What data formats or documentation have you had to work with?

In working with Node.js, it is often necessary to interact with different data formats and documentation, such as:

• JSON — the main data exchange format in web applications, used for transmitting data between client and server.
• YAML — sometimes used for configuration files.
• XML — less common, but can be used for integration with external services.
• Markdown — a documentation format, for example, for README files.
• Swagger/OpenAPI — specifications for describing REST APIs.

Example of reading JSON in Node.js:

const fs = require('fs');

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