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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MFJ file format:

The file format determines how the data is stored in the file. Each file format has a unique extension and almost always a unique signature. For example, Microsoft Word documents have the extension .docx and the signature (usually the first 3 characters in this file) PK. However, different programs can use the same file extension, and file extensions can be assigned incorrectly. Knowledge is power - this also applies when dealing with unknown or faulty files. Our evaluation of the MFJ files looks like this:

As a file extension, MFJ isn't very common and is mainly used by one program with a specific format. However, the following two file formats are common:

• 95% of all MFJ files store the data in 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. The contents of these files are partially readable with a text editor. The files are 11 KB to 450 KB in size, with a median of 140 KB. This file type is based on cutting-edge technology. The keywords "_parent": {, name, "ownedElements": [, "_type": "UMLModel", qBWK6M3Z8Y and "$ref": "AAAAAAFF+h6SjaM2Hec=" are typical for these files. The file name Fragment.mfj is characteristic of these files. Files like these have the following tags: diagrams, case, opiskelija, diagram, class, model and frag.

All other MFJ files (5%) have no consistent format. You can get all the details of your MFJ file by dragging it onto this page or by clicking the button "Choose your .mfj file to analyze" above.