Read File Line By Line With Node.js

September 19, 2023 by Andreas Wik

It’s quick and easy to read a file line by line With Node.js.

First, import the modules needed.

const readline = require('readline');
const fs = require('fs');


Then create a readline interface and provide the file you want to read, in my case bickbeck-missp.dat).

const readInterface = readline.createInterface({
    input: fs.createReadStream('birkbeck-missp.dat'),
    output: process.stdout,
    console: false


The following lets you do whatever it is you need to for each line:

readInterface.on('line', function(line) {


That’s it, hope it helps!

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