app\auth\views(6).py

#...
from flask_login import login_user, login_required, \
    current_user, logout_user
from .forms import RegistrationForm, LoginForm
from .errors import forbidden
#...


@auth.route('/login', methods=['GET', 'POST'])
def login():
    form = LoginForm()
    if form.validate_on_submit():
        user = User.query.filter_by(email=form.email.data.lower()).first()
        if user is not None and user.verify_password(form.password.data):
            login_user(user, False)
            return {'user': current_user.to_json()}, 200
        return forbidden('Invalid Credentials')
    else:
        return {'errors': {fieldName.title(): errorMessages for fieldName, errorMessages in form.errors.items()}}, 400
    
@auth.route('/logout')
@login_required
def logout():
    logout_user()
    return {"success": 200}