How to send error http response in express/node js?

Question

So in login page I am sending credentials from angular to express through get request.What I wanna do is that if found in database,send response and handle it in angular else if not found in db I want express to send error response and handle it angular error response function but my code isnt working.

Angular controller:

myapp.controller('therapist_login_controller', ['$scope', '$localStorage', '$http',
  function($scope, $localStorage, $http) {
    $scope.login = function() {
      console.log($scope.username + $scope.password);
      var data = {
        userid: $scope.username,
        password: $scope.password
      };
      console.log(data);
      $http.post('/api/therapist-login', data)
        .then(
          function(response) {
            // success callback
            console.log("posted successfully");
            $scope.message = "Login succesful";
          },
          function(response) {
            // failure callback,handle error here
            $scope.message = "Invalid username or password"
            console.log("error");
          }
        );
    }
  }
]);

APP.js:

  app.post('/api/therapist-login', therapist_controller.login);

Controller:

  module.exports.login = function(req, res) {

    var userid = req.body.userid;
    var password = req.body.password;
    console.log(userid + password);

    Credentials.findOne({
      'userid': [userid],
      'password': [password]
    }, function(err, user) {
      if (!user) {
        console.log("logged err");
        res.status(404); //Send error response here
        enter code here
      } else {
        console.log("login in");
      }
    });
  }

response['status_code'] = status_code; response['message'] = status_message; response['error_message'] = error_message; return res.jsonp(response); — Nitish Agarwal
– Nitish Agarwal, Commented Mar 8, 2016 at 10:37
What aspect of the code isn't working? Do you receive the response's status but no error message? Does the error handler for the $http promise fail to work. You'll get answers quickly if you could provide some clarity on the problem. — gnerkus
– gnerkus, Commented Mar 8, 2016 at 10:58

michelem · Accepted Answer · 2020-04-26 16:06:26Z

133

In Node with ExpressJS you can use res.status() to send the error:

return res.status(400).send({
   message: 'This is an error!'
});

In Angular you can catch it in the promise response:

$http.post('/api/therapist-login', data)
    .then(
        function(response) {
            // success callback
            console.log("posted successfully");
            $scope.message = "Login succesful";

        },
        function(response) {
            // failure callback,handle error here
            // response.data.message will be "This is an error!"

            console.log(response.data.message);

            $scope.message = response.data.message
        }
    );

edited Apr 26, 2020 at 16:06

answered Mar 8, 2016 at 11:02

michelem

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1 Comment

What Would Be Cool Over a year ago

You can also use the json method javascript req.status(400).json({ message: "This is an invalid request" });

Vlad · Accepted Answer · 2018-03-24 08:11:19Z

16

Or use instance of Error class

response.status(code).send(new Error('description'));

answered Mar 24, 2018 at 8:11

Vlad

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