> ## Documentation Index
> Fetch the complete documentation index at: https://langchain-5e9cc07a-preview-toolre-1772123259-dfebfdb.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Middleware integrations

> Integrate with middleware using LangChain JavaScript.

Middleware designed for specific providers. Learn more about [middleware](/oss/javascript/langchain/middleware/overview).

| Provider                                                       | Middleware available |
| -------------------------------------------------------------- | -------------------- |
| [Anthropic](/oss/javascript/integrations/middleware/anthropic) | Prompt caching       |

***

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