There are a handful of ways you can read and write to the File System in Node.js.

We will look at readFileSync, readFile, and a promise based version of readFile.

Each have there use-cases and we will discuss the pros and cons of each one. For instance readFileSync is a blocking operation which if you were developing a web server with Node.js would be a huge problem. With this project being in the CLI for one user, this is a ok option to consider. On the other hand, readFile is a non-blocking operation that uses promises/callbacks to interact with the file system.