# node-portfinder

## Installation

```bash
  $ [sudo] npm install portfinder
```

## Usage

The `portfinder` module has a simple interface:

```js
  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 are supported) :

```js
  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](http://bluebirdjs.com/docs/getting-started.html) 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:

```js
portfinder.basePort = 3000;    // default: 8000
portfinder.highestPort = 3333; // default: 65535
```

or by passing optional options object on each invocation:

```js
portfinder.getPort({
    port: 3000,    // minimum port
    stopPort: 3333 // maximum port
}, callback);
```

## Run Tests

```bash
  $ npm test
```

#### Author: [Charlie Robbins](http://nodejitsu.com)

#### Maintainer: [Erik Trom](https://github.com/eriktrom)

#### License: MIT/X11