Overwrite a line in a file using node.js

Question

What\'s the best way to overwrite a line in a large (2MB+) text file using node.js?

My current method involves

• copying the entire file into a buffer.

Answer 1

Maybe you can try the package replace-in-file

suppose we have a txt file as below, and we want to replace:

line1 -> line3

line2 -> line4

// file.txt
"line1"
"line2"
"line5"
"line6"
"line1"
"line2"
"line5"
"line6"

Then, we can do it like this:

const replace = require('replace-in-file');

const options = {
    files: "./file.txt",
    from: [/path1/g, /path2/g],
    to: ["path3", "path4"]
};

replace(options)
.then(result => {
    console.log("Replacement results: ",result);
})
.catch(error => {
    console.log(error);
});

More details please refer to its docs: https://www.npmjs.com/package/replace-in-file