Using the request-ip package to actually find the IP of the request.

Live example: https://ripal.klmntn.com/

Like ipify.org, there are three APIs provided:

1. Plaintext at /api/text
2. JSON at /api/json
3. JSONP (with custom defined callback) at /api/jsonp/customCallbackName

Curl:

$ curl https://ripal.klmntn.com/api/text

Wget:

$ wget -qO- https://ripal.klmntn.com/api/text