schniz/fnm

fnm (Fast Node Manager) is a command-line tool that lets you install and switch between multiple versions of Node.js on the same computer. Node.js is the runtime that lets you run JavaScript outside of a browser, and different projects often require different versions of it. Without a version manager, you can only have one version installed at a time, which causes conflicts when working across projects. fnm solves this by letting you install any version of Node.js and switch between them instantly from the terminal. It can automatically detect which version a project needs by reading a ".node-version" or ".nvmrc" file in the project's folder, so when you navigate into a project directory, fnm can switch to the right Node.js version automatically. This makes working on multiple projects with different Node.js requirements seamless. The main selling point over older alternatives is speed, fnm is built in Rust, a compiled systems programming language, making it significantly faster to start up and execute commands. It works on macOS, Windows, and Linux, and integrates with bash, zsh, fish, and PowerShell shells. You would use fnm if you are a JavaScript or Node.js developer who works on multiple projects and needs a fast, reliable way to manage Node.js versions. It is installed via a script, Homebrew, Winget, Scoop, Chocolatey, or Cargo.