Fast Node Manager (fnm)

🚀 Fast and simple Node.js version manager, built in Rust

Features

🌎 Cross-platform support (Mac, Windows, Linux)

✨ Single file, easy installation, instant startup

🚀 Built with speed in mind

🤔 Works with .node-version and .nvmrc files

Installation

Using a script (MacOS/Linux)

For bash, zsh and fish shells, there's an automatic installation script:

curl -fsSL https://fnm.vercel.app/install | bash

Upgrade

On OSX, it is a simple as brew upgrade fnm.

On other operating systems, upgrading fnm is almost the same as installing it. To prevent duplication in your shell config file add --skip-shell to install command.

Parameters

--install-dir

Set a custom directory for fnm to be installed. The default is $HOME/.fnm.

--skip-shell

Skip appending shell specific loader to shell config file, based on the current user shell, defined in $SHELL. e.g. for Bash, $HOME/.bashrc. $HOME/.zshrc for Zsh. For Fish - $HOME/.config/fish/conf.d/fnm.fish

--force-install

MacOS installations using the installation script are deprecated in favor of the Homebrew formula, but this forces the script to install using it anyway.

Example:

curl -fsSL https://fnm.vercel.app/install | bash -s -- --install-dir "./.fnm" --skip-shell

Manually

Using Homebrew (OSX)

brew install fnm

Then, set up your shell for fnm

Using Scoop (Windows)

scoop install fnm

Then, set up your shell for fnm

Using Cargo (Linux/Mac/Windows)

cargo install fnm

Then, set up your shell for fnm

Using a release binary (Linux/Mac/Windows)

• Download the latest release binary for your system
• Make it available globally on PATH environment variable
• Configure your shell profile:

Completions

fnm ships its completions with the binary:

fnm completions --shell <SHELL>

Where <SHELL> can be one of the supported shells:

• bash
• zsh
• fish
• powershell

Please follow your shell instructions to install them.

Shell Setup

fnm needs to run some shell commands before you can start using it. This is done by evaluating the output of fnm env. Check out the following guides for the shell you use:

Bash

add the following to your .bashrc profile:

eval "$(fnm env)"

Zsh

add the following to your .zshrc profile:

eval "$(fnm env)"

Fish shell

create ~/.config/fish/conf.d/fnm.fish add this line to it:

fnm env | source

PowerShell

add the following to the end of your profile file::

fnm env --use-on-cd | Out-String | Invoke-Expression

• On Windows, the profile is located at ~\Documents\PowerShell\Microsoft.PowerShell_profile.ps1
• For Mac/Linux, the profile is located at ~/.config/powershell/Microsoft.PowerShell_profile.ps1

Windows Command Prompt aka Batch aka WinCMD

fnm is also supported but is not entirely covered. You can set up a startup script and append the following line:

FOR /f "tokens=*" %i IN ('fnm env --use-on-cd') DO CALL %i

Usage

Global Options

fnm [--shell=fish|bash|zsh] [--node-dist-mirror=URI] [--fnm-dir=DIR] [--log-level=quiet|error|info] <command>

• Providing --shell=fish will output the Fish-compliant version. Omitting it and fnm will try to infer the current shell based on the process tree
• Providing --node-dist-mirror="https://npm.taobao.org/dist" will use the Chinese mirror of Node.js
• Providing --fnm-dir="/tmp/fnm" will install and use versions in /tmp/fnm directory

You can always use fnm --help to read the docs:

fnm install [VERSION]

Installs [VERSION]. If no version provided, it will install the version specified in the .node-version or .nvmrc files located in the current working directory.

fnm install --lts

Installs the latest LTS version of Node

fnm use [VERSION]

Activates [VERSION] as the current Node version. If no version provided, it will activate the version specified in the .node-version or .nvmrc file located in the current working directory.

Flags

• --install-if-missing — installs the version if it isn't installed yet

fnm current

Display currently activated Node version.

fnm list

Lists the installed Node versions.

fnm list-remote

Lists the Node versions available to download remotely.

fnm uninstall [VERSION]

Uninstalls the node version specified in [VERSION].

fnm alias [VERSION] [NAME]

Aliases a Node version to a given name.

fnm default [VERSION]

Aliases a Node version as default. Uses fnm alias underneath.

fnm env

Prints the required shell commands in order to configure your shell, Bash compliant if can't infer the shell. This command is highly influenced by the global options

Options:

• --use-on-cd will also output a script that will automatically change the node version if a .node-version/.nvmrc file is found

Contributing

PRs welcome 🎉

Developing:

# Install Rust
git clone https://github.com/Schniz/fnm.git
cd fnm/
cargo build

Running Binary:

cargo run -- --help # Will behave like `fnm --help`

Running Tests:

cargo test