Get Query Params in express node js

 var url = 'http://localhost:3002/callback#access_token=nQevH_hZSjs3qdOoLNnAIITwqd3lCdkq&expires_in=7200&token_type=Bearer';

 function getUrlParameter(name) {
    name = name.replace(/[\[]/, '\\[').replace(/[\]]/, '\\]');
    var regex = new RegExp('[\\#&]' + name + '=([^&#]*)');
    var results = regex.exec(url);
    return results === null ? '' : decodeURIComponent(results[1].replace(/\+/g, '    '));
};

 console.log(getUrlParameter('access_token'));
 console.log(getUrlParameter('expires_in'));
 console.log(getUrlParameter('token_type'));

Best practice is to use ? instead of #

So your url should be

http://localhost:3002/callback?access_token=nQevH_hZSjs3qdOoLNnAIITwqd3lCdkq&expires_in=7200&token_type=Bearer

Now you can get the query params with below method

var express = require('express');
var app = express();

app.get('/callback', function(req, res){
  console.log('access_token: ' + req.query.access_token);
  console.log('expires_in: ' + req.query.expires_in);
  console.log('token_type: ' + req.query. token_type);
});

app.listen(3000);

Anything after the # isn't sent to the server by the browser.. you can
only parse it if the url is generated or obtained from the server. Then you can use nodes in-built url module to parse symbols in the url

You can use the substring() method: EDIT: the string you can get from response.body. You have to use body-parser or express.json

let str = "http://localhost:3002/callback#access_token=nQevH_hZSjs3qdOoLNnAIITwqd3lCdkq&expires_in=7200&token_type=Bearer";
    let index=str.indexOf("#");
    let res = str.substring(index+1);

Output: $ node server.js access_token=nQevH_hZSjs3qdOoLNnAIITwqd3lCdkq&expires_in=7200&token_type=Bearer