Library / SDK
Guardrails & Structure
Jsonformer
1Generate 2structured 3JSON 4from 5language 6models
the six Ws · specification
W1
Who
Open-source project by Rahul Gupta.
W2
What
Generates JSON that always conforms to a schema.
W3
Where
A Python library wrapping local Hugging Face models.
W4
When
When you need guaranteed valid JSON from a model.
W5
Why
Fills only the value tokens, so structure never breaks.
W6
With
Transformers and a local model.
W7
Watch
Individual-maintained; open-source (MIT), library only. Runs locally with your model; nothing leaves your machine.
alternatives