node-portfinder
Installation
$ npm install portfinder
Usage
The portfinder
module has a simple interface:
var portfinder = require('portfinder');
portfinder.getPort(function (err, port) {
//
// `port` is guaranteed to be a free port
// in this scope.
//
});
Or with promise (if Promise
s are supported) :
const portfinder = require('portfinder');
portfinder.getPortPromise()
.then((port) => {
//
// `port` is guaranteed to be a free port
// in this scope.
//
})
.catch((err) => {
//
// Could not get a free port, `err` contains the reason.
//
});
If portfinder.getPortPromise()
is called on a Node version without Promise (<4), it will throw an Error unless Bluebird or any Promise pollyfill is used.
Ports search scope
By default portfinder
will start searching from 8000
and scan until maximum port number (65535
) is reached.
You can change this globally by setting:
portfinder.setBasePort(3000); // default: 8000
portfinder.setHighestPort(3333); // default: 65535
or by passing optional options object on each invocation:
portfinder.getPort({
port: 3000, // minimum port
stopPort: 3333 // maximum port
}, callback);
Run Tests
$ npm test