Retriever integrations

Integrate with retrievers using LangChain JavaScript.

A retriever is an interface that returns documents given an unstructured query. It is more general than a vector store. A retriever does not need to be able to store documents, only to return (or retrieve) them.

Retrievers accept a string query as input and return a list of Document objects.

For specifics on how to use retrievers, see the relevant how-to guides here.

Note that all vector stores can be cast to retrievers. Refer to the vector store integration docs for available vector store retrievers.

All retrievers

Alchemyst AI Retriever

View guide

Knowledge Bases for Amazon Bedrock

View guide

Exa

View guide

HyDE Retriever

View guide

Amazon Kendra Retriever

View guide

Time-Weighted Retriever

View guide

If you’d like to contribute an integration, see Contributing integrations.

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