Overview Home

bpmn-server is a BPMN-based workflow engine that integrates easily into your Node.js app. It supports built-in state persistence, variable management, and concurrency across clusters—ideal for long-running processes, durable services, and scheduled tasks.

Architecture Overview

The following diagram illustrates the core components of bpmn-server and how they interact:

• Modeler: Front-end UI for designing BPMN models using bpmn.io.
• bpmn-server Core: Executes BPMN workflows, manages state, and interfaces with external services.
• Datastore: Persists workflow state, variables, and history (MongoDB by default).
• Application Layer: Your Node.js app that integrates with the server, handles user authentication, and invokes workflows.

Quick Start

Using the Demo Project

# 1. Clone the demo app
$ git clone https://github.com/bpmnServer/bpmn-web.git
$ cd bpmn-web

# 2. Install dependencies
$ npm install

# 3. Run setup to create default install files
$ npm run setup

# 4. Edit `.env` file.

# 5. Run setup to create database and models
$ npm run setup

# 6. Start the server
$ npm run start

Open your browser to http://localhost:3000 to launch the demo.

Programmatic Usage Example

const { BPMNServer, DefaultAppDelegate } = require('bpmn-server');
const { configuration } = require('./configuration');

const server = new BPMNServer(configuration, new DefaultAppDelegate());

const processName = 'invoice';
const inputData = { amount: 1200 };

(async () => {
    const result = await server.engine.start(processName, inputData);
    console.log('Process started with instance id:', result.instance.id);
})();

For more advanced examples, see the API documentation.

Modeling

bpmn-server provides a modeling tool based on bpmn.io with a customized property panel, eliminating the need to manually edit BPMN files.

You can also import BPMN models from other tools.

Each model is defined in a BPMN XML file and consists of various elements. An element can be a node (such as events, tasks, or gateways) or a flow.

Models are managed by bpmn-server and can be queried using the Model API.

All BPMN 2.0 elements are supported. See Modeling Support

Execution

bpmn-server is primarily an execution engine for BPMN models.

Each time a model is started, an instance is created. For every element that is executed, an item is generated.

Execution follows the BPMN model logic and supports extensions such as scripting and application context access.

During execution, both Model Listeners and Application Listeners are invoked.

Access the execution engine via the Engine API.

• Invoking the Execution Engine
• Execution Behavior

Datastore

Execution data, including instances and their elements, are persisted to a datastore (MongoDB by default).

You can query this data through the Data API.

• Data Management Documentation

User Management and Security

bpmn-server delegates authentication to the front-end application, which must pass user information via the API.

1. Model designers can define assignee, candidateUsers, and candidateUserGroups using static strings or JavaScript expressions.
2. The front-end must provide a userService implementation.
3. bpmn-server enforces security rules based on the current user.

The bpmn-web demo application demonstrates full user management using Passport and MongoDB.

• Security Documentation

Demo Web Application

Live Demo

A live demo is available at: https://bpmn.omniworkflow.com

Installation

This package requires Node.js and MongoDB.

If MongoDB is not installed, you can create a free cloud account or install it locally.

1. Clone the repository

git clone https://github.com/bpmnServer/bpmn-web.git

2. Install dependencies

npm install

3. Set up the app

npm run setup

Edit the .env file to configure MongoDB:

MONGO_DB_URL=mongodb://0.0.0.0:27017/bpmn

Run setup again to create DB objects:

npm run setup

4. Start the server

npm run start

Console output:

bpmn-server WebApp.ts version 1.4.0
MongoDB URL mongodb://0.0.0.0:27017/bpmn
db connection open
App is running at http://localhost:3000 in development mode
Press CTRL-C to stop

Docker Installation

version: "3.7"
name: bpmn-server
services:
  bpmn-web:
    image: ralphhanna/bpmn-web
    command: sh -c "
        npm run setup &&
        npm run start"
    ports:
      - 3000:3000
    volumes:
      - 'app:/app'
    depends_on:
      - mongo

  mongo:
    image: mongo
    ports:
      - 27017:27017
    volumes:
      - mongodb:/data/db

volumes:
  mongodb:
    driver: local
    driver_opts:
      type: 'none'
      o: 'bind'
      device: './mongodb_volume'

  app:
    driver: local
    driver_opts:
      type: 'none'
      o: 'bind'
      device: './bpmn_server_volume'

docker compose up -d

Command Line Interface

npm run cli

server started..
Commands:
  q     quit
  s     start process
  lo    list outstanding items
  li    list items
  l     list instances for a process
  di    display instance information
  i     invoke task
  sgl   signal task
  msg   message task
  d     delete instances
  lm    list models
  lme   list model elements
  ck    check locked instances
  re    recover hung processes
  lu    list users
  spw   set user password
  ?     show this help menu

Updating to Latest Release

npm update bpmn-server

Application Integration

bpmn-server is designed to be embedded into your application. See customization guide

Documentation

• Invoking Workflows
• Execution
• Scripting
• Security
• Data
  • Input/Output
  • Data Query
• Examples
• API Summary
• API Reference
• Setup
• Application Integration

License

Licensed under the MIT License.

Acknowledgments

bpmn-server builds upon bpmn-io/bpmn-moddle by bpmn.io, and is inspired by bpmn-engine.