Hasura

The engine provides an instant GraphQL API layer over PostgreSQL and other supported databases, exposing data through a single, composable endpoint. It adds fine‑grained access control and can emit webhooks in response to database events, enabling real‑time data flows without custom server code. The project is open source under Apache‑2.0, can be self‑hosted, and includes a free tier for development use.

Developers building modern web, mobile, or AI‑driven applications use it to replace hand‑written resolvers and REST services, gaining immediate CRUD capabilities and subscription‑style updates. The V3 release extends support to MongoDB, ClickHouse, and MS SQL Server, and offers connector SDKs for custom business logic in TypeScript, Python, and Go. V2 remains the stable version for production workloads.

What distinguishes the engine is its focus on rapid data delivery: a single API endpoint handles queries, mutations, and event‑driven webhooks while enforcing role‑based permissions. All connectors and the core engine are released under the same permissive license, and the project maintains active community channels for support and contributions.