How to know if instance of `http.Server` in node is already listening

Question

I have an http server and a piece of code that needs to run only when the server is listening. For this, I am binding to the "listening" event like so :

server.on('listening', doSomething)

The thing is that my server might be already listening and then the event "listening" will not be emitted, and my code won't run ... Is there a way to know the status of the server? Something like :

if (server.isListening() === true) doSomething()
else server.on('listening', doSomething)

EDIT I could of course (as suggested in an other similar question) try to connect to that port and see if somebody's listening. But that wouldn't prove that the particular instance I am using is listening. Just that some service is listening there.

Answer 1

Simple

if (server.listening) { # }

https://nodejs.org/api/net.html#net_server_listening

Elaboration

• net.Server has a listening attribute indicating whether the server is listening
• http.Server inherits net.Server