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npm install request-ip
const requestIp = require('request-ip');
// inside middleware handler
const ipMiddleware = function(req, res, next) {
const clientIp = requestIp.getClientIp(req);
next();
};
// on localhost you'll see 127.0.0.1 if you're using IPv4
// or ::1, ::ffff:127.0.0.1 if you're using IPv6