In node.js, you can require
fs, and then call
fs.writeFile with the filename, and data to write to that file (as a string or a buffer). That will overwrite the entire file, so to just append that data to the file instead, pass an options object with the
flag key set to
a. Or, you can use
fs.appendFile. Make sure to handle errors using a callback as the last argument to
There are synchronous versions of each function as well,
fs.appendFileSync, which will throw errors, instead of returning them in a callback.