Hello Express

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Requirements

Start our first Express project, Hello Express! To practice our very basic skills building simple REST API with Node.js

Input

• Various programs we built before

Process

• Install Express on your project -

Output

• REST API that can handle basic HTTP methods

  • GET
  • POST
  • PUT
  • DELETE

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Level 0

• Initialize your node project first

npm init

• Always remember to ignore node_modules

echo node_modules > .gitignore

• Install Express using npm or yarn

# using npm
npm i express
# using yarn
yarn add express

• Create a basic Express app in index.js

const express = require("express")
const app = express()

app.get("/", function (req, res) {
  res.send("Hello World!")
})

app.listen(3000, function () {
  console.log("Example app listening on port 3000!")
})

• Create a start script in package.json

{
  ...
  "scripts": {
    "start": "node index"
  }
  ...
}

• Test if that works

npm start

• Awesome!

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Level 1

• Read the documentation on Express
• Start to implement various REST API routes/requests: GET, POST, PUT, DELETE
• Congrats!

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Level 2

• Compare between res.send/res.json and res.render
• Response with either JSON or webpage

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Level 3

• Explore with Express application generator