Opening an MDJ File

The MDJ file type is primarily associated with StarUML.

MDJ	File extension: MDJ
	File type:	Project file

What is an MDJ file

MDJ files mostly belong to StarUML. MDJ files are project files used by StarUML for creating and storing UML diagrams in a JSON format. They contain data that defines diagram elements such as classes, relationships, and other modeling components.
These files serve multiple purposes:

Diagram Storage: They keep all the elements of a UML diagram structured in plain text.

Project Management: They act as a container for the entire project, keeping track of diagram configurations.

Interoperability: Their JSON basis allows them to be read by other tools that support JSON or even by text editors for quick checks.

FilExt.com notes: You can open and edit MDJ files with StarUML, and for manual inspection, any text editor will show the JSON content. Some instances are also noted as project files or diagram files by Modelio. For more detailed information, visit the StarUML website.

How to open an MDJ file

You need a suitable software like StarUML to open an MDJ file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your MDJ file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a MDJ file directly in the browser:. Just drag the file onto this browser window and drop it.

Online MDJ Text Viewer

Choose your .mdj file to analyze

or drag and drop it here

Online File Viewer

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Programs that open and convert MDJ files:

StarUML
See the previous paragraphs to learn more about the main application. MDJ files are often referred to as StarUML developers because this type of file is primarily created or used by this software.
StarUML
An .MDJ file is a JSON-based file format primarily associated with StarUML, a popular Unified Modeling Language (UML) diagramming tool. It stores UML diagrams, including their elements, relationships, and properties, in a structured format. While the .MDJ extension is most commonly used, StarUML project files can also use this format. These files are essential for saving and sharing UML diagrams created within the StarUML environment. This file format is classified as Developer Files.

Technical Data for MDJ File Extension

File classification:

Developer

Related files:

uml, xmi, eap, mdp, diag, dmj, mdk, mfj, suml, umlcd, uxf, json

an mdj Project file is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with MDJ files

Associate the MDJ file extension with the correct application.
Update your software that should actually open project files. Because only the current version supports the latest MDJ file format. Search, therefore, e.g. on the manufacturer website after an available StarUML update.
To make sure that your MDJ file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
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