# chartjs2img

> Server-side Chart.js rendering service (v0.3.0). CLI + HTTP API that takes a Chart.js configuration JSON and returns a PNG/JPEG/WebP image via headless Chromium. Bundles Chart.js 4.4 + 12 ecosystem plugins. Built for contexts without a browser (email, PDF, slides) and for LLM agents that write Chart.js configs.

The `chartjs2img` binary exposes `serve` (HTTP API), `render` (one-shot CLI), `examples` (render the built-in gallery), and `llm` (dump the Chart.js + plugin reference as Markdown for agent context).

## Home

- [chartjs2img](https://chartjs2img.ideamans.com/en.md)

## User Guide

- [Quick start](https://chartjs2img.ideamans.com/en/guide.md)
- [CLI rendering](https://chartjs2img.ideamans.com/en/guide/cli.md)
- [Environment variables (CLI)](https://chartjs2img.ideamans.com/en/guide/cli/env-vars.md)
- [Error feedback (CLI)](https://chartjs2img.ideamans.com/en/guide/cli/error-feedback.md)
- [HTTP server](https://chartjs2img.ideamans.com/en/guide/http.md)
- [Authentication](https://chartjs2img.ideamans.com/en/guide/http/auth.md)
- [Cache](https://chartjs2img.ideamans.com/en/guide/http/cache.md)
- [Docker](https://chartjs2img.ideamans.com/en/guide/http/docker.md)
- [Environment variables (HTTP server)](https://chartjs2img.ideamans.com/en/guide/http/env-vars.md)
- [Error feedback (HTTP)](https://chartjs2img.ideamans.com/en/guide/http/error-feedback.md)
- [Install](https://chartjs2img.ideamans.com/en/guide/install.md)
- [Bundled plugins](https://chartjs2img.ideamans.com/en/guide/plugins.md)

## Developer Guide

- [Developer Guide](https://chartjs2img.ideamans.com/en/developer.md)
- [Adding LLM docs](https://chartjs2img.ideamans.com/en/developer/adding-llm-doc.md)
- [Adding a Chart.js plugin](https://chartjs2img.ideamans.com/en/developer/adding-plugin.md)
- [Architecture](https://chartjs2img.ideamans.com/en/developer/architecture.md)
- [Error handling](https://chartjs2img.ideamans.com/en/developer/error-handling.md)
- [Library API (TypeScript)](https://chartjs2img.ideamans.com/en/developer/library-api.md)
- [Modules](https://chartjs2img.ideamans.com/en/developer/modules.md)
- [Types & HTTP schema](https://chartjs2img.ideamans.com/en/developer/types.md)

## AI Guide

- [AI Guide](https://chartjs2img.ideamans.com/en/ai.md)
- [Claude Code plugin](https://chartjs2img.ideamans.com/en/ai/claude-plugin.md)
- [chartjs2img llm](https://chartjs2img.ideamans.com/en/ai/cli.md)
- [context7 (MCP retrieval)](https://chartjs2img.ideamans.com/en/ai/context7.md)
- [gh skill (Copilot / Cursor / Gemini CLI / Codex)](https://chartjs2img.ideamans.com/en/ai/gh-skill.md)
- [llms.txt](https://chartjs2img.ideamans.com/en/ai/llms-txt.md)

## Gallery

- [Gallery](https://chartjs2img.ideamans.com/en/gallery.md)
- [Axes & chart options](https://chartjs2img.ideamans.com/en/gallery/axes-options.md)
- [Basic chart types](https://chartjs2img.ideamans.com/en/gallery/basic.md)
- [Composite charts](https://chartjs2img.ideamans.com/en/gallery/composite.md)
- [Labels & annotation](https://chartjs2img.ideamans.com/en/gallery/decorations.md)
- [Exotic plugins](https://chartjs2img.ideamans.com/en/gallery/exotic.md)
- [Internationalization](https://chartjs2img.ideamans.com/en/gallery/i18n.md)
- [Sizing](https://chartjs2img.ideamans.com/en/gallery/sizing.md)

## LLM reference (single bundle)

- [chartjs2img LLM reference](https://chartjs2img.ideamans.com/llms-full.txt): full docs + Chart.js / plugin reference, concatenated for one-shot context windows.