isit Install $ npm i --save express-isit Usage: app.use(require('express-isit')()) app.get('/', function(req, res){ if(req.isit.facebook){ res.json('Hello, FaceBook') }else{ if(req.itis) res.json("This is: "+req.itis) else res.json("Unknown user agent") }}) Supported User-agents vk.com facebook odnoklassniki.ru