What Is the Node.js fs (File System) Module?

The built-in Node.js file system module helps us store, access, and manage data on our operating system. Commonly used features of the fs module include fs.readFile to read data from a file, fs.writeFile to write data to a file and replace the file if it already exists, fs.watchFile to get notified of changes, and fs.appendFile to append data to a file. The fs core module is available in every Node.js project without having to install it.

By the end of this tutorial, you should be able to:

  • Understand common uses for the Node file system module
  • Learn about relative file paths when using the fs module
  • Asynchronous vs synchronous fs methods in Node
  • Have a good overview of the new promise-based version of the fs module
  • Understand when we can’t rely on the Node fs module
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