PGLite

PGLite delivers a complete PostgreSQL database, compiled to WebAssembly (WASM), running directly in-browser, Node.js, Bun, or Deno environments.

PGLite is real PostgreSQL: a lightweight WASM build packaged as a TypeScript library. It runs fully in-process—no separate server required—and the gzipped binary is under 3MB. This allows developers to deploy full Postgres features (JSONB, CTEs, `pgvector` extension support) for local-first applications and edge runtimes. Persistence is handled via IndexedDB in the browser or the native filesystem in Node/Bun. Note: PGLite is designed for a single, exclusive connection, making it ideal for a browser tab or worker, not a multi-client production cluster.

https://pglite.dev