Q. What is a REST API?
What the Interviewer Want to Know
They are looking for a clear demonstration that you understand REST principles and can explain how web services use standard HTTP methods to enable resource manipulation in a stateless, scalable manner. Interviewers expect you to mention key concepts such as resource identification through URIs, the use of HTTP verbs (GET, POST, PUT, DELETE) to perform operations, and a focus on stateless communication and data exchange often in JSON or XML format. This question tests not only your technical knowledge of how RESTful systems operate but also your ability to communicate complex ideas succinctly and accurately.
How to Answer
A REST API is a web service that adheres to the principles of Representational State Transfer (REST). It enables communication between systems using standard HTTP methods such as GET, POST, PUT, and DELETE, while ensuring that the server is stateless and resources are identified through URLs.
Structure it like this:
- Start with a brief definition of REST API.
- Explain the use of HTTP methods and statelessness.
- Mention the separation of client and server responsibilities.
Example Answer
"A REST API (Representational State Transfer Application Programming Interface) is a set of rules that allows different systems to communicate over the web using standard HTTP methods like GET, POST, PUT, and DELETE. It treats resources, like data objects, as accessible via unique URLs, and emphasizes stateless interactions where each request contains all necessary information for the server to understand and respond. This approach makes it simple, scalable, and widely compatible, allowing diverse applications such as web and mobile apps to integrate easily."
Common Mistakes
- Focusing too much on technical jargon and not clearly defining REST principles
- Failing to mention that REST uses standard HTTP methods (GET, POST, PUT, DELETE)
- Overcomplicating the answer by including unnecessary details about protocols other than HTTP
- Neglecting to note that REST APIs are stateless, which is a core principle
- Mixing up REST with similar architectures like SOAP, leading to confusion
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