What is a REST API?

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A REST API (Representational State Transfer Application Programming Interface) is a way for different software systems to communicate over the internet using standard HTTP methods. It follows a set of architectural principles that make APIs easy to use, scalable, and stateless.

Key Concepts:

• Resources: In REST, data is treated as resources. Each resource (e.g. a user, product, or blog post) is identified by a URL (e.g. /api/users/1).

• HTTP Methods:

  • GET – Retrieve data (e.g. get a list of users)

  • POST – Create a new resource (e.g. add a new user)

  • PUT / PATCH – Update an existing resource

  • DELETE – Remove a resource

• Stateless: Each request from a client must contain all the information the server needs to process it. The server doesn’t store session data between requests.

• JSON Format: Most REST APIs exchange data in JSON format, which is lightweight and easy for both humans and machines to read.

Why Use REST APIs?

• Language-independent

• Scalable and simple

• Works with standard HTTP

• Widely adopted in web and mobile apps

In Django:

You can build REST APIs using Django REST Framework (DRF), which makes it easy to create views, serializers, and endpoints for your data.

In summary, a REST API allows clients (like web or mobile apps) to interact with server-side data in a predictable and standardized way using HTTP.

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