cac
A lightweight, dependency-free JavaScript library for building command-line applications with TypeScript support.
What is cac?
CAC is a JavaScript library designed for building command-line applications. It simplifies CLI development by providing a clean API for parsing command-line arguments, defining commands and options, and generating help messages. It solves the problem of creating robust, user-friendly CLI tools with minimal code and no dependencies.
Node.js and Deno developers who need to build command-line interfaces for tools, scripts, or applications, especially those valuing simplicity and TypeScript support.
Developers choose CAC for its zero-dependency design, intuitive API, and powerful features like dot-nested options and subcommand support, offering a lighter and more flexible alternative to heavier CLI frameworks.
Overview
Simple yet powerful framework for building command-line apps.
Use Cases
Best For
- Creating lightweight CLI tools with no external dependencies
- Building TypeScript-based command-line applications
- Implementing git-like subcommands in Node.js scripts
- Parsing complex command-line arguments with validation
- Generating automated help messages for CLI tools
- Developing Deno CLI applications with JavaScript/TypeScript
Not Ideal For
- Projects requiring interactive CLI elements like prompts, spinners, or auto-completion
- Large-scale CLI applications needing built-in configuration file parsing or plugin ecosystems
- Teams prioritizing extensive community support and third-party integrations over minimalism
Pros & Cons
Pros
A single file with no external dependencies, keeping bundles minimal and reducing maintenance overhead, as highlighted in the README's feature list.
Only four core APIs (option, version, help, parse) are needed for basic CLIs, making it easy to learn and deploy quickly, as demonstrated in the usage examples.
Supports complex patterns like git-like subcommands, dot-nested options, and variadic arguments, enabling flexible CLI design without bloat.
Written in TypeScript, offering excellent type safety and developer experience out of the box, with seamless Deno support via imports.
Cons
Lacks built-in support for common CLI enhancements like prompts, progress bars, or auto-completion, requiring manual implementation for interactive tools.
Error handling requires explicit try-catch blocks and custom logic, as shown in the README example, which can be verbose compared to frameworks with more automation.
Being minimalist, it has fewer third-party extensions and a smaller community than alternatives like Commander.js, limiting out-of-the-box solutions for complex needs.
Open Source Alternative To
cac is an open-source alternative to the following products:
Frequently Asked Questions
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