Mocksmith
Mock APIs in minutes: describe your API in plain language or build it in the visual builder, and get realistic CRUD endpoints.
Mocksmith solves a problem I hit on almost every project: the front-end is ready to consume an API, but the backend does not exist yet. So you hand-roll a frozen JSON file, code a fake server, or wait. Mocksmith does that work for me. Either I describe my API in plain language and the AI forges the spec (Pro plan), or I build it in a visual builder: resources, fields, data types, value ranges, constants, compliance regex, relations between resources. From that spec, Mocksmith materialises realistic data and serves full CRUD endpoints, with pagination and Bearer-key protection. The architecture strictly separates two paths: spec generation, slow and one-off, the only place that touches an LLM, and serving the mocks at runtime, fast, deterministic, with no AI call at all. Data is seeded, so it is stable: the same spec always returns the same data, which keeps tests from breaking on every reload. It is also my first project with real billing: a generous Free plan and a Pro plan at 2.99 € per month for AI generation and network simulation.
Preview
Features
- Visual builder with 94 data types: resources, fields, value ranges, constants, regex and relations
- Full CRUD, pagination and persistent state: a POST really creates, a DELETE really deletes
- Realistic, stable data: seeded, the same spec always returns the same data
- Per-project Bearer API keys: the token is shown only once, only its SHA-256 hash is stored
- OpenAPI 3.1 import and export
- AI generation (Pro): describe your API in plain language, the spec is forged then validated with zod
- Network simulation (Pro): latency and random errors to stress your front-end's edge cases
- Pinned responses per endpoint (Pro)
Stack
Platforms