Loopback: How can we modify the return data of a built in model function

Question

I created a model named member inherited from the built in model User, But how can I change the format of the login return. ie,

currently the invalid login is returning like

{
  "error": {
    "statusCode": 401,
    "name": "Error",
    "message": "login failed",
    "code": "LOGIN_FAILED",
    "stack": "Error: login failed\n ..."
  }
}

I want to change like,

{
    "code": 401,
    "name": "Error",
    "message": "login failed",
    "code": "LOGIN_FAILED",
    "stack": "Error: login failed\n ..."
}

Also, the success case as well,

ie current return is

{
  "id": "P1jAavmCRbiYB1gYaE2snj3I6BayIYOCJ7HsTLeF1bezlEGVAUzjwdxKB5QFH9Vu",
  "ttl": 1209600,
  "created": "2017-02-02T13:19:05.709Z",
  "userId": "5885b186db6df92d3ada7777"
}

I want to change like,

{
  "code": 200,
  "name": "Success",
  "token": "P1jAavmCRbiYB1gYaE2snj3I6BayIYOCJ7HsTLeF1bezlEGVAUzjwdxKB5QFH9Vu",
  "ttl": 1209600,
  "created": "2017-02-02T13:19:05.709Z",
  "userID": "5885b186db6df92d3ada7777"
}

Is it possible or not?

Answer 1

You need to remove strong-error-handler from middlewares and add your custom error handler like this

In config.json you need to do :

...
"remoting" {
  ...
  "handleErrors": false
  ...
}
...

Also create config.local.js in root/sever folder and add below :

'use strict';

var errorConverter = require('./middlewares/error-converter');

module.exports = {
  remoting: {
    errorHandler: {
      handler: errorConverter()
    }
  }
};

error-converter.js in middleare folder (or any other place) is the custom error hadnling middleare