Writing into file in nodejs using fs.writefilesync

Question

I am trying to write into a file using fs.writeFileSync('notes.json', originalNoteString) . When I run the program first time it is appending but when I run the program second time it is not appending again. Can Anyone help me what is happening here.

const fs = require('fs');

let orginalNote = {
    title: 'sometitle',
    body: 'somebody'
}

let originalNoteString = JSON.stringify(orginalNote);

fs.writeFileSync('notes.json', originalNoteString);

let noteString = fs.readFileSync('notes.json');

let note = JSON.parse(noteString);

console.log(typeof note);
console.log(note.title);

writeFileSync will overwrite file contents by default. For appending you should use appendFileSync nodejs.org/api/fs.html#fs_fs_appendfilesync_path_data_options — Bartosz Gościński
– Bartosz Gościński, Commented Sep 18, 2018 at 18:47

Batajus · Accepted Answer · 2023-11-27 08:37:53Z

3

The default mode of fs.writeFileSync is overwrite the complete file. As @Bartosz Gościński mentioned you can use appendFileSync or you set an option in writeFileSync to append the new text:

fs.writeFileSync('notes.json', originalNoteString, {flag: 'a'});

For more different flag values see here

edited Nov 27, 2023 at 8:37

answered Sep 18, 2018 at 18:50

Batajus

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2 Comments

Betty Over a year ago

What is fileWriteSync? Did you mean writeFileSync?

Batajus Over a year ago

@Betty oh didn't see that. Thank you for pointing out :)

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