How can I implement input validation in Django REST Framework?

How can I implement input validation in Django REST Framework?

You can implement input validation in Django REST Framework by using serializers. They allow you to define validation rules for your input data.

Can you show me an example of a serializer with validation?

Sure! Here's a simple example:

from rest_framework import serializers

class UserSerializer(serializers.Serializer):
    username = serializers.CharField(max_length=100)
    email = serializers.EmailField()

    def validate_username(self, value):
        if ' ' in value:
            raise serializers.ValidationError('Username should not contain spaces.')
        return value

What happens if the validation fails?

If validation fails, the serializer will raise a ValidationError, and you can return a 400 Bad Request response with the error details.

Can I customize the error messages?

Yes, you can customize error messages by passing the error_messages argument in the field definition.