Mockzilla turns OpenAPI specifications or plain JSON files into mock APIs for frontend work, integration tests, and demos. It can generate responses from OpenAPI schemas, validate requests, and simulate latency or errors at service or endpoint level. A proxy can forward requests to a real backend while using mocks for routes the backend does not serve. For pull requests, its GitHub Action creates a mock URL, updates it on pushes, and removes it when the branch is gone. Mockzilla records request status and timing, with replay for individual requests or sets. Its MIT-licensed CLI runs offline on a laptop or in CI, while hosted cloud features are optional. The site also lists an MCP server and CLI setup instructions for Claude and Gemini. The Free plan is 0.00 USD per free, but API access is unavailable and request history lasts 2 hours. Hobby costs 10.00 USD per month.
Who it is for
Mockzilla suits developers building frontends, integration tests, or demos against mock APIs. Its listed plans target developers evaluating the service, side projects, solo developers and small teams, and teams with CI pipelines.
What is good
- Imports OpenAPI specifications and plain JSON files
- Simulates latency and errors for testing retries
- Pull request action manages mock URLs by branch
- Offline MIT-licensed CLI can run in CI
- Supports request replay with status and timing
What to know first
- Free plan has no API access
- Free request history lasts 2 hours
- Uploaded content must not contain sensitive data
- Hobby costs 10.00 USD per month
Verdict
Mockzilla offers both hosted mock APIs and an offline CLI, with request validation, fault simulation, and pull-request environments. Note the Free plan's API and history limits, and do not upload sensitive data.
Mockzilla plans and pricing
All plansCompared on API mocking tools
- Free plan
- Yes
- Paid from
- $10/mo
- Dynamic responses
- Yes
- OpenAPI import
- Yes
- Mock data generation
- Yes
- Local deployment
- Yes
- Supported protocols
- HTTP
