fs.writeFile (node) adds information on an already existing file instead of replacing this

Question

I made a code to write a file using fs and node-cron to run this every x minutes. I get the data the first time, but in the next job I get the data added again in the file and the old one too, I wan to create a new file and replace the old one (and the previous information) but I still have this appended instead of only the new data,

fs.writeFile(path.join(__dirname, '_data', 'data.json'), JSON.stringify(data, this, 2), {flag: 'w'}, err => {
    if (err) {
        console.error(err);
    } else {
        console.log("Success");
    }
});

fs.writeFile() will overwrite an existing file, so are you sure that data doesn't contain the old data? Also, is there a reason you're passing this as second argument to JSON.stringify()? — robertklep
– robertklep, Commented May 28, 2022 at 6:20

Mariano Bordon · Accepted Answer · 2022-05-31 05:08:00Z

0

I was able to understand my error, I should initialize again variable data in order to clear previous results.

    //Save data into fs
    fs.writeFile(path.join(__dirname, '_data', 'varlix.json'), JSON.stringify(varlix, this, 2), err => {
        if (err) {
            console.error(err);
        } else {
            console.log("Success");
        }
    });
    data = [];

answered May 31, 2022 at 5:08

Mariano Bordon

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