All about MFJ Files

The MFJ file type is primarily associated with StarUML.

MFJ	File extension: MFJ
	File type:	JSON-based UML diagram file

What is an MFJ file?

MFJ files mostly belong to StarUML. MFJ files are used to store fragments of UML diagrams in a text-based JSON format.
They are primarily associated with StarUML and serve as model fragment files for designing and exchanging software models.
The file holds structured data for UML elements and relationships.
Key details summarized by FilExt.com include:

They use JSON internally, so the content is human-readable.

They are specially formatted for creating and editing UML diagrams in design tools.

They work with software like StarUML (StarUML website) and can also be used with Modelio for MagicDraw UML files (Modelio webpage).

FilExt.com tip: These files support modular modeling by breaking down large systems into manageable pieces.

How to open an MFJ file

You need a suitable software like StarUML to open an MFJ 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 MFJ file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a MFJ file directly in the browser:. Just drag the file onto this browser window and drop it.

Online MFJ Text Viewer

Choose your .mfj file to analyze

or drag and drop it here

Online File Viewer

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Programs that open and convert MFJ files:

StarUML
See the previous paragraphs to learn more about the main application. MFJ files are often referred to as StarUML developers because this type of file is primarily created or used by this software.
MetaFont Job Batch Input

Technical Data for MFJ File Extension

File classification:

Developer

Related files:

mdj, uml, xmi, mcd, dia, mjf

an mfj JSON-based UML diagram file is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with MFJ files

Associate the MFJ file extension with the correct application.
Update your software that should actually open json-based uml diagram files. Because only the current version supports the latest MFJ file format. Search, therefore, e.g. on the manufacturer website after an available StarUML update.
To make sure that your MFJ file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .MFJ file online - secure, fast, and no downloads needed.