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Node.js Hello World

Create a file named index.js with the following content:

const express = require('express');
const app = express();
const port = process.env.PORT || 3000;


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


app.listen(port, () => {
  console.log(`Server running on port ${port}`);
});

Install dependencies and run it locally:

Terminal window
npm init -y && npm install express
node index.js
Terminal window
curl http://localhost:3000
# {"message":"Hello World"}

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