Any way to check if TCP socket in NodeJS has been connected

Question

Any way to check if TCP socket in NodeJS has been connected. As opposed to still connecting in transient. Am looking for a property as opposed to an emitted event. Is it even possible?

My initial answer was that there were no ways to do it without events but I edited it as there is an undocumented way to do it. I strongly advise against it though. — Tristan Foureur
– Tristan Foureur, Commented Apr 11, 2015 at 11:11

Tristan Foureur · Accepted Answer · 2015-04-11 11:09:47Z

4

The manual shows you that an event is emitted for when the connection is established and that is how you should handle it the Node.js way (using non-blocking, asynchronous i/o)

There is though an undocumented way to check it, the socket object has a _connecting boolean property that if set to false means it has been connected already or failed.

Example :

var net = require('net');

//Connect to localhost:80
var socket = net.createConnection(80);

if(socket._connecting === true) {
    console.log("The TCP connection is not established yet");
}

edited Apr 11, 2015 at 11:09

answered Apr 11, 2015 at 11:04

Tristan Foureur

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Alexander Mills Over a year ago

how to test if it is connected?

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