Setup Babel ES6 for Express and Nodejs
Create project and install dependencies
mkidr my-app && cd my-app
npm init -y
npm i -D @babel/cli @babel/core @babel/node @babel/preset-env dotenv
npm i expresss
Create .babelrc
{
"presets": ["@babel/preset-env"]
}
Write a web service
mkdir src/ && touch src/app.js
In app.js
import express from 'express';
const app = express()
const port = 9098
app.get('/', (req, res) => {
res.send('ok')
})
app.listen(port, () => {
console.log(`app listen on port ${port}`)
})
package.json
Include "type": "module" at the root level and add the start script "start": "npx nodemon --exec babel-node src/app.js" inside the scripts section.
{
"name": "my-app",
"version": "1.0.0",
"main": "index.js",
"type": "module",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"start": "npx nodemon -r dotenv/config --exec babel-node src/app.js"
},
"keywords": [],
"author": "",
"license": "ISC",
"description": "",
"dependencies": {
"express": "^4.19.2"
},
"devDependencies": {
"@babel/cli": "^7.24.8",
"@babel/core": "^7.24.9",
"@babel/node": "^7.24.8",
"@babel/preset-env": "^7.24.8"
}
}
Start the project
npm start
curl http://localhost:9098/