Awesome

cloudflare-detect

Detect whether a site is running behind Cloudflare.

Install

npm install --save cloudflare-detect

Note that versions > 2 of this package are ESM-only. Use 1.x for CommonJS support.

Usage

const cloudflareDetect = require('cloudflare-detect');

cloudflareDetect('nikolaskama.me').then(cf => {
	console.log(cf);
	//=> true
});

cloudflareDetect('google.com').then(cf => {
	console.log(cf);
	//=> false
});

API

cloudflareDetect(targets, [options])

Returns a Promise for a boolean which is true if any of the targets are running behind Cloudflare.

targets

Type: string Array

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

options

timeout

Type: number

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

Credits

cloudflare-ip - a lot of the code for verifying that the host's IP address is within Cloudflare's range has been adapted from this repo (which doesn't seem to be maintained anymore) by danneu.
is-reachable - some of the IP verification & DNS lookup code, as well as the format of the readme file, has been adapted from this repo by sindresorhus.

Contributors

Michael Bianco