greenlock-express.js/examples/my-express-app.js

'use strict';

var express = require('express');
var app = express();

app.use('/', function (req, res) {
  res.setHeader('Content-Type', 'text/html; charset=utf-8');
  res.end('Hello, World!\n\n💚 🔒.js');
});

// DO NOT DO app.listen() unless we're testing this directly
if (require.main === module) { app.listen(3000); }

// Instead do export the app:
module.exports = app;