MockDeckShip frontend against mocks before the backend is ready.
Describe an endpoint. Get OpenAPI 3 / Postman / route mocks with sample responses — review before you integrate.
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Key Takeaways
- OpenAPI 3, Postman, or raw route mocks.
- Realistic sample responses for frontend work.
- Honesty: decision-support mocks — not a production API guarantee.
One description. Every mock format.
Pick the format your stack already speaks — review before you integrate.
MockDeck — definition
MockDeck generates realistic mock APIs from a schema or spec so frontend and agent teams can build against stable fakes without waiting for backend endpoints.
What this is NOT
- Not a backend — mocks are for frontend and agent development.
- Not a guarantee the mock matches your production API.
- Not a contract test — pair mocks with real integration tests.
Review every generated mock against your real API contract before you ship.
Backends aren't ready. Mocks shouldn't wait.
Blocked on the backend
Frontend work stops while endpoints are still being designed or built.
Hand-written fakes drift
Ad-hoc fixtures fall out of sync with the API and quietly break builds.
Spec-writing overhead
Writing OpenAPI by hand slows the first sprint more than it should.
Integration surprises
Shape mismatches surface late, after both sides think they are done.
Describe. Generate. Integrate.
Mock specs with realistic sample responses — review before you integrate.
Mock API spec
OpenAPI 3, Postman, or raw routes from one description.
Realistic sample responses
Copy-paste-ready payloads for frontend and agent work.
Auth style included
None, API key, or Bearer token — declared in the mock.
Deterministic checks
Rule-based validation of your description before generation.
Everything you need to mock an endpoint
Built for frontend and platform teams building ahead of backends.
One-line description to mock spec
OpenAPI 3, Postman, or raw routes from one description.
OpenAPI 3 / Postman / raw
Copy-paste-ready payloads for frontend and agent work.
Realistic sample responses
None, API key, or Bearer token — declared in the mock.
Auth style included
Rule-based validation of your description before generation.
From description to mock in 3 steps
Describe
One line: method, path, and what the endpoint returns.
Generate
Get a mock spec with sample responses and your auth style.
Integrate
Point your frontend or agent at the mock; swap in the real API later.
Describe. Generate. Integrate.
Mock specs with realistic sample responses — review before you integrate.
Blocked on the backend
Frontend work stops while endpoints are still being designed or built.
Mock API spec — OpenAPI 3, Postman, or raw routes from one description.
Try it on this page
or generate below.
Saved history
No testimonials yet — by design
We do not publish customer quotes until real, consented ones exist. Early product, honest claims.
Deterministic checks
Every description is validated by rules before any model runs — no quota needed to see them.
Review before you integrate
Generated mocks are decision-support: compare them against your real API contract.
Honest limits
Free runs 3/day · 15/mo; Pro runs 40/day · 300/mo. No hidden caps.
Honest boundaries
MockDeck is a decision-support drafting aid: review every generated mock against your real API contract before you ship.
Simple plans that scale
All paid plans include
- Mock spec studio (OpenAPI 3 / Postman / raw)
- Realistic sample responses
- Deterministic description checks on every run
- Email support on paid plans — no hidden add-ons for core studio use
- Limited daily AI runs (3/day · 15/mo)
- Studio demo (no extra LLM fee)
- AI included: 40 runs/day · 300/mo (fair use)
- No separate ChatGPT subscription required
- Priority support · 2 months free with yearly
Feature comparison
What each plan includes — quotas reflect the enforced fair-use limits.
| Dimension | Free | Pro | Enterprise |
|---|---|---|---|
| Usage | |||
| AI runs | 3/day · 15/mo | 40/day · 300/mo | 200/day · 3000/mo |
| Report export | Watermarked | Clean export | Clean export |
| Audit log | Not included | ✓ Included | ✓ Included |
| Product | |||
| One-line description to mock spec | ✓ Included | ✓ Included | ✓ Included |
| OpenAPI 3 / Postman / raw | ✓ Included | ✓ Included | ✓ Included |
| Realistic sample responses | ✓ Included | ✓ Included | ✓ Included |
| Auth style included | ✓ Included | ✓ Included | ✓ Included |
| BYOK (your LLM key) | Not included | Not included | ✓ |
| SSO | Not included | Not included | Roadmap |
| Support & compliance | |||
| Support | Community | Priority | Custom SLA |
Already paid? Unlock Pro with your license
Licenses are issued manually after your payment is confirmed: we generate one per paid order and send it to the purchase email, typically within a few hours. Enter it below to activate Pro on this device — no account needed. Nothing yet? Write to lixingliangsy@163.com and reference your order email.
Your questions, answered
What does MockDeck generate?
Mock API specs and sample responses from a short description — decision-support, not a production API guarantee.
How accurate are the generated mocks?
Outputs are decision-support drafts. Validate every mock against your real API contract before production. We do not claim conformance certification.
Can I cancel anytime?
Yes. Self-serve plans cancel anytime; access continues until period end.
Do I need a credit card to start?
No. Start with email signup or Demo mode in the studio, then upgrade when ready.
Do I need my own ChatGPT / OpenAI subscription?
No for Free/Pro. AI runs are included in your plan (fair use) via our platform key. Enterprise can optionally bring your own OpenAI key (BYOK) — configure it at /settings (key stays server-side only).
What is Fair Use / what if I hit the AI limit?
Free is 3 runs/day and 15/month. Pro is 40/day and 300/month. Enterprise is 200/day and 3000/month. Over the cap Studio returns HTTP 429. A labelled demo is opt-in, not a silent fallback.
Is checkout secure?
Payments are processed by Waffo Pancake (merchant of record).
What happens after I pay?
You receive access confirmation; fulfillment is tracked via webhook + order logs.
Quick answers
- One-line description to mock spec
- OpenAPI 3 / Postman / raw
- Realistic sample responses
- Auth style included
- Pricing starts at $0 (Free).
More questions
What does MockDeck generate?
Mock REST and JSON endpoints from OpenAPI or a schema.
Does it support dynamic data?
Yes — faker-style generators and stateful sequences.
Can agents use it?
Yes — agent tool calls can hit the mock to develop offline.
Is it a test double?
It is a contract mock; pair it with the real API in integration.
How is it shared?
A hosted mock URL per project; Enterprise self-hosts.
Does it validate schemas?
It can assert requests and responses against the spec.
Which countries and regions can I use MockDeck in?
As a cloud web app, MockDeck is reachable from any country with internet access; there is no region lock by default. Payment availability via our merchant of record (Waffo Pancake) may vary by processor and region.
Is MockDeck GDPR and privacy compliant?
Your inputs are used only to generate your output and are never sold. Retention, sub-processors, and your rights are described on our Privacy page; Enterprise plans can include a DPA and NDA on request.
What languages does MockDeck support?
The interface and generated results are in English. You can paste input in other major languages wherever the underlying model understands them.
How it compares
| Dimension | Manual | MockDeck |
|---|---|---|
| Speed | Hours to days | Minutes per run |
| Consistency | Varies by person | Same ruleset every run |
| Output | Free-form | Structured, exportable result |
| Best for | Final sign-off | First-pass decision-support |
When not to use: When you need a guaranteed production API contract rather than a decision-support mock.
- Contract-first API mocks (2026) — From the MockDeck blog.
- Mock servers vs OpenAPI examples (2026) — From the MockDeck blog.
- Fleet launch notes — MockDeck ships in the LX AI Micro-SaaS fleet.
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