$ gnpm install getport
npm install getport
Find an open port to listen on.
var getport = require('getport')
getport(function (e, p) {
  if (e) throw e
  server.listen(p)
})
Note: getport uses a TCP client to check the ports and see if anyone has bound to them. If you do not have permission to bind to a port you may still get an error.
getport(start, function (e, port) {})getport(5000, function (e, p) {
  if (e) throw e
  assert.equal(5000, p)
})
getport(start, end, function (e, port) {})getport(6000, 5999, function (e, p) {
  assert.ok(e)
})
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