How to append to a file in Node?

Question

I am trying to append a string to a log file. However writeFile will erase the content each time before writing the string.

fs.writeFile(\'log.txt\'         


        

Answer 1

const inovioLogger = (logger = "") => {
    const log_file = fs.createWriteStream(__dirname + `/../../inoviopay-${new Date().toISOString().slice(0, 10)}.log`, { flags: 'a' });
    const log_stdout = process.stdout;
    log_file.write(logger + '\n');
}