LangExtract

LangExtract is a Python library that uses LLMs to extract structured information from unstructured text based on user-defined instructions. It processes domain-specific materials — such as clinical notes and reports — identifying and organizing key details while keeping each extracted data point traceable to its source. The extracted entities can be exported as a .jsonl file, a standard format for language model data and visualized through an interactive HTML interface for contextual review. Our teams evaluated LangExtract for extracting entities to populate a domain knowledge graph and found it effective for transforming complex documents into structured, machine-readable representations.