Check for internet connectivity in NodeJs

Question

Installed NodeJS on Raspberry Pi, is there a way to check if the rPi is connected to the internet via NodeJs ?

Answer 1

Since I was concerned with DNS cache in other solutions here, I tried an actual connectivity test using http2. I think this is the best way to test the internet connection as it doesn't send much data and also doesn't rely on DNS resolving alone and it is quite fast.

Note that this was added in: v8.4.0

const http2 = require('http2');

function isConnected() {
  return new Promise((resolve) => {
    const client = http2.connect('https://www.google.com');
    client.on('connect', () => {
      resolve(true);
      client.destroy();
    });
    client.on('error', () => {
      resolve(false);
      client.destroy();
    });
  });
};

isConnected().then(console.log);

Edit: I made this into a package if anyone is interested.