Node.js Tutorials

Node.js lets you run JavaScript on the server, giving you access to the file system, network sockets, databases, and operating system APIs that browsers restrict. It has become the dominant runtime for build tools (webpack, Vite, esbuild), API servers (Express, Fastify, Hono), and automation scripts across the JavaScript ecosystem. These tutorials cover practical Node.js tasks with tested code examples.

The file operations tutorial covers one of the most common Node.js tasks: moving, copying, and renaming files using the built-in fs module. It shows both the traditional callback API and the modern promise-based fs/promises API, including the cross-device move pattern that handles the EXDEV error when fs.rename fails across filesystem boundaries. It also covers recursive directory copying with the newer fs.cp method introduced in Node 16.7.

File operations are foundational to build systems, deployment scripts, backup automation, data processing pipelines, and content management systems. Understanding the nuances of Node.js file handling — synchronous vs asynchronous, streams vs buffers, error codes, and cross-platform path handling — prevents the subtle bugs that often surface only in production when file volumes increase or paths contain unexpected characters.