facebook-oauth-url.ts

import * as queryString from 'query-string';

const stringifiedParams = queryString.stringify({
  client_id: process.env.APP_ID_GOES_HERE,
  redirect_uri: 'https://www.example.com/authenticate/facebook/',
  scope: ['email', 'user_friends'].join(','), // comma seperated string
  response_type: 'code',
  auth_type: 'rerequest',
  display: 'popup',
});

const facebookLoginUrl = `https://www.facebook.com/v4.0/dialog/oauth?${stringifiedParams}`;