A simple Node.js module to check if a TCP port is already bound. 

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tcp-port-used

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 * A simple promises-based check to see if a TCP port is already in use.

// define the exports first to avoid cyclic dependencies.

exports.waitUntilFreeOnHost = waitUntilFreeOnHost;

exports.waitUntilUsedOnHost = waitUntilUsedOnHost;

var debug = require('debug')('tcp-port-used');

 * Creates an options object from all the possible arguments

 * @param {Number} port a valid TCP port number

 * @param {String} host The DNS name or IP address.

 * @param {Boolean} status The desired in use status to wait for: false === not in use, true === in use

 * @param {Number} retryTimeMs the retry interval in milliseconds - defaultis is 200ms

 * @param {Number} timeOutMs the amount of time to wait until port is free default is 1000ms

 * @return {Object} An options object with all the above parameters as properties.

function makeOptionsObj(port, host, inUse, retryTimeMs, timeOutMs) {

 * Checks if a TCP port is in use by creating the socket and binding it to the

 * target port. Once bound, successfully, it's assume the port is availble.

 * After the socket is closed or in error, the promise is resolved.

 * Note: you have to be super user to correctly test system ports (0-1023).

 * @param {Number|Object} port The port you are curious to see if available. If an object, must have the parameters as properties.

 * @param {String} [host] May be a DNS name or IP address. Default '127.0.0.1'

 * @return {Object} A deferred Q promise.

 * var tcpPortUsed = require('tcp-port-used');

 *    console.error('Error on check: '+util.inspect(err));

        opts = makeOptionsObj(port, host);

        debug('Error invalid port: '+util.inspect(opts.port));

        deferred.reject(new Error('invalid port: '+util.inspect(opts.port)));

        debug('set host address to default 127.0.0.1');

            client.removeAllListeners('connect');

            client.removeAllListeners('error');

        //debug('listeners removed from client socket');

        //debug('check - promise resolved - in use');

        if (err.code !== 'ECONNREFUSED') {

            //debug('check - promise rejected, error: '+err.message);

            //debug('check - promise resolved - not in use');

    client.connect({port: opts.port, host: opts.host});

 * Creates a deferred promise and fulfills it only when the socket's usage

 * equals status in terms of 'in use' (false === not in use, true === in use).

 * Will retry on an interval specified in retryTimeMs.  Note: you have to be

 * super user to correctly test system ports (0-1023).

 * @param {Number|Object} port a valid TCP port number, if an object, has all the parameters described as properties.

 * @param {Boolean} status The desired in use status to wait for false === not in use, true === in use

 * @param {Number} [retryTimeMs] the retry interval in milliseconds - defaultis is 200ms

 * @param {Number} [timeOutMs] the amount of time to wait until port is free default is 1000ms

 * @return {Object} A deferred promise from the Q library.

 * tcpPortUsed.waitForStatus(44204, 'some.host.com', true, 500, 4000)

 *     console.log('Port 44204 is now in use.');

 *     console.log('Error: ', error.message);

function waitForStatus(port, host, inUse, retryTimeMs, timeOutMs) {

    // the first arument may be an object, if it is not, make an object

        opts = makeOptionsObj(port, host, inUse, retryTimeMs, timeOutMs);

        deferred.reject(new Error('inUse must be a boolean'));

    if (!is.positiveInt(opts.retryTimeMs)) {

        debug('set retryTime to default '+RETRYTIME+'ms');

    if (!is.positiveInt(opts.timeOutMs)) {

        debug('set timeOutMs to default '+TIMEOUT+'ms');

        deferred.reject(new Error('timeout'));

    timeoutId = setTimeout(timeoutFunc, opts.timeOutMs);

            //debug('doCheck inUse: '+inUse);

            //debug('doCheck opts.inUse: '+opts.inUse);

                retryId = setTimeout(function() { doCheck(); }, opts.retryTimeMs);

    "description": "A simple Node.js module to check if a TCP port is already bound.",

        "test" : "./node_modules/.bin/mocha --reporter=list ./test.js"

        "url": "git://github.com/jut-io/tcp-port-used.git"

        "url": "https://github.com/jut-io/tcp-port-used/issues"

    "homepage": "https://github.com/jut-io/tcp-port-used",

		@@ -92,2 +92,5 @@ /**
		client.removeAllListeners('error');
		client.end();
		client.destroy();
		client.unref();
		}
		@@ -100,4 +103,2 @@ //debug('listeners removed from client socket');
		deferred.resolve(inUse);
		client.end();
		client.unref();
		cleanUp();
		@@ -110,3 +111,2 @@ }
		deferred.reject(err);
		cleanUp();
		} else {
		@@ -117,6 +117,4 @@ //debug('ECONNREFUSED');
		deferred.resolve(inUse);
		cleanUp();
		}
		client.destroy();
		client.unref();
		cleanUp();
		}
		@@ -123,0 +121,0 @@

		{
		"name": "tcp-port-used",
		"version": "0.1.0",
		"version": "0.1.1",
		"description": "A simple Node.js module to check if a TCP port is already bound.",
		@@ -5,0 +5,0 @@ "main": "index.js",

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