MockDeck
Generate a mock API from a one-line description.
MockDeck turns a one-line endpoint description into a mock API spec — OpenAPI 3, Postman, or raw routes — with realistic sample responses so frontend teams build before the backend is ready.
Describe an endpoint and get a mock API spec - OpenAPI 3, Postman, or raw routes - with realistic sample responses so your frontend team can build before the backend is ready.
What each run produces
- OpenAPI 3 / Postman / raw output
- Realistic sample responses
- Auth style included
How does MockDeck build a mock from one line?
Describe an endpoint in plain language and MockDeck produces a mock API spec from it. You skip writing the contract by hand and get a working stub your team can call immediately.
Which mock formats does it export?
It exports OpenAPI 3, Postman, or raw routes, so the mock fits whatever your frontend or QA tooling already consumes. The same description becomes the format your pipeline expects.
Are the sample responses realistic?
MockDeck generates realistic sample responses, not just empty shells, so the frontend sees plausible data shapes and can build UI states against them before the real backend exists.
Does it include authentication style?
Yes. The generated spec includes an auth style, so the mock reflects how the real endpoint will expect callers to authenticate rather than ignoring security.
When you should write it yourself instead
MockDeck does one thing well: Generate a mock API from a one-line description. It automates one small step, but it is not a substitute for testing and review. Check its output against your real setup before you rely on it.
What you get
- One-line description to mock spec
- OpenAPI 3 / Postman / raw
- Realistic sample responses
- Auth style included
Questions about output quality
What is MockDeck?
MockDeck is a developer tool that turns a one-line endpoint description into a mock API spec with realistic sample responses.
What formats can it export?
It exports OpenAPI 3, Postman, or raw routes, matching common frontend and QA tooling.
Are the mock responses realistic?
Yes. It generates realistic sample responses so the frontend can build against plausible data shapes before the backend is ready.
Does it model authentication?
The generated spec includes an auth style, so the mock reflects how the real endpoint expects callers to authenticate.
When should I use MockDeck?
Use it when the frontend needs to build against an API before the backend is implemented, to unblock parallel work.
Who benefits most?
Frontend and QA teams that need a callable stub early, plus backend teams who want a clear contract from a short description.
When should you not use MockDeck?
Not a replacement for proper testing, CI, and code review. Validate generated code, schemas, and regexes against your real inputs before shipping.
Who is MockDeck for?
MockDeck is built for engineers and small teams who need this exact job done: Generate a mock API from a one-line description.
Built by Xingliang Li · LX Micro-SaaS Factory — a one-person, curated set of tight-vertical AI tools. How tools are selected →