Mastering RAG Evaluation: Recall@K, MRR, NDCG, and RAGAS Explained

This article breaks down RAG evaluation into a two‑layer framework, explains the four core metrics—Recall@K, MRR, NDCG, and the four RAGAS scores—shows how to implement them with LangChain.js, highlights common pitfalls, and offers scenario‑specific metric combinations for reliable performance monitoring.

LangChainMRRNDCG

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Mastering RAG Evaluation: Recall@K, MRR, NDCG, and RAGAS Explained