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.
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I know this question had already been answered, but if anyone needs more information on how to read/write files with node just check out this tutorial: 4dev.tech/2015/09/node-js-tutorial-reading-and-writing-filesLeonardo Jines– Leonardo Jines2015-09-12 19:53:53 +00:00Commented Sep 12, 2015 at 19:53
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2 Answers
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.
3 Comments
dardar.moh
Thank you for ur answer, I found a solution, I use this code :
fs.appendFileSync("file.txt", 'My Text \n', "UTF-8",{'flags': 'a+'});
Alexander Mills
this doesn't seem to explain how to avoiding writing to a file if it already exists...?
Tim
NOTE: On Linux, positional writes don't work when the file is opened in append mode. The kernel ignores the position argument and always appends the data to the end of the file.
Use fs.appendFile, that will just append the new information!
fs.appendFile("file.txt", 'Text',function(err){
if(err) throw err;
console.log('IS WRITTEN')
});