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Edit File: README.md

# node-portfinder [![CI](https://github.com/http-party/node-portfinder/actions/workflows/ci.yml/badge.svg?branch=master)](https://github.com/http-party/node-portfinder/actions/workflows/ci.yml)

## Installation

``` bash
  $ 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`s 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.setBasePort(3000);    // default: 8000
portfinder.setHighestPort(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][0]
#### Author/Maintainer: [Erik Trom][1]
#### License: MIT/X11
[0]: http://nodejitsu.com
[1]: https://github.com/eriktrom