Outlines
Structured text generation library using constrained decoding with FSMs.
About
Outlines by the .txt team is a library for structured text generation that constrains LLM decoding with finite-state machines so output always conforms to a schema. It can guarantee valid JSON, regex-matching strings, or selection from a fixed set of choices, and is used by projects and companies including vLLM and Hugging Face. It works across several model backends. Released under the Apache 2.0 license.
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Details
- Category
- AI Agents & Orchestration
- Price
- Free
- Platform
- Local/Desktop
- Difficulty
- Intermediate (3/5)
- License
- Apache-2.0
- Added
- Apr 3, 2026
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