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If you're looking for current API interview questions and answers, you've come to the right place! This Latest 2025 Question List will provide you with a comprehensive list of trending API interview questions and answers asked in Top Companies interview round.

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#	Question	Options	Answer
1	Which of the following is not a valid HTTP methods used in RESTful web services?	GET PUT TIME POST	TIME
2	Which of the following component of HTTP request contains message content or Resource representation?	Request Body URI HTTP Version Request Header	Request Body
3	What URI stands for?	Unit Resource Identifier Uniform Representation Identifier Uniform Resource Identifier None of the above.	Uniform Resource Identifier
4	Which of the following HTTP method should be used to create resource using RESTful web service?	GET DELETE PUT OPTIONS	PUT
5	Public directive of Cache Control Header of HTTP response indicates that resource is cachable by any component.	true false none all	true
6	Which of the following is a best practice for designing a secure RESTful web service?	Validate Malformed XML/JSON - Check for well formed input passed to a web service method. Throw generic Error Messages - A web service method should use HTTP error messages like 403 to show access forbidden etc. Both of the above. None of the above.	Both of the above.
7	What JAX-RS stands for?	Just API for RESTful Web Services. Joint API for RESTful Web Services. JAVA API for RESTful Web Services. None of the above.None of the above.	JAVA API for RESTful Web Services.
8	Which of the following annotation of JAX RS API assigns a default value to a parameter passed to method?	@CookieParam @FormParam @DefaultValue @Context	@DefaultValue
9	A web service is a collection of open protocols and standards used for exchanging data between applications or systems.	true false none all	true
10	POST opearations should be idempotent.	true false none all	false
11	What is the HTTP Code 200 Indicates?	Completed Success Error Warning	Success
12	What is WSDL Stands for?	Webservice Description Language Webservice Definition Language Webservice Dictionary Language Webservice Document Language	Webservice Description Language
13	What is SOAP stands for ?	Simplified Object Access Protocol Select Object Access Protocol Simple Object Access Protocol Sample Object Access Protocol	Simple Object Access Protocol
14	What are the different HTTP Methods available?	GET,SET,DELETE,MARK GET,PUT,REMOVE,POST GET,SAVE,PUT,POST GET,HEAD,CONNECT,OPTIONS	GET,HEAD,CONNECT,OPTIONS
15	What are the mark up languages available in REST Services?	HTML & VBSCRIPT HTML & XML XML & Java JSON & XML	JSON & XML
16	What is the category of 5XX HTTP Codes belongs to?	Server Error Redirection Informational Client Error	Server Error
17	What is the protocol used in REST?	HTTP XML SOAP JMX	HTTP
18	What is the HTTP Code Related to Page Not Found?	403 401 404 402	404
19	What is the Category of the 1XX HTTP Codes belongs to?	Informational Success Client Error Redirection	Informational
20	What does the Acronym REST Stands for?	Rest Interface Representational Assured API REST Assured API Representational State Transfer	Representational State Transfer
21	What is the Category of 4XX HTTP Codes belongs to?	Success Server Error Client Error Informational	Client Error
22	What is the HTTP Code Related to Internal Server Error??	502 501 500 504	500
23	What is the Category of 2XX HTTP Codes belongs to?	Success Server Error Redirection Client Error	Success
24	What is the Category of 3XX HTTP Codes belongs to?	Server Error Client Error Success Redirection	Redirection

An API, or application programming interface, is a set of protocols, routines, and tools that enable different software systems to communicate with each other. APIs allow different systems to share data and functionality, making it possible to create new and innovative applications by combining the capabilities of existing systems.

One of the most common types of APIs is web-based APIs, which are accessed over the internet using standard protocols such as HTTP or HTTPS. These APIs are designed to be accessed by a wide range of systems, including web browsers, mobile apps, and server-side applications.

Another common type of API is a REST API, which stands for Representational State Transfer. REST APIs are based on the principles of REST and use standard HTTP methods, such as GET, POST, PUT, and DELETE, to interact with resources. REST APIs are widely used in the industry and are considered to be a simple, efficient, and scalable way to create web-based APIs.

Another common type of API is SOAP API, which stands for Simple Object Access Protocol. SOAP APIs use XML-based messaging to interact with resources and are often used in enterprise environments.

API testing is the process of testing the functionality and performance of an API. API testing is an important part of the software development process, as it ensures that the API is working correctly and is able to handle the expected load. API testing can be automated or manual, and it can include functional testing, load testing, and security testing.

API documentation is an important part of the API development process. It provides developers with information about the API's functionality, including the methods and parameters that are available. API documentation is usually in the form of a developer guide or reference manual and is usually available online.

In conclusion, an API is a set of protocols, routines, and tools that enable different software systems to communicate with each other. Web-based APIs, REST APIs, and SOAP APIs are the most common types of APIs. API testing is the process of testing the functionality and performance of an API, and API documentation is an important part of the API development process that provides developers with information about the API's functionality.

This page provides a comprehensive collection of API questions and answers, covering a wide range of topics related to APIs, such as:

• Understanding of API concepts such as endpoints, methods, request and response, and data format
• Types of APIs such as REST and SOAP
• Best practices for designing and building APIs
• Securing and protecting APIs
• API documentation and testing
• API management and monitoring
• Integrating APIs with different languages and platforms
• Understanding of microservices architecture and its relationship with APIs

Each question is accompanied by a detailed explanation, providing a comprehensive understanding of the topic at hand. The questions are designed to test the knowledge of both beginners and experienced developers and testers, and are suitable for anyone who wants to improve their understanding of APIs.

This page also provides sample code snippets and examples to help illustrate key concepts and best practices. Whether you are preparing for a job interview, a certification exam, or simply want to improve your API skills, this page is a valuable resource for anyone looking to learn or refresh their knowledge of APIs.