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The stuff documents chain ("stuff" as in "to stuff" or "to fill") is the most straightforward of the document chains. It takes a list of documents, inserts them all into a prompt and passes that prompt to an LLM.

This chain is well-suited for applications where documents are small and only a few are passed in for most calls.


Here's how it looks in practice:

npm install @langchain/openai
import { OpenAI } from "@langchain/openai";
import { loadQAStuffChain } from "langchain/chains";
import { Document } from "@langchain/core/documents";

// This first example uses the `StuffDocumentsChain`.
const llmA = new OpenAI({});
const chainA = loadQAStuffChain(llmA);
const docs = [
new Document({ pageContent: "Harrison went to Harvard." }),
new Document({ pageContent: "Ankush went to Princeton." }),
const resA = await{
input_documents: docs,
question: "Where did Harrison go to college?",
console.log({ resA });
// { resA: { text: ' Harrison went to Harvard.' } }

API Reference: