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

I wrapped the async fs.appendFile into a Promise-based function. Hope it helps others to see how this would work.

    append (path, name, data) {

        return new Promise(async (resolve, reject) => {

            try {

                fs.appendFile((path + name), data, async (err) => {

                    if (!err) {

                        return resolve((path + name));

                    } else {

                        return reject(err);

                    }

                });

            } catch (err) {

                return reject(err);

            }

        });

    }