Express 3.x - Referencia de API

3.x API

This section provides an overview of the modules and APIs available in Express 3.x for building web applications and HTTP services.

express()

The express() function, exported by the express module, creates and returns a new application instance that serves as the foundation for defining routes, configuring middleware, and handling HTTP requests.

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

app.get('/', function (req, res) {
  res.send('hello world');
});

app.listen(3000);

After creating an application instance, you can define routes, configure middleware, and start handling HTTP requests