[](https://js.langchain.com/docs/tutorials/extraction/): LLM should read this page when: - Building an information extraction application - Learning how to extract structured data from unstructured text - Needing to handle multiple entities or long text during extraction 'This guide covers how to build an extraction chain using LangChain to extract structured information from unstructured text. It explains how to define a schema, create an extractor, handle multiple entities, and use reference examples to improve performance. It also mentions additional resources for handling long text and using parsing approaches.'

