Django REST Framework Explained: Building APIs on Django

What Django REST Framework actually adds to Django, a basic serializer/viewset example, and when it’s the right choice for an API

Django REST Framework (DRF) is what most Django projects reach for the moment they need to expose an API rather than server-rendered HTML pages.

What DRF actually adds

Plain Django can return JsonResponse from any view — DRF isn’t required to return JSON at all. What it adds is everything around that: serializers that convert model instances to and from JSON with validation built in, viewsets that collapse the usual list/create/retrieve/update/delete boilerplate into a few lines, and a permission/authentication system that plugs into Django’s existing auth.

A basic example

from rest_framework import serializers, viewsets

class BookSerializer(serializers.ModelSerializer):
    class Meta:
        model = Book
        fields = ["id", "title", "author", "published"]

class BookViewSet(viewsets.ModelViewSet):
    queryset = Book.objects.all()
    serializer_class = BookSerializer

Registered with a DRF router, that’s a complete set of CRUD endpoints — list, create, retrieve, update, delete — with request validation, pagination, and filtering hooks already wired up. The equivalent hand-written in plain Django views would be considerably more code, repeated for every model.

The browsable API

DRF auto-generates a clickable HTML interface for every endpoint — you can browse a list, submit a test POST request, and see validation errors rendered in the browser, without a separate API client like Postman. This is a genuine productivity feature for teams handing an API to frontend developers or third parties: the API documents itself as you build it.

DRF vs plain Django views

If you only need one or two simple JSON endpoints, plain Django views returning JsonResponse are less overhead than adopting DRF’s serializer/viewset patterns. DRF earns its complexity once you have several models needing consistent CRUD behaviour, real permission logic, or an API surface other teams depend on — at that point, hand-rolling what DRF already provides is wasted effort.

When to reach for FastAPI instead

If you’re starting a new project with no existing Django investment and only need a JSON API — no admin panel, no server-rendered pages — FastAPI is worth comparing before committing to Django plus DRF. See Django REST Framework vs FastAPI for the fuller comparison. DRF’s advantage is specifically for teams already building on Django who want the ORM and admin panel alongside a proper API layer, not starting from a blank slate.