TCP ping utility for node.js. You can test if chosen address accepts connections at desired port and find out your latency. Great for service availability testing.

• It's much faster than ping tool (as soon as connection gets accepted, it's dropped and a new measure is conducted immediately), so there's no unnecessary waiting between requests.
• It allows you to test a specific service, not the whole connection
• Some servers drop ICMP echo without any response, even when online. TCP can work in such cases.

npm install tcp-ping

options is an object, which may contain several properties:

• address (address to ping; defaults to localhost)
• port (defaults to 80)
• timeout (in ms; defaults to 5s)
• attempts (how many times to measure time; defaults to 10)

callback should be a function with arguments in node convention - function(err, data).

Returned data is an object which looks like this:

{
  address: '46.28.246.123',
  port: 80,
  attempts: 10,
  avg: 19.7848844,
  max: 35.306233,
  min: 16.526067,
  results:
   [
    { seq: 0, time: 35.306233 },
    { seq: 1, time: 16.585919 },
    ...
    { seq: 9, time: 17.625968 }
   ]
}

callback is a node style callback function(err, data), where data is true if the server is available and false otherwise.

var tcpp = require('tcp-ping');

tcpp.probe('46.28.246.123', 80, function(err, available) {
    console.log(available);
});

tcpp.ping({ address: '46.28.246.123' }, function(err, data) {
    console.log(data);
});