hnswlib-node

Overview

hnswlib-node is a JavaScript/TypeScript SDK providing Node.js bindings to HNSWLib for approximate nearest-neighbor vector search.

SDK Features

• Async operations for non-blocking queries
• Multi-threading support
• Distance metrics: L2 (Euclidean), Cosine, Inner Product
• File persistence: save/load indices to disk
• Custom filter functions
• LangChain vector store integration

Use Cases

• Integrate vector search into Node.js web apps
• Serverless RAG pipelines
• Real-time recommendation systems
• Semantic search backends

Comparisons

• Official community JS bindings vs. Python hnswlib
• Lighter than full DBs (e.g., Chroma, LanceDB) for JS stacks

Installation

npm install hnswlib-node

Pricing

Free and open-source (Apache 2.0).