Moldo
Visual educational programming - block-based, Python-powered, extensible.
Moldo is the backend runtime for a visual block-based programming environment. Learners drag and connect blocks in the mflow-editor desktop app to build programs. The editor compiles the visual graph to a JSON program tree and sends it to this backend, which executes it and streams the output back.
The system is extensible through molds - self-contained .zip.mold packages that add new block types to the editor. The 7 built-in capabilities (variables, I/O, control, math, text, collections, functions) are themselves molds.
Installation
pip install moldo
moldo serve
Or from source:
git clone https://github.com/GracePeterMutiibwa/moldo
cd moldo
python3 -m venv .venv && source .venv/bin/activate
pip install -e .
moldo serve
The backend runs at http://127.0.0.1:8000. Open mflow-editor and the green dot in the toolbar confirms the connection.
API
| Endpoint | Description |
|---|---|
GET /health |
Health check |
POST /run |
Execute a JSON program tree |
GET /molds |
List installed molds |
POST /molds/install |
Upload and install a .zip.mold |
DELETE /molds/{name} |
Uninstall a community mold |
Full API docs → docs/api.md or run mkdocs serve for the rendered site.
Molds
A mold adds new block types to the editor. Install any .zip.mold from the editor toolbar - no restart required.
To build your own mold:
- Download the mold-template from this repository
- Follow the mold developer guide
- Pack and attach to a GitHub Release
Documentation
pip install mkdocs-material
mkdocs serve
Then open http://127.0.0.1:8000 to browse the full documentation site.
License
MIT - see LICENSE
Author
Grace Peter Mutiibwa · gracepeter.clearnique.com · GitHub
1 maintainer
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