hasInternetAccess()

September 9th, 2020 · From Writing a debug script

I needed a way to detect internet access as part of a local Node.js script and it turns out to be a little convoluted as there is no built-in way to do that (which is not too surprising either). The gist is to try resolving the Google DNS (or any other, really but Google felt like a fine choice).

const { promisify } = require('util')
const dns = require('dns')
const resolve = promisify(dns.resolve)

const hasInternetAccess = async () => {
  try {
    await resolve('www.google.com')
    return true
  } catch {
    return false
  }
}