Sign Up for Free

RunKit +

Try any Node.js package right in your browser

This is a playground to test code. It runs a full Node.js environment and already has all of npm’s 400,000 packages pre-installed, including detect-port with all npm packages installed. Try it out:

var detectPort = require("detect-port")

This service is provided by RunKit and is not affiliated with npm, Inc or the package authors.

detect-port v1.3.0

Node.js implementation of port detector

logo


NPM version build status Test coverage npm download

Node.js implementation of port detector

Usage

$ npm i detect-port --save
const detect = require('detect-port');

/**
 * callback usage
 */

detect(port, (err, _port) => {
  if (err) {
    console.log(err);
  }

  if (port == _port) {
    console.log(`port: ${port} was not occupied`);
  } else {
    console.log(`port: ${port} was occupied, try port: ${_port}`);
  }
});

/**
 * for a yield syntax instead of callback function implement
 */

const co = require('co');

co(function *() {
  const _port = yield detect(port);

  if (port == _port) {
    console.log(`port: ${port} was not occupied`);
  } else {
    console.log(`port: ${port} was occupied, try port: ${_port}`);
  }
});

/**
 * use as a promise
 */

detect(port)
  .then(_port => {
    if (port == _port) {
      console.log(`port: ${port} was not occupied`);
    } else {
      console.log(`port: ${port} was occupied, try port: ${_port}`);
    }
  })
  .catch(err => {
    console.log(err);
  });

Command Line Tool

$ npm i detect-port -g

Quick Start

# get an available port randomly
$ detect

# detect pointed port
$ detect 80

# output verbose log
$ detect --verbose

# more help
$ detect --help

FAQ

Most likely network error, check that your /etc/hosts and make sure the content below:

127.0.0.1       localhost
255.255.255.255 broadcasthost
::1             localhost

Contributors


xudafeng


fengmk2


ziczhu


gaearon


popomore


jsw0528

This project follows the git-contributor spec, auto upated at Tue Aug 14 2018 12:43:52 GMT+0800.

License

MIT

RunKit is a free, in-browser JavaScript dev environment for prototyping Node.js code, with every npm package installed. Sign up to share your code.
Sign Up for Free