how to fix this error TypeError [ERR_INVALID_CALLBACK]: Callback must be a function

Question

I am a beginner to the nodejs. When I type the below, the code error occurs like this:

TypeError [ERR_INVALID_CALLBACK]: Callback must be a function

Answer 1

Since node 10, it is mandatory to pass a callback on fs.writefile()

Node.js documented the purpose for the change: https://github.com/nodejs/node/blob/master/doc/api/deprecations.md#dep0013-fs-asynchronous-function-without-callback

You could add an empty callback like this fs.writeFile('writeMe.txt', data, () => {})