How can I change a specific line in a file with node js?

Question

I want to change a specific line in a text file using node js with the fs module.

Is there a more elegant way then loading the file into an array?

Old File:

Line 1
Line 2
Line 3

New File:

Line 1
something new
Line 3

Thanks for your replies!

Possible duplicate of [Overwrite a line in a file using node.js](http://stackoverflow.com/questions/11692835/overwrite-a-line-in-a-file-using-node-js) — Relu Mesaros, Jul 04 '16 at 22:28

score 6 · Answer 1 · edited Jun 16 '21 at 08:36

6

Try using this:

var fs = require('fs')
fs.readFile("your file", {encoding: 'utf8'}, function (err,data) {
    var formatted = data.replace(/This is the old line/g, 'This new line replaces the old line');
fs.writeFile("your file", formatted, 'utf8', function (err) {
    if (err) return console.log(err);
 });
});

If this doesn't work, visit https://www.npmjs.com/package/replace-in-file.

edited Jun 16 '21 at 08:36

Norfeldt

8,272
23
96
152

answered Aug 23 '20 at 18:29

Dale

69
1
6

1

Solution given in another question is also helpful https://stackoverflow.com/a/30764806/713573 – Gagan Nov 26 '20 at 09:53

How can I change a specific line in a file with node js?

1 Answers1