Introduction

What is vx?

vx is a universal development tool manager that provides a zero learning curve experience for managing programming language runtimes, package managers, and development tools across all platforms.

Instead of learning and configuring multiple tool installers — nvm for Node.js, pyenv for Python, rustup for Rust, gvm for Go — you simply prefix any command with vx and everything just works.

# Just prefix any command with vx — tools are auto-installed
vx node --version        # Auto-installs Node.js if needed
vx python --version      # Auto-installs Python if needed
vx go version            # Auto-installs Go if needed
vx cargo build           # Auto-installs Rust if needed

Why vx?

The Problem

Modern software development requires a complex toolkit:

• Multiple language runtimes — Node.js, Python, Go, Rust, .NET, Java, Zig, etc.
• Package managers — npm, pnpm, yarn, uv, pip, cargo, etc.
• DevOps tools — Terraform, kubectl, Helm, Docker CLI, etc.
• Build tools — CMake, Ninja, Just, Task, protoc, etc.
• Cloud CLIs — AWS CLI, Azure CLI, Google Cloud CLI, etc.

Each tool has its own installer, version manager, and configuration. Teams waste hours debugging "works on my machine" issues.

The Solution

vx provides one tool to manage them all:

Feature	vx	Traditional Approach
Install tools	vx install node@22	Download installer, configure PATH
Use tools	vx node index.js	Hope the right version is active
Switch versions	vx switch node 20	nvm use 20 / fnm use 20 / edit .nvmrc
Team consistency	vx.toml in repo	READMEs, wikis, tribal knowledge
CI/CD	uses: loonghao/vx@main	Multiple setup-* actions

Key Features

Zero Learning Curve

Use commands you already know — just add vx in front:

vx npm install           # Same as npm install, but version-managed
vx uvx ruff check .      # Same as uvx ruff check, but auto-installed
vx go build ./...        # Same as go build, but portable

50+ Tools Supported

From language runtimes to DevOps tools, vx manages them all with a single interface. See the full tool list.

Declarative Configuration

Define your project's toolchain in vx.toml:

[tools]
node = "22"
python = "3.12"
uv = "latest"
just = "latest"

Automatic Dependency Resolution

vx understands tool dependencies and installs them automatically:

vx npm --version         # Automatically installs Node.js first
vx cargo build           # Automatically installs Rust first
vx uvx ruff check .      # Automatically installs uv first

Enhanced Script System

Define and run project scripts with powerful variable interpolation:

[scripts]
dev = "vx node server.js --port {{PORT}}"
test = "vx uv run pytest {{args}}"
build = "vx cargo build --release"
lint = "vx uvx ruff check . {{args}}"

Cross-Platform

Works on Windows, macOS, and Linux with consistent behavior.

Extensible

Create custom providers via TOML manifests or Rust plugins, and extend functionality with the extension system.

How It Works

┌─────────────┐    ┌─────────────┐    ┌──────────────┐
│  vx node    │───>│  Resolver   │───>│  Provider    │
│  --version  │    │  (find tool │    │  (install &  │
│             │    │   & deps)   │    │   execute)   │
└─────────────┘    └─────────────┘    └──────────────┘
                         │                    │
                   ┌─────▼─────┐    ┌────────▼────────┐
                   │ Version   │    │ Content-Addressed│
                   │ Resolution│    │ Store (~/.vx/)   │
                   └───────────┘    └─────────────────┘

1. Parse — vx identifies the runtime and command
2. Resolve — Finds the required version and checks dependencies
3. Install — Downloads and installs missing tools (if needed)
4. Execute — Forwards the command transparently

Quick Example

# Install vx
curl -fsSL https://raw.githubusercontent.com/loonghao/vx/main/install.sh | bash

# Use any tool immediately — no manual setup
vx node --version        # v22.x.x
vx python --version      # Python 3.12.x
vx go version            # go1.23.x

# Set up a project
cd my-project
vx config init           # Creates vx.toml
vx setup                 # Installs all project tools

# Run project scripts
vx run dev               # Starts dev server
vx run test              # Runs tests

Next Steps

• Installation — Install vx on your system
• Quick Start — Get up and running in 5 minutes
• Core Concepts — Understand how vx works
• CLI Reference — Complete command documentation