Programming language: JavaScript
License: Mozilla Public License 2.0
Tags: Data Visualization    

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JointJS - JavaScript diagramming library

Build Status Code Quality: Javascript Total Alerts

JointJS is a JavaScript diagramming library. It can be used to create either static diagrams or, and more importantly, fully interactive diagramming tools and application builders.

Further information, examples and documentation can be found at https://jointjs.com.

:bulb: To ask a question, share feedback, or engage in a discussion with other community members, visit our GitHub discussions.

:pen: More examples are available on CodePen.

:book: Check out our mind-map documentation.


  • basic diagram elements (rect, circle, ellipse, text, image, path)
  • ready-to-use diagram elements of well-known diagrams (ERD, Org chart, FSA, UML, PN, DEVS, ...)
  • custom diagram elements based on SVG or programmatically rendered
  • interactive elements and links
  • connecting diagram elements with links or links with links
  • customizable links, their arrowheads and labels
  • links smoothing (bezier interpolation)
  • magnets (link connection points) can be placed basically anywhere
  • hierarchical diagrams
  • serialization/deserialization to/from JSON format
  • highly event driven - you can react on any event that happens inside the paper
  • zoom in/out
  • touch support
  • plugin awareness
  • MVC architecture
  • ... a lot more

Supported browsers

  • Latest Google Chrome (including mobile)
  • Latest Firefox
  • Latest Safari (including mobile)
  • Latest MSEdge
  • Latest Opera
  • IE 11

Any problem with JointJS in the above browsers should be reported as a bug in JointJS.

Development Environment

If you want to work on JointJS locally, use the following guidelines to get started.


Make sure you have the following dependencies installed on your system:


Clone this git repository:

git clone https://github.com/clientIO/joint.git

Change into the joint directory:

cd joint

Install all NPM dependencies:

npm install

Generate build files from the source code:

grunt install

You are ready now to browse our demos:

cd demo


To run all tests:

grunt test

To run only the server-side tests:

grunt test:server

To run only the client-side tests:

grunt test:client


To check for linting errors in src and type directories:

npm run lint

To auto fix errors, run eslint for src and type directories:

npm run lint:fix

Code Coverage Reports

To output a code coverage report in HTML:

grunt test:coverage

To output a code coverage report in lcov format:

grunt test:coverage --reporter="lcov"

The output for all unit tests will be saved in the coverage directory.

Building Distribution Files

The dist directory contains pre-built distribution files. To re-build them, run the following:

grunt dist


The source for the JointJS documentation (plus geometry and Vectorizer libraries) are included in this repository; see the docs directory. The documentation can be built into stand-alone HTML documents like this:

grunt build:docs

The output of the above command can be found at build/docs.


JointJS library is licensed under the Mozilla Public License, v. 2.0. Please see the LICENSE file for the full license.

Copyright (c) 2013 client IO


*Note that all licence references and agreements mentioned in the jointjs README section above are relevant to that project's source code only.