Postman pre-request script to automatically get a bearer token from our custom software 'mDIS' and save it for reuse

postman-pre-request-mdis.js

// set these variables on the folder level
// also select Postman No-Authentication option, and then set your own HTTP Autorization Header
var url = pm.variables.get('baseUrl') + "/api/v1/auth/login";
var username = pm.variables.get('username');
var password = pm.variables.get('password');
const echoPostRequest = {
  url: url,
  method: 'POST',
  header: 'Content-Type:application/json',
  body: 
  {
            mode: 'urlencoded',
            urlencoded: [
                    { key: "username", value: username },
                    { key: "password", value: password },
            ]
    }
};

var getToken = true;

if (!pm.variables.get('currentAccessToken')) {
    console.info(url + ': Token missing, will get new token...')
} else {
    getToken = false;
    console.info(url + ': Token is good');
}
console.log(echoPostRequest);
    
if (getToken === true) {
    pm.sendRequest(echoPostRequest, function (err, res) {
    if (err) { 
        console.log(err); 
    } else {
        console.log('Saving the token')
        var responseJson = res.json();
        
        pm.variables.set('currentAccessToken', responseJson.token)

    }
    });
}