Awesome Open Source
Awesome Open Source


Hello, this is JDL-Studio, an online tool for drawing UML diagrams for JHipster based on the JDL syntax. It tries to keep its syntax visually as close as possible to the generated UML diagram without resorting to ASCII drawings.

Created by Deepu KS. Heavily inspired and adapted from nomnoml

JDL-Studio was made possible by these cool projects

Docker image

The official Docker image is available at

You can use JDL-Studio offline with :

docker run --rm -it -p 18080:80 jhipster/jdl-studio

The JDL-Studio should be available at: http://localhost:18080 or http://docker-ip:18080

Web application

The JDL-Studio web application is a simple editor with a live preview. It is purely client side and changes are saved to the browser's localStorage, so your diagram should be here the next time, (but no guarantees).


The canvas can be panned and zoomed by dragging and scrolling in the right hand third of the canvas. Downloaded image files will be given the filename in the #title directive.


The JDL syntax is explained here


#arrowSize: 1
#bendSize: 0.3
#direction: down | right
#gutter: 5
#edgeMargin: 0
#edges: hard | rounded
#background: transparent
#fill: #eee8d5; #fdf6e3
#fillArrows: false
#font: Calibri
#fontSize: 12
#leading: 1.25
#lineWidth: 3
#padding: 8
#spacing: 40
#stroke: #33322E
#title: filename
#zoom: 1
#acyclicer: greedy
#ranker: network-simplex | tight-tree | longest-path


If you want to contribute to the project more info is available in


This project was bootstrapped with Create React App. There are two important GIT branches. src branch holds the source code and all development needs to be done against that branch. gh-pages branch holds the deployable static site that is built from src.

Deploy to production

In order to deploy to production run npm run deploy, this will build the src branch and move the assets to the gh-pages branch and push it to GitHub, it will update the version and will create a PR to update the

Available Scripts

In the project directory, you can run:

npm start

Runs the app in the development mode.
Open http://localhost:3000 to view it in the browser.

The page will reload if you make edits.
You will also see any lint errors in the console. Make sure npm install is run before running npm start

npm test

Launches the test runner in the interactive watch mode.
See the section about running tests for more information.

npm run build

Builds the app for production to the build folder.
It correctly bundles React in production mode and optimizes the build for the best performance.

The build is minified and the filenames include the hashes.
Your app is ready to be deployed!

See the section about deployment for more information.

npm run eject

Note: this is a one-way operation. Once you eject, you can’t go back!

If you aren’t satisfied with the build tool and configuration choices, you can eject at any time. This command will remove the single build dependency from your project.

Instead, it will copy all the configuration files and the transitive dependencies (webpack, Babel, ESLint, etc) right into your project so you have full control over them. All of the commands except eject will still work, but they will point to the copied scripts so you can tweak them. At this point you’re on your own.

You don’t have to ever use eject. The curated feature set is suitable for small and middle deployments, and you shouldn’t feel obligated to use this feature. However we understand that this tool wouldn’t be useful if you couldn’t customize it when you are ready for it.

Learn More

You can learn more in the Create React App documentation.

To learn React, check out the React documentation.

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