Based on mod_cloudflare.c, this ExpressJS middleware will replace the IP variable with the correct remote IP sent from CloudFlare.
To install, simple run:
npm install mod_cloudflare --save
const express = require('express')
const app = express()
const mod_cloudflare = require('mod_cloudflare');
app.use(mod_cloudflare());
app.get('/', function (req, res) {
res.send(`Your IP is: {$req.ip}`);
})
app.listen(3000);By default mod_cloudflare will still accept non-cloudflare connections. This can be changed by passing an object with the desired options to the mod_cloudflare constructor.
| Option | Default Setting | Description |
|---|---|---|
| CloudFlareRemoteIPHeader | "CF-Connecting-IP" |
The header which contains the original IP. |
| DenyAllButCloudflare | false |
Deny all requests that aren't sent via CloudFlare. |
| CloudFlareRemoteIPTrustedProxy | [ ] |
Additional array of IP addresses or ranges which are to be treated as CloudFlare IPs. |
| ForbiddenPage | null |
Only served to denied clients. The path to serve as 403 FORBIDDEN page. |