npm install raygun

var raygun = require('raygun');
var raygunClient = new raygun.Client().init({ apiKey: 'your API key' });
app.use(raygunClient.expressHandler);

var raygun = require('raygun');
var raygunClient = new raygun.Client().init({ apiKey: 'your API key' });
process.on('uncaughtException', function(err) {
 raygunClient.send(err);
});
 

var domain = require('domain');
var raygun = require('raygun');
var raygunClient = new raygun.Client().init({ apiKey: 'your API key' });
var server = require('http').createServer(function (req, res) {
 var d = domain.create();
 d.on('error', function (err) {
  raygunClient.send(err);
  // clean up and end
 });
 d.add(req);
 d.add(res);
 d.run(function () {
  // handle the req, res
 });
});
server.listen(3000);