lesson

Express.js Framework

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40 minlesson

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1 min read

Express.js Basics

Express is a minimal web framework for Node.js. You create an app, define routes, and listen on a port.

const express = require('express')
const app = express()

app.get('/', (req, res) => {
  res.json({ message: 'Hello!' })
})
// ...

Route parameters

app.get('/users/:id', (req, res) => {
  res.json({ userId: req.params.id })
})

Request body (JSON)

app.use(express.json()) // parse JSON bodies

app.post('/echo', (req, res) => {
  res.json(req.body)
})

You completed the free preview — you are ready for the full path.

All lessons are readable below. To write and run code from lesson 11 onwards, upgrade to Path Plus ($9/mo) or Pro.

1 min read

Express is a minimal web framework for Node.js. You create an app, define routes, and listen on a port.

const express = require('express')
const app = express()

app.get('/', (req, res) => {
  res.json({ message: 'Hello!' })
})
// ...

Route parameters

app.get('/users/:id', (req, res) => {
  res.json({ userId: req.params.id })
})

Request body (JSON)

app.use(express.json()) // parse JSON bodies

app.post('/echo', (req, res) => {
  res.json(req.body)
})

1 min read

Express is a minimal web framework for Node.js. You create an app, define routes, and listen on a port.

const express = require('express')
const app = express()

app.get('/', (req, res) => {
  res.json({ message: 'Hello!' })
})
// ...

Route parameters

app.get('/users/:id', (req, res) => {
  res.json({ userId: req.params.id })
})

Request body (JSON)

app.use(express.json()) // parse JSON bodies

app.post('/echo', (req, res) => {
  res.json(req.body)
})

1 min read

Express is a minimal web framework for Node.js. You create an app, define routes, and listen on a port.

const express = require('express')
const app = express()

app.get('/', (req, res) => {
  res.json({ message: 'Hello!' })
})
// ...

Route parameters

app.get('/users/:id', (req, res) => {
  res.json({ userId: req.params.id })
})

Request body (JSON)

app.use(express.json()) // parse JSON bodies

app.post('/echo', (req, res) => {
  res.json(req.body)
})