How can I implement input validation in Django APIs?

How can I implement input validation in Django APIs?

You can use Django's serializers to validate input data in your APIs. Would you like a code example?

Yes, please provide a code example.

Sure! Here's a simple example using Django REST Framework:

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 if I want to add custom validation for the email field?

You can add a custom validation method for the email field as well. For example:

def validate_email(self, value):
    if not value.endswith('@example.com'):
        raise serializers.ValidationError('Email must be from the domain example.com.')
    return value