Node.js server.listen callback?

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I have a node.js application and I need to run a command once the server starts listening. The docs on server.listen say:

server.listen(port, [hostname], [backlog], [callback])

but when I try to use this format, the code is not run, but no error messages are appearing. Here is the listening part of my application:

var spawn = require('child_process').spawn
function listen(port) {
    try {
        server.listen(port, "localhost",511, function() {
          spawn("open",["http://localhost:"+port+"/"])
        })
    } catch (e) {
        listen(port+1)
    }
}

Thanks,

Vulpus

asked 19 secs ago

Vulpus

635