Ansis is a small and fast JavaScript library for adding ANSI colours and text styles to terminal output. It works in terminals, continuous integration environments and Chromium-based browsers.
The library supports chainable styles and tagged template literals, including nested templates. It automatically detects colour support and falls back gracefully when true colour or 256-colour output is unavailable.
This is free and open source software.
Key Features
- Supports standard 16-colour ANSI output, 256 colours and true colour.
- Specifies foreground and background colours using hexadecimal or RGB values.
- Provides bold, dim, italic, underline, strikethrough, inverse, hidden and other text styles.
- Combines colours and styles using a chainable syntax.
- Supports tagged template literals and deeply nested templates.
- Automatically detects the available colour level.
- Falls back from true colour to 256 colours, 16 colours or uncoloured output.
- Honours the NO_COLOR, FORCE_COLOR and COLORTERM environment variables.
- Recognises command-line flags for enabling or disabling colour output.
- Provides functions for stripping ANSI escape sequences and creating terminal hyperlinks.
- Supports ESM, CommonJS and TypeScript.
- Works with Node.js, Bun, Deno, CI services and Chromium-based browsers.
- Can act as a drop-in replacement for Chalk and several other terminal styling libraries.
Website: github.com/webdiscus/ansis
Support:
Developer: webdiscus
License: ISC License
Ansis is written in JavaScript. Learn JavaScript with our recommended free books and free tutorials.
Related Software
| Terminal String Styling Libraries | |
|---|---|
| color | Go package for adding colour to terminal output |
| termenv | Advanced ANSI styling and terminal rendering for Go |
| owo_colors | Zero-allocation terminal colour library for Rust |
| Ansis | Small, fast library for styling terminal text |
| anstyle | Rust libraries for ANSI text styling |
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