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You can use the built-in fs module in Node.js to write data to a CSV file. Here's an example:

const fs = require('fs');

const data = [
  ['Name', 'Age', 'Country'],
  ['John', 30, 'USA'],
  ['Jane', 25, 'Canada'],
  ['Bob', 40, 'UK'],
];

const csvContent = data.map(row => row.join(',')).join('\n');

fs.writeFile('data.csv', csvContent, (err) => {
  if (err) throw err;
  console.log('Data saved to data.csv');
});

In this example, we're creating an array of arrays that represents the CSV data we want to write. Each inner array represents a row in the CSV file. We're then using the map function to convert each row to a comma-separated string, and then joining all the rows together into a single string with newline characters separating each row.

Finally, we use the writeFile function from the fs module to write the CSV content to a file named data.csv. The callback function is called once the write operation completes, and logs a message to the console.

You can modify this example to use your own data, and customize the file path and name as needed.