\n\n\n\n<ol start=\"16\">\n<li><strong>What are the best practices for designing scalable APIs?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Use pagination for large datasets. Keep endpoints resource-focused and consistent. Use async methods to avoid blocking threads. Avoid large payloads and prefer stateless communication. Monitor response times and apply caching wherever possible.<\/p>\n\n\n\n<ol start=\"17\">\n<li><strong>How would you use caching in Web API to improve performance?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Use in-memory caching like IMemoryCache for short-term storage or IDistributedCache for distributed systems. Apply [ResponseCache] attributes on actions or configure caching in middleware. Cache responses, not just data, when performance matters.<\/p>\n\n\n\n<ol start=\"18\">\n<li><strong>How can you throttle or rate-limit requests in Web API?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Rate limiting prevents abuse. Use third-party packages like AspNetCoreRateLimit or write custom middleware. Limit by IP, endpoint, or user. APIs behind gateways like Azure API Management or AWS API Gateway can configure throttling rules per subscription.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Web_API_Interview_Questions_for_5_Years_Experienced\"><\/span>Web API Interview Questions for 5 Years Experienced<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul>\n<li>What is your approach to versioning an API in production?<\/li>\n\n\n\n<li>Can you describe a challenging bug you fixed in an API project?<\/li>\n\n\n\n<li>How do you handle disagreements in an API design discussion with a teammate?<\/li>\n\n\n\n<li>How do you test the performance of an API endpoint?<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Web_API_Interview_Questions_for_10_Years_Experienced\"><\/span>Web API Interview Questions for 10 Years Experienced<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul>\n<li>How do you evaluate whether an API should be RESTful or follow another pattern?<\/li>\n\n\n\n<li>What has been your most complex API integration project?<\/li>\n\n\n\n<li>How do you mentor junior developers working on API modules?<\/li>\n\n\n\n<li>What security concerns do you prioritize in enterprise-grade APIs?<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Web_API_Interview_Questions_for_15_Years_Experienced\"><\/span>Web API Interview Questions for 15 Years Experienced<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul>\n<li>How do you design APIs that are resilient to failure?<\/li>\n\n\n\n<li>Describe a leadership decision you made during a major API migration.<\/li>\n\n\n\n<li>How do you promote API governance and consistency across teams?<\/li>\n\n\n\n<li>How do you balance business goals with long-term API architecture?<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Web_API_Scenario_Based_Interview_Questions\"><\/span>Web API Scenario Based Interview Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Here are the commonly asked Web API scenario based interview questions for experienced professionals.&nbsp;<\/p>\n\n\n\n<ol start=\"19\">\n<li><strong>How would you debug an API that works locally but fails in production?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Start by checking production logs for errors. Compare environment settings \u2013 API keys, base URLs, or connection strings often differ. Look at CORS issues or missing headers. Test the API using tools like Postman or curl in the production environment.<\/p>\n\n\n\n<ol start=\"20\">\n<li><strong>If an endpoint suddenly starts returning 500 errors, how do you approach the issue?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Check logs for exceptions and stack traces. Look for recent code changes or deployments. I would reproduce the request manually and inspect inputs. If needed, I\u2019d roll back changes and isolate the failing service or database query.<\/p>\n\n\n\n<ol start=\"21\">\n<li><strong>How do you expose different response shapes based on user roles?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Use role-based conditionals in your controller. For example, show limited data to regular users and full details to admins. You can create view models tailored to each role and return the appropriate one based on user claims.<\/p>\n\n\n\n<ol start=\"22\">\n<li><strong>You need to deprecate an old API version. What steps would you follow?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>First, notify consumers via email or headers (Deprecation, Sunset). Provide documentation for the new version. Keep the old version available for a transition period. After the deadline, disable it gradually \u2013 returning 410 (Gone) status if needed.<\/p>\n\n\n\n<ol start=\"23\">\n<li><strong>How would you handle high latency on a frequently used endpoint?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>I would profile the endpoint using tools like Application Insights or ELK Stack. Caching is key\u2014either output caching or data-level caching. I would optimize the database queries, offload work to background jobs, and if needed, add CDN or queueing.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Other_Important_Interview_Questions_in_Web_API\"><\/span>Other Important Interview Questions in Web API<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>This section covers additional interview questions in Web API that don\u2019t fit into a specific level but are often asked in technical rounds.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"ASPNET_Core_Web_API_Interview_Questions\"><\/span>ASP.NET Core Web API Interview Questions<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Here is a list of ASP.NET Web API interview questions commonly asked during technical interviews.<\/p>\n\n\n\n<ol>\n<li>How do you configure dependency injection in ASP.NET Core Web API?<\/li>\n\n\n\n<li>What is the difference between IApplicationBuilder and IWebHostBuilder?<\/li>\n\n\n\n<li>How do you implement logging in ASP.NET Core Web API?<\/li>\n\n\n\n<li>How does the middleware pipeline work in ASP.NET Core?<\/li>\n\n\n\n<li>What is the purpose of the appsettings.json file in ASP.NET Core?<\/li>\n<\/ol>\n\n\n\n<p><strong>Note <\/strong>\u2013 .NET Core Web API interview questions often include topics like dependency injection, middleware pipeline, attribute routing, and async programming with controllers.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Web_API_C_Interview_Questions\"><\/span>Web API C# Interview Questions<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>This section covers Web API interview questions in C# related to routing, controllers, model binding, and error handling.<\/p>\n\n\n\n<ol>\n<li>How do you handle model validation in a Web API controller?<\/li>\n\n\n\n<li>What is the use of IActionResult in C# Web API?<\/li>\n\n\n\n<li>How do you create custom exceptions in a Web API project?<\/li>\n\n\n\n<li>What is the role of async\/await in Web API methods?<\/li>\n\n\n\n<li>How do you serialize and deserialize JSON in Web API?<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Classic_Web_APINET_Interview_Questions\"><\/span>Classic Web API.NET Interview Questions<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Here are DOT NET Web API interview questions frequently asked to test your skills in building and consuming APIs using the .NET framework.<\/p>\n\n\n\n<ol>\n<li>How is routing configured in classic ASP.NET Web API?<\/li>\n\n\n\n<li>What is the use of HttpResponseMessage in .NET Web API?<\/li>\n\n\n\n<li>How do you return different response types in classic Web API?<\/li>\n\n\n\n<li>What is the role of Global.asax in ASP.NET Web API?<\/li>\n\n\n\n<li>How do you handle cross-cutting concerns in classic Web API?<\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-verse\"><strong>Also Read - <a href=\"https:\/\/www.hirist.tech\/blog\/top-20-postman-interview-questions-and-answers\/\" target=\"_blank\" rel=\"noreferrer noopener\">Top 20+ Postman Interview Questions and Answers<\/a><\/strong><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Tips_to_Prepare_for_Web_API_Interview\"><\/span>Tips to Prepare for Web API Interview&nbsp;<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Preparing for a Web API interview means understanding core concepts, real-world scenarios, and being confident with code examples.<\/p>\n\n\n\n<ul>\n<li>Review how HTTP methods (GET, POST, PUT, DELETE) work<\/li>\n\n\n\n<li>Understand status codes and when to use them<\/li>\n\n\n\n<li>Learn routing and attribute routing differences<\/li>\n\n\n\n<li>Practice writing clean and RESTful endpoints<\/li>\n\n\n\n<li>Read about middleware and filters in ASP.NET Core<\/li>\n\n\n\n<li>Practice handling exceptions in a global way<\/li>\n\n\n\n<li>Work with model binding and validation examples<\/li>\n\n\n\n<li>Use tools like Postman to test APIs<\/li>\n\n\n\n<li>Stay updated with .NET Core features<\/li>\n\n\n\n<li>Try solving small API problems or bugs on your own<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-verse\"><strong>Also Read - <a href=\"https:\/\/www.hirist.tech\/blog\/top-20-rest-api-interview-questions-and-answers\/\" target=\"_blank\" rel=\"noreferrer noopener\">Top 50+ REST API Interview Questions and Answers<\/a><\/strong><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Wrapping_Up\"><\/span>Wrapping Up<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>These 25+ Web API interview questions and answers give you a solid understanding of what interviewers expect \u2013 whether you are a fresher or experienced professional. They cover real-world scenarios, coding concepts, and practical use cases to help you feel prepared and confident.<\/p>\n\n\n\n<p>Ready to find your next opportunity? Head over to <a href=\"https:\/\/www.hirist.tech\/\">Hirist<\/a>, the go-to job portal for IT professionals. Find the top <a href=\"https:\/\/www.hirist.tech\/k\/webapi-jobs?ref=blog\" target=\"_blank\" rel=\"noreferrer noopener\">Web API jobs in India<\/a> and apply with ease.<\/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-1752497540123\"><strong class=\"schema-faq-question\"><strong>What are the most commonly asked Web API questions in interviews?<\/strong><\/strong> <p class=\"schema-faq-answer\">Common Web API questions include topics on HTTP methods, status codes, routing, authentication, middleware, and exception handling. You may also be asked to write or explain real API code.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1752497548331\"><strong class=\"schema-faq-question\"><strong>What is the average salary for Web API developers in India?<\/strong><\/strong> <p class=\"schema-faq-answer\">According to AmbitionBox, the salary of an API Developer in India ranges from \u20b92.4 Lakhs to \u20b915 Lakhs for professionals with 1 to 6 years of experience.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1752497558563\"><strong class=\"schema-faq-question\"><strong>What are the 4 main types of Web APIs?<\/strong><\/strong> <p class=\"schema-faq-answer\">The four main types of Web APIs are \u2013<br\/><strong>Open APIs<\/strong> \u2013 Publicly available and accessible by anyone.<br\/><strong>Internal APIs<\/strong> \u2013 Used only within a company or organization.<br\/><strong>Partner APIs<\/strong> \u2013 Shared with specific external partners.<br\/><strong>Composite APIs<\/strong> \u2013 Combine multiple API calls into one response.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1752497567928\"><strong class=\"schema-faq-question\"><strong>What is the role of Web API?<\/strong><\/strong> <p class=\"schema-faq-answer\">The main role of a Web API is to allow different software systems to exchange data and services. It acts as a bridge between a client (like a mobile app) and a server or database.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1752497579551\"><strong class=\"schema-faq-question\"><strong>Where can I find reliable Web API interview questions C# Corner style?<\/strong><\/strong> <p class=\"schema-faq-answer\">You can find Web API interview questions in C# Corner-style blogs that focus on hands-on examples, ASP.NET concepts, and real coding tasks. These are helpful for both freshers and experienced developers preparing for .NET interviews.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1752497590133\"><strong class=\"schema-faq-question\"><strong>What topics should I prepare for .NET Core Web API interview questions?<\/strong><\/strong> <p class=\"schema-faq-answer\">For .NET Core Web API interview questions, focus on dependency injection, middleware, endpoint routing, model validation, and versioning. Understanding async programming and how to work with IActionResult is also important.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1752497598651\"><strong class=\"schema-faq-question\"><strong>How are Web API.NET Core interview questions different from traditional ASP.NET questions?<\/strong><\/strong> <p class=\"schema-faq-answer\">Web API.NET Core interview questions are more focused on modern practices like lightweight middleware pipelines, built-in DI, minimal APIs, and cross-platform development. These differ from older ASP.NET Web API patterns which use heavier frameworks and web.config files.<\/p> <\/div> <\/div>\n","protected":false},"excerpt":{"rendered":"<p>A Web API (Application Programming Interface) lets different software systems talk to each other over&hellip;<\/p>\n","protected":false},"author":1,"featured_media":7365,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,29,19],"tags":[32,34,33],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Top 25+ Web API Interview Questions and Answers (2026) - Hirist Blog<\/title>\n<meta name=\"description\" content=\"Prepare for top Web API interview questions for experienced on REST, HTTP methods, JSON vs XML, WCF vs ASP.NET, and practical usage examples.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.hirist.tech\/blog\/top-25-web-api-interview-questions-and-answers\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Top 25+ Web API Interview Questions and Answers (2026) - 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