> For the complete documentation index, see [llms.txt](https://docs.n8n.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.n8n.io/integrations/builtin/cluster-nodes/root-nodes/n8n-nodes-langchain.chainsummarization.md).

# Summarization Chain

Learn how to use the Summarize Chain node in n8n. Follow technical documentation to integrate Summarize Chain node into your workflows.

Use the Summarization Chain node to summarize multiple documents.

On this page, you'll find the node parameters for the Summarization Chain node, and links to more resources.

## Node parameters <a href="#node-parameters" id="node-parameters"></a>

Choose the type of data you need to summarize in **Data to Summarize**. The data type you choose determines the other node parameters.

* **Use Node Input (JSON)** and **Use Node Input (Binary)**: summarize the data coming into the node from the workflow.
  * You can configure the **Chunking Strategy**: choose what strategy to use to define the data chunk sizes.
    * If you choose **Simple (Define Below)** you can then set **Characters Per Chunk** and **Chunk Overlap (Characters)**.
    * Choose **Advanced** if you want to connect a splitter sub-node that provides more configuration options.
* **Use Document Loader**: summarize data provided by a document loader sub-node.

## Node Options <a href="#node-options" id="node-options"></a>

You can configure the summarization method and prompts. Select **Add Option** > **Summarization Method and Prompts**.

Options in **Summarization Method**:

* **Map Reduce**: this is the recommended option. Learn more about [Map Reduce](https://js.langchain.com/v0.1/docs/modules/chains/document/map_reduce/) in the LangChain documentation.
* **Refine**: learn more about [Refine](https://js.langchain.com/v0.1/docs/modules/chains/document/refine/) in the LangChain documentation.
* **Stuff**: learn more about [Stuff](https://js.langchain.com/v0.1/docs/modules/chains/document/stuff/) in the LangChain documentation.

You can customize the **Individual Summary Prompts** and the **Final Prompt to Combine**. There are examples in the node. You must include the `"{text}"` placeholder.

## Templates and examples <a href="#templates-and-examples" id="templates-and-examples"></a>

[Browse Summarization Chain node documentation integration templates](https://n8n.io/integrations/summarization-chain) or [search all templates](https://n8n.io/workflows/)

## Related resources <a href="#related-resources" id="related-resources"></a>

Refer to [LangChain's documentation on summarization](https://js.langchain.com/docs/tutorials/summarization/) for more information about the service.

View n8n's [Advanced AI](/build/integrate-ai.md) documentation.