Postman Security Token Pre-req Script

SecTokenPreReq.js

/*
  Header for your request
*/

header = { 'content-type': 'application/json'};

/*
  Converts the Request to a Obejct.
*/
var sdk = require('postman-collection'),
      url = new sdk.Url(request.url),
      urlJson = url.toJSON();
/*
  Hostname of the request. This is needed if your Auth Service is located on the same host/environment.
  eg - cool-host.domain.com/test-service/some-request
       cool-host.domain.com/auth
*/      
var host = urlJson['host'][0];

var url = 'https://'+host+'.fabmailers.in/fabuser/agent/login';

if(host === 'localhost'){
    url = 'dev-auth-url';
}

request = {   username: 'test',
              password:'password',
            };
/*
  You can change the host to a static value if you have just one environment to test.
*/           
pm.sendRequest({
    url: url,
    method: 'POST',
    header: header,
    body: {
        mode: 'raw',
        raw: JSON.stringify(request)
         }
    }, function (err, res) {
        performAction(err, res);
    });
/*
  Extracts token from the response and adds it to the request header.
*/
function performAction(err, res){
    console.log(res.json());
    var token = res.json().data.token;
    console.log("Got token - " + token);
    pm.request.headers.upsert({key: 'token', value: token });
}