Node JS: net.Socket is not a constructor

Question

The below code works fine if I run it from my command line, but if I run this code anywhere in my project I get this error:

net.Socket is not a constructor

I've tried making the below code an object and importing / requiring it into my project and I still get that error.

var net = require('net');

var client = new net.Socket();
    client.connect(3000, '127.0.0.1', function() {
    console.log('Connected');
    client.write('Hello, server! Love, Client.');
});

Am I miss understanding what require does, I also tried using import and import * as to obtain 'net'.

I'm not too sure what information would be useful in the situation. Any suggestions would be great.

Are you running this code via node or browser? If from node, what version of node (node -v)? — mscdex
– mscdex, Commented Nov 14, 2016 at 22:59
It works fine if I run in via node, e.g. node test.js (it works), if I run it via my browser I get net.createConnection is not a constructor or net.Socket is not a constructor. Node version 4.4.5 — Adam Edney
– Adam Edney, Commented Nov 14, 2016 at 23:04

mscdex · Accepted Answer · 2016-11-14 23:06:50Z

9

There are no plain TCP sockets in the browser, so that is why trying to use net.Socket in the browser (via webpack, browserify, etc.) won't work.

There could be a "polyfill" of sorts that requires a server to make the TCP connection on the browser's behalf though (or perhaps via some bridge to a Flash or Java applet).

answered Nov 14, 2016 at 23:06

mscdex

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5 Comments

Adam Edney Over a year ago

Thanks, I'll look into implementing polyfill to get it working.

Krishna Over a year ago

@AdamEdney : Hi adam, I am getting the same issue, any updates in this

Adam Edney Over a year ago

@Krishna I decided to use a websocket. i.e. npmjs.com/package/websocket. Hope this helps!

Kiran Kumar Over a year ago

@AdamEdney : Are you able to connect to any TCP server using websocket or is it only work with the websocket server.

Adam Edney Over a year ago

@javadeveloper To be honest I'm no expert, I have only tested it with a server that has web socket server.

Sandeep chand · Accepted Answer · 2021-09-13 16:18:06Z

0

use node 16 version. these features are currently under Node.js v16.9.1 https://nodejs.org/dist/latest-v16.x/docs/api/net.html

answered Sep 13, 2021 at 16:18

Sandeep chand

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