Answer of this topic: https://community.n8n.io/t/troubles-with-langchain-code-root-sub-node/43631

[y.ashkoofaraz]

answer of this topic:

Troubles with LangChain Code root & sub-node

I’m missing something obvious, and hopefully, someone can point me in the right direction. I’m trying to extend the AI options using the LangChain Code nodes. I want to build a few different LangChain nodes, but for the sake of this example, let’s use a custom Document loader. Here’s the code (inside Supply Data) for my custom Document loader (tested and works with built-in AI nodes like In-Memory Vector Store). The output Type of this sub-node has been set to Document: const { Document } = …

const items = this.getInputData(0);
const documentInput = (await this.getInputConnectionData("ai_document", 0));
const response = await documentInput.processAll(items);
return [ {json: { response } } ];