Fructose

Overview

Fructose is a Python package that uses decorators and type hints to create a strongly-typed interface for LLM calls. It wraps any function with a typed signature, converting it into a structured LLM invocation that returns predictable outputs.

Best for

Best for
Python developers who want reliable, typed interfaces for LLM calls in their applications

Use cases

• Defining typed LLM functions for data extraction and classification
• Integrating LLM calls into existing Python codebases with type safety
• Building reliable LLM pipelines that produce structured outputs

Notes

Fructose is a Python package that uses decorators and type hints to create a strongly-typed interface for LLM calls. It wraps any function with a typed signature, converting it into a structured LLM invocation that returns predictable outputs.

750 stars on GitHub. Last updated 2024-04-17. Licensed Apache-2.0.

Use cases

• Defining typed LLM functions for data extraction and classification
• Integrating LLM calls into existing Python codebases with type safety
• Building reliable LLM pipelines that produce structured outputs

Pros

• Strong typing ensures predictable and verifiable outputs
• Simple decorator-based API minimizes boilerplate
• Works seamlessly with Python type checkers for early error detection

Cons

• Limited to Python; no direct support for other languages
• May restrict flexibility for complex or dynamic prompting patterns
• Depends on the LLM’s ability to correctly follow structured output instructions

Indexed from awesome-langchain and enriched against its public facts.