d2

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Table of Contents

• What does D2 look like?
• Quickstart
• Install
• D2 as a library
• Themes
• Fonts
• Export file types
• Language tooling
• Layout engines
• Comparison
• Contributing
• License
• Related
  • Official plugins
  • Community plugins
  • Misc
• FAQ
• Notable open-source projects documenting with D2

What does D2 look like?

vars: {
  d2-config: {
    layout-engine: elk
    # Terminal theme code
    theme-id: 300
  }
}
network: {
  cell tower: {
    satellites: {
      shape: stored_data
      style.multiple: true
    }

    transmitter

    satellites -> transmitter: send
    satellites -> transmitter: send
    satellites -> transmitter: send
  }

  online portal: {
    ui: {shape: hexagon}
  }

  data processor: {
    storage: {
      shape: cylinder
      style.multiple: true
    }
  }

  cell tower.transmitter -> data processor.storage: phone logs
}

user: {
  shape: person
  width: 130
}

user -> network.cell tower: make call
user -> network.online portal.ui: access {
  style.stroke-dash: 3
}

api server -> network.online portal.ui: display
api server -> logs: persist
logs: {shape: page; style.multiple: true}

network.data processor -> api server

Open in playground

For more examples, see ./docs/examples.

Quickstart

The most convenient way to use D2 is to just run it as a CLI executable to produce SVGs from .d2 files.

# First, install D2
curl -fsSL https://d2lang.com/install.sh | sh -s --

echo 'x -> y -> z' > in.d2
d2 --watch in.d2 out.svg

A browser window will open with out.svg and live-reload on changes to in.d2.

Install

The easiest way to install is with our install script:

curl -fsSL https://d2lang.com/install.sh | sh -s --

You can run the install script with --dry-run to see the commands that will be used to install without executing them.

Or if you have Go installed you can install from source though you won't get the manpage:

go install github.com/d2lang/d2@latest

You can also install a release from source which will include manpages. See ./docs/INSTALL.md#source-release.

To uninstall with the install script:

curl -fsSL https://d2lang.com/install.sh | sh -s -- --uninstall

For detailed installation docs, see ./docs/INSTALL.md. We demonstrate alternative methods and examples for each OS.

As well, the functioning of the install script is described in detail to alleviate any concern of its use. We recommend using your OS's package manager directly instead for improved security but the install script is by no means insecure.

D2 as a library

In addition to being a runnable CLI tool, D2 can also be used to produce diagrams from Go programs.

For examples, see ./docs/examples/lib.

Themes

D2 includes a variety of official themes to style your diagrams beautifully right out of the box. See ./d2themes to browse the available themes and make or contribute your own creation.

Fonts

D2 ships with "Source Sans Pro" as the font in renders. If you wish to use a different one, please see ./d2renderers/d2fonts.

Export file types

D2 supports SVG, PNG, GIF, PDF, and PPTX exports.

Language tooling

D2 is designed with language tooling in mind. D2's parser can parse multiple errors from a broken program, has an autoformatter, syntax highlighting, and we have plans for LSP's and more. Good language tooling is necessary for creating and maintaining large diagrams.

The extensions for VSCode and Vim can be found in the Related section.

Layout engines

D2 bundles three layout engines. Select one with --layout=dagre, --layout=elk, or --layout=tala. You can also set D2_LAYOUT or vars.d2-config.layout-engine in D2 source. Run d2 layout to list the engines or d2 layout <name> for their configuration options.

• Dagro (default, bundled): A native Go port of the Dagre directed graph layout engine that produces layered/hierarchical layouts. Based on Graphviz's DOT algorithm.
• elk-go (bundled): A native Go port of the ELK directed graph layout engine, particularly suited for node-link diagrams with an inherent direction and ports.
• TALA (bundled, opt-in): Native layout and edge-routing engine designed specifically for software architecture diagrams. Select it with --layout=tala, D2_LAYOUT=tala, or a layout-engine: tala setting under vars.d2-config in D2 source.

D2 also handles specialized layouts such as sequence diagrams and grids. Go applications can use the layout packages directly or provide layout and routing functions through d2lib.

Sketch-mode rendering uses rough-go, a native Go compatibility port of the Rough.js 4.6.6 rendering surface used by D2.

LaTeX labels use mathjax-go, a native Go port of the MathJax 3.2.2 TeX-to-SVG pipeline.

Comparison

For a comparison against other popular text-to-diagram tools, see https://text-to-diagram.com.

Contributing

Contributions are welcome! See ./docs/CONTRIBUTING.md.

License

Open sourced under the Mozilla Public License 2.0. See ./LICENSE.txt.

Related

We are constantly working on new plugins, integrations, extensions. Contributions are welcome in any official or community plugins. If you have somewhere in your workflow that you want to use D2, feel free to open a discussion. We have limited bandwidth and usually choose the most high-demand ones to work on. If you make something cool with D2 yourself, let us know and we'll be happy to include it here!

Official plugins

• VSCode extension: https://github.com/d2lang/d2-vscode
• Vim extension: https://github.com/d2lang/d2-vim
• Obsidian plugin: https://github.com/d2lang/d2-obsidian

Community plugins

• Tree-sitter grammar: https://github.com/ravsii/tree-sitter-d2
• Emacs major mode: https://github.com/andorsk/d2-mode
• Goldmark extension: https://github.com/FurqanSoftware/goldmark-d2
• Telegram bot: https://github.com/meinside/telegram-d2-bot
• Postgres importer: https://github.com/zekenie/d2-erd-from-postgres
• Structurizr to D2 exporter: https://github.com/goto1134/structurizr-d2-exporter
• MdBook preprocessor: https://github.com/danieleades/mdbook-d2
• ROS2 D2 Exporter: https://github.com/Greenroom-Robotics/ros-d2
• D2 org-mode support: https://github.com/xcapaldi/ob-d2
• Python D2 diagram builder: https://github.com/MrBlenny/py-d2
• Clojure D2 transpiler: https://github.com/judepayne/dictim
• JavaScript D2 diagram builder: https://github.com/Kreshnik/d2lang-js
• C# & dotnet SDK: https://github.com/Stephanvs/d2lang-cs
• Maven plugin: https://github.com/andrinmeier/unofficial-d2lang-maven-plugin
• Confluence plugin: https://github.com/andrinmeier/unofficial-d2lang-confluence-plugin
• CIL (C#, Visual Basic, F#, C++ CLR) to D2: https://github.com/HugoVG/AppDiagram
• D2 Snippets (for text editors): https://github.com/Paracelsus-Rose/D2-Language-Code-Snippets
• Mongo to D2: https://github.com/novuhq/mongo-to-D2
• Pandoc filter (TypeScript): https://github.com/ram02z/d2-filter
• Pandoc filter (Python): https://github.com/fliiiix/pandoc-d2-filter
• Logseq-D2: https://github.com/b-yp/logseq-d2
• ent2d2: https://github.com/tmc/ent2d2
• MkDocs Plugin: https://github.com/landmaj/mkdocs-d2-plugin
• Remark Plugin: https://github.com/mech-a/remark-d2
• VitePress Plugin: https://github.com/BadgerHobbs/vitepress-plugin-d2
• Zed extension: https://github.com/gabeidx/zed-d2
• Hexo blog extension: https://github.com/leverimmy/hexo-d2
• Rehype Plugin: https://github.com/stereobooster/beoe/tree/main/packages/rehype-d2
• AsyncAPI to D2: https://github.com/holydocs/messageflow
• Database Schemas to D2: https://github.com/holydocs/dberd

Misc

• Comparison site: https://github.com/d2lang/text-to-diagram-site
• Playground: https://github.com/d2lang/d2-playground
• Language docs: https://github.com/d2lang/d2-docs
• Hosted icons: https://icons.d2lang.com

FAQ

• Does D2 collect telemetry?
  • No, D2 does not use an internet connection after installation, except to check for version updates from Github periodically.
• Does D2 need a browser to run?
  • No, D2 can run entirely server-side.
• What's coming in the next release?
  • See ./ci/release/changelogs/next.md.
• I have a question or need help.
  • The best way to get help is to ask on D2 Discord
• I have a feature request, proposal, or bug report.
  • Please open up a Github Issue.
• I have a private inquiry.
  • Please reach out at hi@d2lang.com.

Notable open-source projects documenting with D2

Do you have or see an open-source project with .d2 files? Please submit a PR adding to this selected list of featured projects using D2.

• ElasticSearch
• Sourcegraph
• Temporal
• Tauri
  • Rust GUI framework (78.5k stars)
• Intellij
• Coder
• UC Berkeley
• Coronacheck
  • Official app of the Netherlands for coronavirus entry passes.
• Block Protocol
  • The Block Protocol is an open standard for building and using data-driven blocks (1.2k stars).
• Dagger
  • A programmable CI/CD engine that runs your pipelines in containers (8k stars).
• Ivy Wallet
  • Open-source money manager app for Android (1.1k stars).
• LocalStack
  • Cloud service emulator (46k stars)
• Queue Library
  • Queue is a Golang library for spawning and managing a Goroutine pool