how to access form data using flask?

You are not using curl correctly. Try like this:

curl -d 'uuid=admin&password=admin'

The 400 Bad Request error is the usual behavior when you try to get nonexistent keys from request.form.

Alternatively, use request.json instead of request.form and call curl like this:

curl -d '{"uuid":"admin","password":"admin"}' -H "Content-Type: application/json" 

You still need to return a response:

from flask import abort@app.route('/login/', methods=['GET', 'POST'])def login():    if request.method == 'POST':        user = User.get(request.form['uuid'])        if user and hash_password(request.form['password']) == user._password:            login_user(user, remember=True)            return redirect('/home/')        else:            return abort(401)  # 401 Unauthorized    else:        return abort(405)  # 405 Method Not Allowed

Here's the documentation for custom Flask error pages.

Also, take a look at Flask-Bcrypt for password hashing.

Your CURL command line isn't valid. JSON objects need to have double quotes around the keys and values:

$ curl -d '{"uuid": "admin", "password": "admin"}' http://127.0.0.1:5000/login/

Now, you can access the keys with request.json.