title: how to hide password with ********* on swagger ui with flask_restplus in python
body: <p>Hi Below is my running code , can be accessed with below URL:
  <a href="http://127.0.0.1:5000/api/documentation" rel="nofollow noreferrer">http://127.0.0.1:5000/api/documentation</a></p>
  
  <pre><code>from flask import Flask, Blueprint
  from flask_restplus import Api, Resource, fields
  
  app = Flask(__name__)
  blueprint = Blueprint('api', __name__, url_prefix='/api')
  api = Api(blueprint, doc='/documentation') #,doc=False
  
  app.register_blueprint(blueprint)
  
  app.config['SWAGGER_UI_JSONEDITOR'] = True
  
  login_details = api.model('LoginModel',{'user_name' : fields.String('The Username.'),'pass_word' : fields.String('The password.'),})
  # pass_word = api.model('Pwd', {'pass_word' : fields.String('The password.')})
  credentials = []
  python = {'user_name' : '1234','pwd':'23213413'}
  credentials.append(python)
  
  @api.route('/login')
  class Language(Resource):
  
      @api.marshal_with(login_details, envelope='the_data',mask='pass_word')
      def get(self):
          return credentials
  
      @api.expect(login_details)
      @api.marshal_with(login_details, envelope='the_data',mask='pass_word')
      def post(self):
          login_details = api.payload
          print(login_details)
          login_details['id'] = len(credentials) + 1
  
          credentials.append(login_details)
          return {'result' : 'credentials added'}, 201
  
  if __name__ == '__main__':
      app.run(debug=True)
  
  </code></pre>
  
  <p>Can you please tell what should i do to to hide the password with ***** when i entering on the swagger UI , and value should be passed to the argument correctly.</p>