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find-free-port
Advanced tools
Find free tcp port or pors to listen on. The definition of 'free' port is that connecting to this port and host ('localhost' by default) will not succeed, and thus 'free'.
npm install find-free-port --save
Find a free port to listen on that is >= 3000
var fp = require("find-free-port")
fp(3000, function(err, freePort){
});
Find a free port to listen on that is >= 3000 and < 3100
var fp = require("find-free-port")
fp(3000, 3100, function(err, freePort){
});
Find 3 free ports to listen on that is >= 3000 locally
var fp = require("find-free-port")
fp(3000, 3100, '127.0.0.1', 3, function(err, p1, p2, p3){
});
Find a free port that is >= 3000 and at host 192.168.100.1
var fp = require("find-free-port")
fp(3000, "192.168.100.1", function(err, freePort){
});
If the callback is omitted, then the call returns a Promise that resolve to a list of avaiable ports:
var fp = require("find-free-port")
fp(3000).then(([freep]) => {
console.log('found ' + freep);
}).catch((err)=>{
console.error(err);
});
FAQs
find a free tcp port to listen locally
The npm package find-free-port receives a total of 16,315 weekly downloads. As such, find-free-port popularity was classified as popular.
We found that find-free-port demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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