how to run node.js app from cmd with some predefined port in Windows

Question

Is it some command exist to run my node.js code with directly specified port? something like node server.js port=7777 ?

my server.js code looks like this

http.createServer(function (req, res) {
  if (mount(req, res)) return;
}).listen(process.env.PORT || 80);

Solution 1

A simple adding to Alberto's answer. On Windows machine you haven't export command in cmd, use set instead. Then the whole script will be looks like this:

set PORT=7777
node server.js

Note that the syntax in PowerShell is slightly different:

$env:PORT=7777
node server.js

Solution 2

Depending on what server.js contains you should be able to do so.

At a minimum you should read port (you could use https://github.com/substack/node-optimist)

var argv = require('optimist').argv;
console.log(argv.port);

// use it like this
$ node server.js -port 7777

and then listen to it on your server (this depends on what lib you're using).

Run the server like this

export PORT=7777; node server.js

Solution 3

for linux export PORT=5000; node index.js

for windows set PORT=5000; node index.js

in case of powerShell

set $env:PORT=5000; node index.js

const port = process.env.PORT || 3000; app.listen(port,()=>{console.log(Listening on port ${port})})

Comments

[silent_coder]

I update the question with server.js code. Is it possible to do that without modifying server.js content?

[Manjeet]

@AlbertoZaccagni node server.js -port 8000 this one saved my day. Thanks a lot :)

[tarekahf]

Thank you so much. I really love this approach. I did fiddle with the "optimistic" module at my end under Windows. There is an error in your example based on my setup. The command line should be node server.js --port 7777 and you should install the module using npm install optimistic. Now I am able to pass the port in the command line of the node.exe program. But, I could not figure out how to debug this part. In VS Code I can only debug all other parts except the part which is listening to the server. Any feedback?

[Alberto Zaccagni]

@tarekahf I suggest you to open a new question quoting this one as a reference