Write processes as code.
Get BPMN diagrams.

A tiny DSL that compiles plain text into standard BPMN 2.0 XML with auto-layout. Use the CLI, import as a library, or try the interactive editor.

Open Editor GitHub

// try it

Live compiler

Edit the DSL on the left. The BPMN XML updates instantly on the right.

input.bac

output.bpmn

// features

Everything you need

Feature-complete BPMN 2.0 support in a single dependency.

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Full BPMN 2.0

All element types: 7 task types, 10 event subtypes, 4 gateways, boundary events, pools, lanes, annotations, data objects.

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CLI + Library

Use npx bpmn-compile from the command line or import compile() in your code.

✎

Web Editor

Interactive split-pane editor with live BPMN preview. Bi-directional: edit code or drag elements.

❖

Syntax Highlighting

Built-in highlighting for all keywords, event types, arrows, strings, and comments.

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Dark & Light

Both editor and landing page support dark/light themes with OS preference detection.

✓

62 Tests

Comprehensive test suite covering lexer, parser, generator, and full compilation integration.

// syntax

DSL reference

Clean, readable syntax for every BPMN 2.0 construct.

Events & Tasks

# Events with subtypes
start: id "Label" message
end:   id "Label" terminate
catch: id "Label" timer
throw: id "Label" signal

# Boundary events
boundary: id "Label" error on task_id
boundary: id "Label" timer on task_id noninterrupting

# Task types
task: id "Label" user by "Role"
task: id "Label" service loop parallel

Flows & Structure

# Sequence flows
a -> b -> c
a --[condition]--> b
a ==> b              # default flow
a ~> b               # message flow

# Gateways
gateway: id "Label" exclusive
gateway: id "Label" parallel
gateway: id "Label" eventbased

# Pools, lanes, annotations
pool: id "Pool"
lane: id "Lane" in pool_id
note: id "Text" on task_id

Write processes as code.Get BPMN diagrams.