find-port
find an unused port in your localhost
var findPort = require('find-port')
// scan a range
findPort(8000, 8003, function(ports) {
console.log(ports)
})
// scan explicitly
findPort([8000, 8011], function(ports) {
console.log(ports)
})
// find first free port in a range
findPort(8000, 8003, true, function(port) {
console.log(port)
})
// find first free port in array
findPort([8000, 8011], true, function(port) {
console.log(port)
})