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rocksdb-js is a modern Node.js binding for RocksDB, offering full transaction support, lazy range queries, and a TypeScript API. Built for performance and scalability, it enables reliable write-heavy workloads, real-time replication, and high-concurrency applications in Harper 5.0 and beyond.

Harper is now open source, with its core platform released under Apache 2.0 and enterprise features source-available. This shift builds trust, enables community contributions, and positions Harper as a unified, transparent platform for developers and AI-driven applications.

Harper v5's Resource API maps JavaScript class methods directly to HTTP verbs, eliminating routing and translation layers. Tables extend the same Resource class, unifying HTTP handling and data access into one interface. Key v5 additions include pre-parsed RequestTarget objects, Response-aware source caching with stale-while-revalidate support, and async context tracking via getContext().

Harper 5.0 launches with a fully open-source core under Apache 2.0, RocksDB as a native storage engine alongside LMDB, and source-available Harper Pro. This release delivers a unified runtime purpose-built for agentic engineering, from prototype to production.

In this podcast episode, Daniel Roe, lead of the Nuxt framework, shares insights on Nuxt 3, 4, and the upcoming Nuxt 5 release. We discuss open-source development, upgrading Nuxt apps, Vue-powered full-stack web apps, version maintenance, and the future of modern web development.

Semantic caching for LLMs can reduce API costs by 20–70% by reusing similar responses. Combined with deterministic routing and improved retrieval, enterprises can significantly lower LLM usage, though effectiveness varies by workload and improves over time.