> ## Documentation Index
> Fetch the complete documentation index at: https://docs.langchain.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Middleware integrations

> Integrate with middleware using LangChain JavaScript.

Browse available middleware for different providers or contribute your own to the ecosystem. Learn more about how middleware works in the [middleware overview](/oss/javascript/langchain/middleware/overview) and how to use middleware with Deep Agents in the [Deep Agents docs](/oss/javascript/deepagents/customization#middleware).

## Share your middleware

Middleware enables context engineering, harness customization, and runtime safety controls. It is a useful extension point in LangChain and we love highlighting what the community builds with it:

<CardGroup cols={2}>
  <Card title="Add an official integration" icon="package" href="/oss/javascript/contributing/implement-langchain#middleware">
    Follow the contributing guide to build and publish a middleware package.
  </Card>

  <Card title="Share a community middleware" icon="users" href="https://github.com/langchain-ai/docs">
    Open a PR to the docs repo to add your middleware to the table below.
  </Card>
</CardGroup>

## Official integrations

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

## Community integrations

| Middleware                                                                            | Description                                                                                                                                              | Source                                                                                                  |
| ------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------- |
| [langchain-task-steering](https://github.com/edvinhallvaxhiu/langchain-task-steering) | Implicit state-machine middleware for ordered task pipelines with per-task tool scoping, dynamic prompt injection, and composable completion validation. | [`edvinhallvaxhiu/langchain-task-steering`](https://github.com/edvinhallvaxhiu/langchain-task-steering) |

Have a middleware to share? [Open a PR](https://github.com/langchain-ai/docs) to add it here.

***

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