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JavaScript

Sahil Kapoor
Sahil Kapoor
8,932 Points
Posted by Sahil Kapoor
Sahil Kapoor
8,932 Points

How to wait until a request is complete in node.js?

let request = https.get(`https://teamtreehouse.com/${username}.json`, response => {
  console.log(response.headers);
});

In the above code I'm just making a get request to teamtreehouse API but the problem is that as JavaScript being Asynchronous the code after this runs first while the request is in process. So how do I make JavaScript synchronous so that it completes this process first and then do interpret further code.

2 Answers

Samuel Ferree
Samuel Ferree
31,722 Points
Samuel Ferree
Samuel Ferree
31,722 Points

My google search indicates the best answer is this node package: https://www.npmjs.com/package/sync-request

Balázs Buri
Balázs Buri
8,799 Points
Balázs Buri
Balázs Buri
8,799 Points

if you'd like to solve this without using an extra package you can refer to the nodejs documentation

this is the example code from the documentation with my comments:

const https = require('https');

https.get('https://encrypted.google.com/', (res) => { // <- this is a function that is called when there's a response. Waiting for a response is as easy as writing code inside this function (or use async await)
  console.log('statusCode:', res.statusCode);
  console.log('headers:', res.headers);

  res.on('data', (d) => { //this is a function attached to the response's 'data' event. it's called every time a chunk of data arrives. (multiple times per request)
    process.stdout.write(d);
  });

}).on('error', (e) => { //the https.get function returns a request that can emit an error event. this is an eventlistener for that. try an invalid url to test this branch of your code
  console.error(e);
});

hope this helps