Fox Fox - 5 months ago 49
Node.js Question

Write in a text file without overwriting in fs node js

How I can add text in my file but without overwriting the old text. I use the module fs (node js)

I tried this code but it doesn't work.

fs.writeFileSync("file.txt", 'Text', "UTF-8",{'flags': 'w+'});


any suggestion and Thanks.

Answer

Check the flags here: http://nodejs.org/api/fs.html#fs_fs_open_path_flags_mode_callback - you are currently using w+ which:

'w+' - Open file for reading and writing. The file is created (if it does not exist) or truncated (if it exists).

You should use a instead:

'a' - Open file for appending. The file is created if it does not exist.

'ax' - Like 'a' but opens the file in exclusive mode.

'a+' - Open file for reading and appending. The file is created if it does not exist.

'ax+' - Like 'a+' but opens the file in exclusive mode.