mjEdit on mjEdit – OSCAL GUI Tool & JSON Editor

mjEdit DEV-Vanilla 0.1.0 — Open Source Release

Sun, 21 Jun 2026 00:00:00 +0000

On 2026-06-21, mjEdit DEV-Vanilla 0.1.0 was published as an open-source developer version on Codeberg. Full documentation and source code are freely available to all developers (AGPL-3.0).

Set up Development Environment

git clone https://codeberg.org/42tec/mjEdit.git
cd mjEdit
make dev-setup
make run

Included Plugins

browser_plugin, database_plugin, example_plugin, gui_auto_test_plugin, mje_mcp_server_plugin, network_discovery_plugin, oscal_plugin, restapi_demo_plugin, screenshot_plugin, transform_script_plugin

What’s new?

Release Notes — mjEdit 0.1.1

► Release mjEdit 0.1.1 · Build SLA-20260609.001-0.1.1 · 06/10/2026

mjEdit Community 0.1.0 released

Wed, 10 Jun 2026 00:00:00 +0000

Today, on 2026-06-10, mjEdit-Editor Community 0.1.0 was released. The packages can be downloaded directly:

Downloads

Windows: Setup-mjEdit-Win64-community-0.1.0-001-SLA.msi (~1218.3 MB)

What’s new?

Release Notes — Community Edition

Target group: Open standard edition under AGPL-3.0 for all users.

Release Notes — mjEdit 0.1.1

► Release mjEdit 0.1.1 · Build SLA-20260609.001-0.1.1 · 06/10/2026

Release Notes — mjEdit Community Edition

Wed, 10 Jun 2026 00:00:00 +0000

Release Notes — Community Edition

Target group: Open standard edition under AGPL-3.0 for all users.

► Release mjEdit 0.1.0 · Build SLA-20260610.001-0.1.0 · 06/10/2026

Date	User Story	Description
10.06.2026	us-20260610-1000	Website: Dedicated release notes pages per edition
09.06.2026	us-20260609-2100	Makefile: MSI installer gets correct version number from build_info.json
09.06.2026	us-20260609-1200	OSCAL catalog: "Description (Prose)" panel shows items with numbering
09.06.2026	us-20260609-1800	OSCAL catalog: Dynamic parts sub-tab in the "Edit Control" dialog
09.06.2026	us-20260609-1200	OSCAL catalog: Prose/Description renders correctly (no more raw HTML)
10.06.2026	us-20260610-0900	projectconf.json: Runtime language, reliable dialog & Leak protection
09.06.2026	us-20260609-1515	Help system: English OSCAL workflow tutorial extends
09.06.2026	us-20260609-1056	Bugfix: projectconf.json colors are immediately visible in the file tree
09.06.2026	us-20260609-1056	Project configuration per directory (projectconf.json)
09.06.2026	us-20260609-1056	Project configuration per directory (projectconf.json)
09.06.2026	us-20260609-1056	Project configuration per directory (projectconf.json)
09.06.2026	us-20260609-1056	Project configuration per directory (projectconf.json)
09.06.2026	us-20260609-1056	Project configuration per directory (projectconf.json)
09.06.2026	us-20260609-1056	Project configuration per directory (projectconf.json)
19.05.2026		First-run integration of the OSCAL directories dialog (us-20260519-1200-SL-FIRST-RUN-OSCAL-DIRS)
18.05.2026		OSCAL directories dialog extended (us-20260518-1800-SL-OSCAL-BASE-DIRS-DIALOG)
18.05.2026		Signed, versioned MCP audit trail (us-20260518-1100-SL-MCP-AUDIT-SIGNED)
17.05.2026		Unified OSCAL Standard Directories + MCP Auto Repository (us-20260517-1200-SL-OSCAL-STANDARD-DIRECTORY-KEYS)
15.05.2026		Fix: Fixed duplicate download maps on website (us-20260515-1900-SLA-FIX-DOUBLE-DOWNLOADS)
15.05.2026		Fix: Hugo sync conflict for EN download.md (release pipeline)
14.05.2026	us-20260514-1300	Help index link navigation (bug fix)
14.05.2026		Help index link navigation (bug fix)
14.05.2026		Help index link navigation (bug fix)
14.05.2026		Help index link navigation (bug fix)
14.05.2026		Help index link navigation (bug fix)

Release Notes — mjEdit LTS Edition

Wed, 10 Jun 2026 00:00:00 +0000

Release Notes — LTS Edition

Target group: Production stable version with extended support period.

► Release mjEdit 0.1.0 · Build SLA-20260609.001-0.1.1 · 06/10/2026

Date	User Story	Description
10.06.2026	us-20260610-1000	Website: Dedicated release notes pages per edition
09.06.2026	us-20260609-2100	Makefile: MSI installer gets correct version number from build_info.json
09.06.2026	us-20260609-1200	OSCAL catalog: "Description (Prose)" panel shows items with numbering
09.06.2026	us-20260609-1800	OSCAL catalog: Dynamic parts sub-tab in the "Edit Control" dialog
09.06.2026	us-20260609-1200	OSCAL catalog: Prose/Description renders correctly (no more raw HTML)
10.06.2026	us-20260610-0900	projectconf.json: Runtime language, reliable dialog & Leak protection
09.06.2026	us-20260609-1515	Help system: English OSCAL workflow tutorial extends
09.06.2026	us-20260609-1056	Bugfix: projectconf.json colors are immediately visible in the file tree
09.06.2026	us-20260609-1056	Project configuration per directory (projectconf.json)
09.06.2026	us-20260609-1056	Project configuration per directory (projectconf.json)
09.06.2026	us-20260609-1056	Project configuration per directory (projectconf.json)
09.06.2026	us-20260609-1056	Project configuration per directory (projectconf.json)
09.06.2026	us-20260609-1056	Project configuration per directory (projectconf.json)
09.06.2026	us-20260609-1056	Project configuration per directory (projectconf.json)
19.05.2026		First-run integration of the OSCAL directories dialog (us-20260519-1200-SL-FIRST-RUN-OSCAL-DIRS)
18.05.2026		OSCAL directories dialog extended (us-20260518-1800-SL-OSCAL-BASE-DIRS-DIALOG)
18.05.2026		Signed, versioned MCP audit trail (us-20260518-1100-SL-MCP-AUDIT-SIGNED)
17.05.2026		Unified OSCAL Standard Directories + MCP Auto Repository (us-20260517-1200-SL-OSCAL-STANDARD-DIRECTORY-KEYS)
15.05.2026		Fix: Fixed duplicate download maps on website (us-20260515-1900-SLA-FIX-DOUBLE-DOWNLOADS)
15.05.2026		Fix: Hugo sync conflict for EN download.md (release pipeline)
14.05.2026	us-20260514-1300	Help index link navigation (bug fix)
14.05.2026		Help index link navigation (bug fix)
14.05.2026		Help index link navigation (bug fix)
14.05.2026		Help index link navigation (bug fix)
14.05.2026		Help index link navigation (bug fix)

Release Notes — mjEdit VIP Tester Edition

Wed, 10 Jun 2026 00:00:00 +0000

Release Notes — VIP Tester Edition

Target group: Alpha edition for selected testers — contains experimental functions.

► Release mjEdit 0.1.0 · Build SLA-20260609.001-0.1.1 · 06/10/2026

Date	User Story	Description
10.06.2026	us-20260610-1000	Website: Dedicated release notes pages per edition
09.06.2026	us-20260609-2100	Makefile: MSI installer gets correct version number from build_info.json
09.06.2026	us-20260609-1200	OSCAL catalog: "Description (Prose)" panel shows items with numbering
09.06.2026	us-20260609-1800	OSCAL catalog: Dynamic parts sub-tab in the "Edit Control" dialog
09.06.2026	us-20260609-1200	OSCAL catalog: Prose/Description renders correctly (no more raw HTML)
10.06.2026	us-20260610-0900	projectconf.json: Runtime language, reliable dialog & Leak protection
09.06.2026	us-20260609-1515	Help system: English OSCAL workflow tutorial extends
09.06.2026	us-20260609-1056	Bugfix: projectconf.json colors are immediately visible in the file tree
09.06.2026	us-20260609-1056	Project configuration per directory (projectconf.json)
09.06.2026	us-20260609-1056	Project configuration per directory (projectconf.json)
09.06.2026	us-20260609-1056	Project configuration per directory (projectconf.json)
09.06.2026	us-20260609-1056	Project configuration per directory (projectconf.json)
09.06.2026	us-20260609-1056	Project configuration per directory (projectconf.json)
09.06.2026	us-20260609-1056	Project configuration per directory (projectconf.json)
19.05.2026		First-run integration of the OSCAL directories dialog (us-20260519-1200-SL-FIRST-RUN-OSCAL-DIRS)
18.05.2026		OSCAL directories dialog extended (us-20260518-1800-SL-OSCAL-BASE-DIRS-DIALOG)
18.05.2026		Signed, versioned MCP audit trail (us-20260518-1100-SL-MCP-AUDIT-SIGNED)
17.05.2026		Unified OSCAL Standard Directories + MCP Auto Repository (us-20260517-1200-SL-OSCAL-STANDARD-DIRECTORY-KEYS)
15.05.2026		Fix: Fixed duplicate download maps on website (us-20260515-1900-SLA-FIX-DOUBLE-DOWNLOADS)
15.05.2026		Fix: Hugo sync conflict for EN download.md (release pipeline)
14.05.2026	us-20260514-1300	Help index link navigation (bug fix)
14.05.2026		Help index link navigation (bug fix)
14.05.2026		Help index link navigation (bug fix)
14.05.2026		Help index link navigation (bug fix)
14.05.2026		Help index link navigation (bug fix)

mjEdit Community SLA-20260529.001-0.1.0 released

Fri, 29 May 2026 00:00:00 +0000

Today, on 2026-05-29, mjEdit-Editor Community SLA-20260529.001-0.1.0 was released. The packages can be downloaded directly:

Downloads

Windows: Setup-mjEdit-Win64-community-0.1.1-002-SLA.msi (~1218.2 MB)

What’s new?

Release Notes — mjEdit 0.1.0

Version: 0.1.0
Date: 2026-05-29
Build: SLA-20260529.001-0.1.0

05/26/2026 — REST API Demo Plugin

User Story: us-20260526-DEV-VANILLA-OSS

New features:

REST API Demo Plugin (plugins/restapi_demo_plugin/):
- demo_server.py: FastAPI server on port 8765 (localhost only), endpoints: GET /health, GET /project/report, GET /controls/report — Path traversal protection via os.path.realpath() + whitelist
- api_client.py: HTTP client only with urllib (no external dependencies), Regex check: only http://localhost: and http://127.0.0.1: allowed
- restapi_gui.py: PySide6 tab with QThread worker for non-blocking requests, QTableWidget for results, shiboken6.isValid() checks
- plugin.py: Full plugin lifecycle with server management
Example Plugin updated:

BSI-Grundschutz++ from January 1, 2027: New rules, new luck, same Excel tables?

Thu, 28 May 2026 00:00:00 +0000

To the point

Grundschutz++ expects all documents in native OSCAL format. But do you know whether your ISMS/GRC tool natively supports the OSCAL format? If not: There is an alternative - look at mjEdit.

For those interested

The good news: If usual practice is maintained, you probably have until 2028 to migrate your ISMS to Grundschutz++.

The challenge: Time passes quickly, especially when new tooling is needed, because the manufacturer of your previous GRC tool cannot clearly say when all OSCAL document types will actually be fully supported and the entire process can be mapped consistently.

mjEdit is approaching beta: Looking for GRC testers for multi-compliance and security

Fri, 15 May 2026 00:00:00 +0000

mjEdit is currently in the final phase of alpha testing. The core functionality - OSCAL document editing, AI integration via MCP and the modular plugin system - is so far stable and has been offered to external testers for testing mjEdit in a closed group of VIP testers for a few days.

Next step: Extended beta test with GRC focus

In advance of the official release, we would like to specifically validate mjEdit in real GRC environments. We are looking for experts and teams who can test mjEdit under production-related conditions in the following fields of application:

AI & MCP

Mon, 01 Jan 0001 00:00:00 +0000

Note: The MCP integration is in early development. The tools are already fully functional and can be tried out in test environments with supported AI agents (Claude Desktop, Cursor, VS Code Copilot, AnythingLLM).

What is MCP?

The Model Context Protocol (MCP) is an open standard that enables AI systems to communicate with external tools. mjEdit implements a complete MCP server with two transport options:

STDIO – Direct process communication (Claude Desktop, Cursor, VS Code Copilot)
SSE – HTTP Server-Sent Events on localhost (AnythingLLM Docker, own integrations)

154 MCP tools – what does this mean in practice?

Instead of just talking to an editor, an AI can work with mjEdit: create files, convert content, generate OSCAL documents, passively discover network assets, scan for CVE vulnerabilities, control entire compliance dashboards. The following examples show how this feels in everyday life.

Download

Mon, 01 Jan 0001 00:00:00 +0000

Which target is the right one?

Community (recommended): The open standard version under AGPL-3.0 for all users.
VipTester: Alpha version for selected testers. Who alpha tester If you would like to be registered, you can contact us by email with a brief explanation.
LTS (in preparation): Commercial long-term support version with Long-term care. Currently not available on the website, please contact us for more information.

⬇️

mjEdit Editor - Community 0.1.0 (Windows)

Windows · Win64 · ~1218.3 MB · Status: 2026-06-10

Features

Mon, 01 Jan 0001 00:00:00 +0000

mjEdit combines the most important tools for daily work in a single interface.

What makes mjEdit different from other JSON editors

Property	Standard JSON Editors	mjEdit
OSCAL detection	Manual	Automatic – detects document type and opens specialized tab
Schema validation	Generic	OSCAL v1.2.2 schemas pre-installed, real-time validation
AI integration	None	154 MCP tools for fully automated OSCAL workflows
Compliance data	Not available	BSI Basic Protection (2,128 Controls), NIST 800-53 (468 Controls)
Document chains	Not possible	One click: Profile → SSP → AP → AR → POA&M
Inventory Management	Not available	Components (Classes) ↔ Inventory (Instances)

The core functions

JSON editor

Syntax highlighting, real-time validation, auto-repair, regex search, code folding and intelligent performance management for files from 1 MB+.

For developers – plugin system

Mon, 01 Jan 0001 00:00:00 +0000

mjEdit is not just an OSCAL editor, but a platform. The entire program is based on a documented plugin system: Even central functions such as the OSCAL editor, network discovery or the MCP server are available as plugins and use exactly the API that is also available to you.

If an internal mjEdit feature could be implemented with it, your plugin can too.

The special

Open by design: mjEdit is designed as an extensible application. Functions such as OSCAL tabs, browser tab, database tab, network discovery, MCP server and JSON transform tools are their own plugins - no closed-source inner workings.
Stable hook contracts: The interfaces are versioned in plugins/hook_contracts.py as Enum + Dataclass events. Calls like file_opened are delivered via a typed FileOpenedEvent - old signatures remain backwards compatible.
Lifecycle separation: Early on_load() for registrations, separate on_gui_ready() once the GUI is complete. This prevents the typical “MainGUI not there yet” crashes of other plugin systems.
Robustly isolated: Errors in a plugin hook do not block the core or other plugins. When unloading, menu items, toolbar buttons, editor functions and hooks are automatically cleaned up by BasePlugin.on_unload().
Configuration instead of click installation: Activation via config/config.json → sys_active_plugins. Version-proof, deployable, Git-friendly.

How it works

plugins/
├── __init__.py          # PluginManager: Laden, Aktivieren, Hook-Aufrufe, Entladen
├── base.py              # BasePlugin: Lifecycle + Menü-/Toolbar-Helfer + Cleanup
├── hook_contracts.py    # HookName-Enum + typisierte Events
└── my_plugin/
    ├── __init__.py      # exportiert Plugin
    └── plugin.py        # Ihre Plugin-Klasse

Each plugin exports a class Plugin, which inherits from BasePlugin. The PluginManager only loads plugins listed in sys_active_plugins, calls the lifecycle in the correct order, and distributes hook calls to all registered callbacks.

imprint

Mon, 01 Jan 0001 00:00:00 +0000

Information in accordance with Section 5 TMG

Stephan Lange
mjEdit – open source project
(address on request)

Contact

Email: info@mjedit.de

Responsible for the content according to Section 18 Paragraph 2 MStV

Stephan Lange (RagnarBlodhammer)
(address as above)

Liability for content

The contents of this page were created with the greatest care. However, no guarantee can be given that the content is correct, complete or up-to-date. As a service provider, we are responsible for our own content on these pages in accordance with general laws in accordance with Section 7 Paragraph 1 TMG. However, according to Sections 8 to 10 TMG, as a service provider we are not obliged to monitor transmitted or stored third-party information or to investigate circumstances that indicate illegal activity.

Installation instructions

Mon, 01 Jan 0001 00:00:00 +0000

Important information before downloading

Size of installation files: The packages are intentionally large, because they include sample data, local AI models as well as the complete ones Bring runtime environments for Python and Java. This is how mjEdit works offline without any further installations.
First start - User information: When starting for the first time, mjEdit asks some user information.
Initialization takes a short time: mjEdit crashes the first time it is started Dokumente/mjEdit sample files and the directory structure. After creation, the start screen appears.

OSCAL integration

Mon, 01 Jan 0001 00:00:00 +0000

mjEdit supports the full OSCAL v1.2.2 standard with specialized editors for each document type.

All 8 OSCAL document types

Document type	Abbreviation	Function	mjEdit feature
Catalog	catalog	Define control framework	Browse, edit, create groups/controls
Profile	profiles	Make Baseline Selection	Select controls, tailoring, set parameters
System Security Plan	ssp	Document system	Components, Inventory, Control Implementation
Assessment Plan	ap	Schedule exam	Define test methods, scope, time frame
Assessment Results	ar	Document results	Findings, observations, collecting evidence
Plan of Action & Milestones	poam	Track measures	Remediation items, deadlines, status tracking
Component Definition	component	Define building blocks	Reusable Component Libraries
Mapping Collection	mapping	Mapping frameworks	Bidirectional control mapping between standards

The OOP principle: components as classes, inventory as instances

mjEdit intuitively maps the OSCAL architecture – based on object-oriented programming:

Support

Mon, 01 Jan 0001 00:00:00 +0000

Feedback & error messages

Have you discovered a bug or an idea to improve mjEdit? We look forward to any feedback - whether it’s a bug report, improvement suggestion or feature request. To do this, use the public issue tracker on Codeberg:

→ Open issue tracker

This is how the process works

1. Create an account (one-time)

To create an issue you need a free account with Codeberg. Codeberg is a European, privacy-friendly open source platform – comparable to GitHub. Registration takes a few minutes and only requires an email address.

Tabs in detail

Mon, 01 Jan 0001 00:00:00 +0000

mjEdit organizes work in a multi-tab system. Each tab is specialized for a specific workspace and works seamlessly with the others.

Text Tab — The JSON editor

The heart of mjEdit: a full-fledged JSON editor with syntax highlighting, real-time validation, bracket matching and intelligent auto-repair.

Performance modes for large files

File size	behavior
< 100KB	Full highlighting + spell check + all features
100KB – 200KB	Simplified highlighting (keys/brackets only), no spell check
> 1MB	No highlighting, lazy loading (first 10,000 lines)

Form Tab — qFORM form system & QC scripts

The Form tab automatically turns JSON data into editable forms. The proprietary qFORM format combines structured data entry with embedded Python scripts (QC scripts) in a RestrictedPython sandbox.

Target groups and use cases

Mon, 01 Jan 0001 00:00:00 +0000

mjEdit is not a tool for a single role, but a common OSCAL work environment for all people who work with compliance content - from strategic control to technical implementation. On this page we show per role: typical daily tasks, the concrete pain without mjEdit, the answer from mjEdit and a practical example.

Three AI pillars used consistently:

🧠 AI Agent (Claude Desktop, Cursor, VS Code Copilot or AnythingLLM) as a voice front end - the person dictates, the AI acts.

🔌 MCP protocol (154 tools, 22 resources, 15 prompts): the bridge with which the AI serves mjEdit - create files, change JSON, validate, control GUI.

📚 AnythingLLM-RAG: local knowledge base for ISMS documents, BSI compendium, operating manuals - the AI answers from your documents instead of half-knowledge.

For each role, which of these three columns provides the greatest leverage is marked below.

Thank you!

Mon, 01 Jan 0001 00:00:00 +0000

Thank you for your message!

Your request has been successfully submitted. We will usually get back to you within a few working days.

In the meantime you can:

the Download marketing brochure,
learn more about the OSCAL integration,
view the 154 MCP tools,
or return to Homepage.