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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MDJ file format:

If you can determine the file format, the associated program can also be determined. A file format is determined by the file extension and signature, so JPEG images have the extension .jpg and the first bytes in the file are ÿØÿ. If the file extension or signature does not match the file format, errors will occur when opening or editing the file. So a detailed analysis of a file is vital in order to determine the format and the associated program. Our evaluation of the MDJ files looks like this:

The MDJ extension is quite commonly used. The file itself is mainly used by one program with a specific format. The two most popular formats are as follows:

• 98% of all MDJ files are StarUML Model files, which are based on the JSON file format. JSON (JavaScript Object Notation) is a lightweight data−interchange format. It is easy for humans to read and write. It is easy for machines to parse and generate. These files are not pure binary files and are therefore readable and interpretable with a text editor. The files are 59 KB to 650 KB in size, with a median of 200 KB. The file type is relatively new. Several words can almost always be found in the files, e.g. "ownedElements": [, "_type": "Project", "_parent": {, "_id": "AAAAAAFF+h6SjaM2Hec=", "_type": "UMLModel", "name": "Untitled", "_id": "AAAAAAFF+qBWK6M3Z8Y=" and "$ref": "AAAAAAFF+h6Sj. Files like these are sometimes connected to diagram, diagrama, case, class, diagramme, classe, sequence, activity, usecase and clases.

All other MDJ files (2%) have no consistent format. These files sometimes refer to modelo, casos, diagramas, caso, diagrams or diag. You can get all the details of your MDJ file by dragging it onto this page or by clicking the button "Choose your .mdj file to analyze" above.