app.get('/hook', function (req, res) {

        url='https://api.telegram.org/bot17xxxxx/setwebhook?url=https://example.com/hook'
            request(url, function (error, response, body) {
                    if (!error && response.statusCode == 200) {
                console.log(body)
              }
            response.emit('close');
            });
    });

{"ok":true,"result":true,"description":"Webhook was set"}

app.post("/hook", function(req, res) {
            console.log(body);

});