Show HN: Crudio – Turn an OpenAPI spec into a stateful mock back end

Category: devtools

Tags: openapi, mock-server, testing

Score: 6.5/10 (Innovation: 6, Technical: 6, Documentation: 7, Utility: 7)

Crudio generates a stateful, schema-validating mock backend directly from an OpenAPI 3.x spec, bridging the gap between stateless mock servers and CRUD-only tools like json-server. It persists data to disk, validates requests against the API contract, and supports both declarative rules and custom handlers, making it uniquely useful for integration testing and frontend development. With zero initial stars and a very niche focus, it has moderate utility but fills a clear gap in the mock tooling ecosystem.

Target audience: backend devs

Repository: https://github.com/enricodeleo/crudio · JavaScript · MIT

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