Check if servers are reachable

Works in Node.js and the browser (with a bundler).

The Node.js version will do a TCP handshake with the target's port. It attempts to detect cases where a router redirects the request to itself.

The browser version is limited by the fact that browsers cannot connect to arbitrary ports. It only supports HTTP and HTTPS and the check relies on the /favicon.ico path being present.

$ npm install is-reachable

const isReachable = require('is-reachable');

(async () => {
	console.log(await isReachable('sindresorhus.com'));
	//=> true

	console.log(await isReachable('google.com:80'));
	//=> true
})();

Returns a Promise for a boolean which is true if any of the targets are reachable.

Type: string string[]

One or more targets to check. Can either be a full URL like https://hostname, hostname:port or just hostname. When the protocol is missing from a target http is assumed.

Well-known protocols are supported (e.g. ftp://, mysql://, redis:// and more).

Type: Object

Type: number

Timeout in milliseconds after which a request is considered failed. Default: 5000.

• silverwind

• is-online - Check if the internet connection is up

MIT © Sindre Sorhus