Express: Hello World!

README.md

Express: Add "Hello World!" API

Prerequisites

1. Initialized ExpressJS project as per this gist

Example directory structure

project-root
    ├── node_modules
    ├── package-lock.json
    ├── package.json
    └── server.js

Instructions

1. In your favourite editor (VSCode), open the file server.js

2. At the bottom of the file, add endpoint (an API!) handler for GET / requests (i.e. the "home" of our ExpressJS server):

   app.get('/', (request, response) => {
     response.send('Hello World!')
   })

3. Open a browser and go to the address: http://localhost:4000/

   • you should see 'Hello World!' displayed

Related Gists

• Express: Catch 404 Not Found errors
• Express: Serving static files

package.json

{
  "name": "hello-express",
  "version": "1.0.0",
  "description": "An introductory express app",
  "main": "server.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "Tony Grimes",
  "license": "MIT",
  "dependencies": {
    "express": "^4.17.1"
  }
}

server.js

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

const PORT = process.env.PORT || 3000;

app.listen(PORT, function() {
  console.log(`Example app listening at http://localhost:${PORT}`);
})

app.get('/', (request, response) => {
  response.send("Hello World!");
})