is-port-available (nodejs)

(async) isPortAvailable() : Will test the requested port, resolving the returned Promise with true, when port IS AVAILABLE, and false when NOT AVAILABLE.

NOTE: When port is NOT AVAILABLE, the fail reason (err.code | err) can be checked reading isPortAvailable.lastError property (wich is reset automatically before each call to isPortAvailable)

Methods

isPortAvailable( port ) (function) => Expects an integer, and returns a Promise that resolves in true|false

isPortAvailable.lastError (string) => Contains the last call error (EADDRINUSE, EACCES...)

Installation

Use npm to install the module : $ npm install --save is-port-available

NPM Package Page

Usage

Example of a simple port avaiability test via Promise.then():

    const isPortAvailable = require('is-port-available');

    var port = 80;
    isPortAvailable(port).then( status =>{
        if(status) console.log('Port ' + port + ' IS available!');
        else{
            console.log('Port ' + port + ' IS NOT available!');
            console.log('Reason : ' + isPortAvailable.lastError);
        }
    });

Example Using await inside an async self invoking function :

    const isPortAvailable = require('is-port-available');

    (async function(){
        var port = 80;
        var status = await isPortAvailable(port);

        if(status) console.log('Port ' + port + ' IS available!');
        else{
            console.log('Port ' + port + ' IS NOT available!');
            console.log('Reason : ' + isPortAvailable.lastError);
        }

    })()

Licence

GPL

Package detail