Introduction

Django REST Framework (DRF) is a toolkit for building Web APIs on top of Django. It does not replace Django - it layers onto it, reusing the ORM, settings, URL routing and authentication system you already know and supplying the pieces Django leaves out when a response is JSON instead of HTML.

In many modern projects Django is used purely as a backend service, with the frontend built in React, Vue or Angular, or with the consumer being a mobile app or another service entirely. Django's job is then no longer to render templates, but to expose a robust, secure and well-documented API. That is the gap DRF fills.

Learning DRF alongside Django gives you the flexibility to build either full-stack applications with Django's MVT stack, or API-driven backends with Django + DRF. Large projects frequently do both in the same codebase.

Why use DRF?

• Serialization: Serializers easily convert querysets and model instances into formats like JSON. They also validate and rebuild objects using incoming data. They support both ORM and non-ORM data sources.
• Web Browsable API: DRF creates a visual, easy-to-navigate HTML version of your API. You can explore and test it directly in your browser using built-in forms before writing any frontend code.
• Powerful Defaults: Built-in tools, such as Generic Views and ViewSets, automatically handle common CRUD operations.
• Customizable: The framework is highly customizable, allowing you to use regular function-based views for simple APIs that don't need the advanced features and for individual endpoints where the abstraction stops helping.
• Mature Ecosystem: DRF has been the top choice for Django APIs for over a decade. It offers excellent documentation, strong community support and reliable add-ons for security, filtering and API structure.

Core Components

Component	Purpose
Request & Response	DRF's own request/response objects, adding parsed request.data and content negotiation on top of Django's.
Serializers	Convert complex data (like model instances) into native Python datatypes that can be easily rendered into JSON/XML and vice versa.
Views / ViewSets	Handle the logic for answering requests and returning responses. DRF provides generic views to speed up common patterns.
Routers	Automatically generate URLs for your API by wiring up ViewSets.
Authentication & Permissions	Secure your API by identifying users and defining access control rules, at both the view and the object level.
Parsers & Renderers	Decide how request bodies are read and how responses are written - JSON, form data, multipart or browsable HTML.
Pagination & Throttling	Split large result sets into pages and limit how frequently a client may call the API to protect your system from overload.