Question

78

Overwrite a File in Node.js

rated 0 times [ 82] [ 4] / answers: 1 / hits: 17180 / 8 Years ago, wed, february 3, 2016, 12:00:00

Im trying to write into a text file in node.js.
Im doing this the following way:

fs.writeFile(persistence\announce.txt, string, function (err) {

    if (err) {

        return console.log(Error writing file:  + err);

    }

});

whereas string is a variable.

This function will begin it`s writing always at the beginning of a file, so it will overwrite previous content.

I have a problem in the following case:

old content:

Hello Stackoverflow

new write:

Hi Stackoverflow

Now the following content will be in the file:

Hi stackoverflowlow

The new write was shorter then the previous content, so part of the old content is still persistent.

My question:

What do I need to do, so that the old content of a file will be completely removed before the new write is made?

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masonm

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answered 8 Years ago frankiebobbyc · Accepted Answer

You can try truncating the file first:

fs.truncate(persistence\announce.txt, 0, function() {

    fs.writeFile(persistence\announce.txt, string, function (err) {

        if (err) {

            return console.log(Error writing file:  + err);

        }

    });

});