Cypher.js

Cypher.js is a lightweight, in-memory graph database and partial implementation of the Cypher query language, written in JavaScript for Node.js (v1.0.10). It allows executing Cypher queries via a CLI tool (processing .cql files or interactive shell) or programmatically as a library. Key differentiators: pure JavaScript, no external dependencies, simple callback-based API. However, it is not a full Cypher implementation and lacks transaction support, indexing, and production-grade persistence. Suitable for prototyping or small-scale projects where a full Neo4j instance is overkill.