accounts/serializers.py

from django.contrib.auth.models import User
from rest_framework import serializers
from django.contrib.auth import authenticate

class UserSerializer(serializers.ModelSerializer):
    password = serializers.CharField(write_only=True)

    def create(self, validated_data):
        user = User.objects.create_user(
            username=validated_data['username'],
            password=validated_data['password']
        )
        return user

    class Meta:
        model = User
        fields = ('id', 'username', 'password')


class LoginSerializer(serializers.Serializer):
    username = serializers.CharField(max_length=150)
    password = serializers.CharField(max_length=128, write_only=True)

    def validate(self, data):
        username = data.get('username')
        password = data.get('password')
        print(username,password)

        if username and password:
            user = authenticate(username=username, password=password)
            print("user",user)

            if user:
                if user.is_active:
                    data['user'] = user
                else:
                    raise serializers.ValidationError("User is not active.")
            else:
                raise serializers.ValidationError("Unable to log in with the provided credentials.")
        else:
            raise serializers.ValidationError("Must include 'username' and 'password'.")

        return data