How to return an array of lines from a file in node.js ?

In this article, we will return an array of lines from a specified file using node.js. The fs module is used to deal with the file system in node.js and to read file data we use fs.readFileSync( ) or fs.readFile( ) methods. Here we will use the readFileSync method to read the file, and we use the steps below to return the lines of the file in an array:

• Read the data of the file using the fs.readFileSync method, you will get a Buffer
• Convert the Buffer into a string Using the toString( ) method
• Now use the String.split() method to break the data and the delimiter should be “\n”

Below is the Example in which we are implementing the above steps:

Javascript

// Requiring the fs module
const fs = require("fs")

// Creating a function which takes a file as input
const readFileLines = filename =>
  fs
    .readFileSync(filename)
    .toString('UTF8')
    .split('\n');


// Driver code
let arr = readFileLines('gfg.txt');

// Print the array
console.log(arr);

Text file: The gfg.txt file.

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Run the code using the command:

node index.js

Output:

[
  'Geeksforgeeks',
  'A computer Science Portal for Geeks'
]