Sometimes, we want to append to new line in Node.js.

In this article, we’ll look at how to append to new line in Node.js.

How to append to new line in Node.js?

To append to new line in Node.js, we can use the write method with the os.EOL constant.

For instance, we write

const os = require("os");
const fs = require("fs");

fs.open('./log.txt', 'a', 666, (e, id) => {
  fs.write(id, text + os.EOL, null, 'utf8', () => {
    fs.close(id, () => {
      console.log('file is updated');
    });
  });
});

to call fs.open to open the ./log.txt file with 666 file permission and 'a' for append.

Then we call fs.write with the text appended with the os.EOL character, which is the new line character for the platform the app is running on.

Then we call fs.close to close the file handle given by id.