Hello World
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| const express = require('express')
const app = express()
const port = 3000
app.get('/', (req, res) => res.send('Hello World!'))
app.listen(port, () => console.log(`Example app listening at http://localhost:${port}`))
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Generator
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| ├── app.js
├── bin
│ └── www
├── package.json
├── public
│ ├── images
│ ├── javascripts
│ └── stylesheets
│ └── style.css
├── routes
│ ├── index.js
│ └── users.js
└── views
├── error.jade
├── index.jade
└── layout.jade
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Basic routing
Each route can have one or more handler functions, which are executed when the route is matched.
Route definition takes the following structure:
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| app.METHOD(PATH, HANDLER)
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Serving static files
To serve static files such as images, CSS files, and JavaScript files, use the express.static
built-in middleware function in Express.
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| express.static(root, [options])
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To use multiple static assets directories, call the express.static middleware function multiple times:
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| app.use(express.static('public'))
app.use(express.static('files'))
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If you run the express app from another directory, it’s safer to use the absolute path of the directory that you want to serve:
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| app.use('/static', express.static(path.join(__dirname, 'public')))
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