[Answered ]-Making use of the token generated upon log in

If the user is authenticated, you can find the logged in user who is using that token, tokens are usually passed with the header with each request.

You can use a serializer for user details:

@api_view(['GET'])
def current_user(request):
    serializer = UserSerializer(request.user)
    return Response(serializer.data)

or without serializer:

@api_view(['GET'])
def current_user(request):
    user = request.user
    return Response({
        'username': user.username,
        'email': user.email
    })