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A retriever in LlamaIndex is what is used to fetch Nodes from an index using a query string. Aa VectorIndexRetriever will fetch the top-k most similar nodes. Meanwhile, a SummaryIndexRetriever will fetch all nodes no matter the query.

const retriever = vector_index.asRetriever();
retriever.similarityTopK = 3;

// Fetch nodes!
const nodesWithScore = await retriever.retrieve({ query: "query string" });

API Reference