What type of data or format was used in this work?

In working with Node.js, data formats like JSON and JavaScript objects are frequently used because they integrate naturally with the language. JSON (JavaScript Object Notation) is a text format for data exchange that is easily parsed and generated in Node.js.

For example, when working with APIs or reading files, JSON is often used:

const fs = require('fs');

// Reading a JSON file
fs.readFile('data.json', 'utf8', (err, data) => {
  if (err) throw err;
  const obj = JSON.parse(data);
  console.log(obj);
});

JSON is also the standard for data transfer between server and client, making it the primary format in most Node.js projects.