I am fairly new to the whole asynchronous world. Had to start for implementing Twilio video call through node.

I have been trying to call this server side function which then calls another asynchronous function that returns promise. The then portion works fine and I am able to see output in console. But when I try to call another function in then which has an ajax call to the main application to save some data in database.

Neither am I able to send the returned value in response.send() nor am I able to call a function in then.

Please help!

Server Side – index.js

'use strict';  /**  * Load Twilio configuration from .env config file - the following environment  * variables should be set:  * process.env.TWILIO_ACCOUNT_SID  * process.env.TWILIO_API_KEY  * process.env.TWILIO_API_SECRET  */ require('dotenv').load();  const express = require('express'); const http = require('http'); const path = require('path'); const { jwt: { AccessToken } } = require('twilio'); const Twilio = require('twilio'); const jquery = require( 'jQuery'); const cors = require('cors');  const VideoGrant = AccessToken.VideoGrant;  // Max. period that a Participant is allowed to be in a Room (currently 14400 seconds or 4 hours) const MAX_ALLOWED_SESSION_DURATION = 14400;  // Create Express webapp. const app = express();  // Set up the path for the HealthAssure. const startPath = path.join(__dirname, '../HAVideoConsultation/public'); app.use('/HAVideoConsultation', express.static(startPath));  /**  * Default to the application.  */ app.get('/', (request, response) => {   response.redirect('/HAVideoConsultation'); });  /**  * Generate an Access Token for a chat application user - it generates a random  * username for the client requesting a token, and takes a device ID as a query  * parameter.  */ app.get('/token', function(request, response) {   const { identity } = request.query;    // Create an access token which we will sign and return to the client,   // containing the grant we just created.   const token = new AccessToken(     process.env.TWILIO_ACCOUNT_SID,     process.env.TWILIO_API_KEY,     process.env.TWILIO_API_SECRET,     { ttl: MAX_ALLOWED_SESSION_DURATION }   );    // Assign the generated identity to the token.   token.identity = identity;    // Grant the access token Twilio Video capabilities.   const grant = new VideoGrant();   token.addGrant(grant);    // Serialize the token to a JWT string.   response.send(token.toJwt()); });  function pushCompositionId(compositionId){     console.log(compositionId);     jquery.ajax({                     url:'http://localhost:58674/ABC/XYZ',         type:'GET',         data: {CompositionId:compositionId},         cors: true,         success:function(result){              Console.log('Composition Id pushed successfully.');         },         error:function(err){             console.log(err);             return false;         }                 }); }    app.get('/Composition',function(request,response){     const client = new Twilio(process.env.TWILIO_API_KEY,process.env.TWILIO_API_SECRET, {accountSid: process.env.TWILIO_ACCOUNT_SID});      const cid = null;     client.video.compositions         .create({         roomSid: request.query.roomSid,         audioSources: '*',         videoLayout: {           grid : {               video_sources: ['*']           }         },              format: 'mp4'       }).then(composition =>{           console.log("Created Composition with SID=" + composition.sid); // This works properly     cid=composition.sid;     // pushCompositionId(composition.sid); // I want to call this function here   });   response.send(cid); // This does not return proper value });  // Create http server and run it. const server = http.createServer(app); const port = process.env.PORT || 3000; server.listen(port, function() {   console.log('Express server running on *:' + port); });  

Client side

async function GenerateCompositionId(roomsid){ const compositionid = await fetch(`/Composition?roomSid=${roomsid}`);   } 

Server Side function I want to call in then after Composition.sid is generated. If I put this in a try block it gives me error jquery.ajax is not a function. I have included it require and another ajax function on client side is working fine. Why does this not?

function pushCompositionId(compositionId){     jquery.ajax({                     url:'http://localhost:58674/ABC/XYZ',         type:'GET',         data: {CompositionId:compositionId},         cors: true,         success:function(result){              Console.log('Composition Id pushed successfully.');         },         error:function(err){             console.log(err);             return false;         }                 }); }