---
title: Ottema StructFix Demo
emoji: 🔧
colorFrom: green
colorTo: yellow
sdk: gradio
app_file: app.py
pinned: true
license: apache-2.0
---

# Ottema StructFix Demo

Repair broken JSON / tool-call output against a typed schema. Model: `ottema/structfix-codet5p-220m` (220M params, Apache-2.0).

## Use cases

- LLM emits invalid JSON → fix it
- Missing required fields → fill or flag
- Wrong enum values → coerce to valid
- Markdown-wrapped output → strip the wrapper
- Partial / truncated JSON → complete it
- Schema-constrained generation recovery

## How it works

The user provides a DSL schema (typed fields with enums and required flags) and a broken output. The model returns a valid JSON object that matches the schema.

## Credits

- [CodeT5+](https://github.com/salesforce/CodeT5) backbone (Apache-2.0)
- Fine-tuning and dataset by [Ottema](https://huggingface.co/ottema)

## Related

- [Collection: Ottema Open Models](https://huggingface.co/collections/ottema/ottema/ottema-open-models-6a3600e6cc0bdc9c01dd68c8)
- [Dataset: structfix-bench](https://huggingface.co/datasets/ottema/structfix-bench)