Automatically generate and set up access token and host in postman

Automatic access token in Postman.md

Get postman to automatically generate an access token and set up your host and make any request

Changes based on request and response

• Change host to your 'host'
• Your access token key in response maybe different could vary from being acessToken, token, access_token and so on, read accordingly and change the conde where ever access_toekn is being called
• Same for expires in

pm.collectionVariables.set("host", "https://reqbin.com/echo/post/json");
const authTokenReq = {
  url: 'https://reqbin.com/echo/post/json',
  method: 'POST',
  header: {
    "content-type": "application/json"
  },
  body: {
    mode: 'raw',
    raw: JSON.stringify({
      "username": "your user name",
      "password": "your password and other key valus pairs if needed"
    })
  }
};

const porcessResponse = (err, response) => {
  pm.collectionVariables.set("access_token", response.json().access_token);
  var expiryDate = new Date();
  expiryDate.setSeconds(expiryDate.getSeconds() + response.json().expires_in);
  pm.collectionVariables.set("expires_in", expiryDate.getTime());
};

if (!pm.collectionVariables.get('expires_in') || !pm.collectionVariables.get('access_token')) {
  pm.sendRequest(authTokenReq, (err, response) => porcessResponse(err, response));
} else if (pm.collectionVariables.get('expires_in') <= (new Date()).getTime()) {
  pm.sendRequest(authTokenReq, (err, response) => porcessResponse(err, response));
}