REST API Interview Preparation Practice Tests

A REST (Representational State Transfer) API (Application Programming Interface) is a set of rules and conventions for building and interacting with web services. REST APIs use standard HTTP methods, such as GET, POST, PUT, DELETE, and PATCH, to perform various operations on resources, which are typically represented as JSON or XML. The fundamental principle behind REST is statelessness, meaning each request from a client to a server must contain all the information needed to understand and process the request. This simplifies server design and allows for scalable and efficient communication between clients and servers.

One of the key features of REST APIs is their reliance on a uniform interface, which standardizes the interactions between different systems. This uniformity allows developers to use a common set of conventions and tools when working with various APIs, reducing the learning curve and increasing productivity. REST APIs are also known for their flexibility and scalability, as they can be easily modified and extended to meet the changing needs of an application. Furthermore, REST APIs can be consumed by a wide range of clients, including web browsers, mobile applications, and other servers, making them a versatile choice for modern web development.

REST APIs often leverage HTTP status codes to indicate the success or failure of a request. For example, a successful GET request might return a 200 OK status, while a request to a nonexistent resource could return a 404 Not Found status. This use of standard status codes enhances the clarity of communication between clients and servers, helping developers quickly diagnose and resolve issues. Additionally, REST APIs support caching mechanisms, which can improve performance by reducing the need for repeated server requests and decreasing latency.

Security is a crucial consideration when designing REST APIs. Techniques such as authentication and authorization, encryption, and rate limiting are commonly employed to protect sensitive data and ensure that only authorized users can access specific resources. OAuth, JWT (JSON Web Tokens), and API keys are some of the popular methods for securing REST APIs. By implementing robust security measures, developers can safeguard their applications against potential threats and vulnerabilities, ensuring the integrity and confidentiality of data transmitted over the network.

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