protoform-engine

Server-side ProtoForm rule engine. The same form schema your frontend renders is re-evaluated on the server (visibility, conditional logic, validation) with semantics identical to the TypeScript engine, verified by a shared conformance suite.

The core engine is pure Python with zero dependencies. Django and DRF are optional integration layers.

pip install protoform-engine          # engine only, works anywhere (FastAPI, Flask, workers)
pip install protoform-engine[django]  # + model mapping helpers
pip install protoform-engine[drf]     # + ProtoFormView (GET schema / PATCH step / POST submit)

from protoform import prepare_form, evaluate_rules, validate_step

prepared = prepare_form(schema)                      # resolve templates, build maps
result = evaluate_rules(prepared, values)            # derived state: visible/required/valid/messages
step = validate_step(prepared, values, "step_1")     # {"valid": bool, "errors": {...}}

See the Django engine reference and the protocol specification.

MIT licensed.

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Credits

Author: IO CORP PTY LTD (Alexander Collins)

License

MIT

Requires

Python >=3.10

Provides Extra

django drf dev

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