readFileLines javascript Code Snippet in 2025

Returns an array of lines from the specified file.

• Use fs.readFileSync() to create a Buffer from a file.
• Convert buffer to string using buf.toString(encoding) function.
• Use String.prototype.split(\n) to create an array of lines from the contents of the file.

const fs = require('fs');

const readFileLines = filename =>
  fs
    .readFileSync(filename)
    .toString('UTF8')
    .split('\n');

/*
contents of test.txt :
  line1
  line2
  line3
  ___________________________
*/
let arr = readFileLines('test.txt');
console.log(arr); // ['line1', 'line2', 'line3']