Mock APIs in seconds ⚡ Import OpenAPI/Postman, Faker + AI data, webhooks & callbacks, offline CLI. Free plan, no credit card.
The best API mock tool ➡️
Joined February 2023
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Your Postman collection already describes your API. It just lives in one person's workspace.
Import it into Mockfly and frontend, QA and CI all hit the same hosted mock. Then add the 404s and edge cases nobody saved as examples.
How it maps: mockfly.dev/articles/postman…
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Sunday honesty check: the endpoint you need isn't built yet. What do you actually do?
0%Hardcode JSON
0%MSW or json-server
0%Hosted mock API
0%Wait and refresh Slack
0 votes • Final results 12
Saturday tip: if your frontend suite depends on shared staging, you're borrowing someone else's outage calendar.
Pin the contract locally—happy / empty / 401—and keep staging for true integration. Overnight CI gets a lot quieter.
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Most mock bugs aren't bad JSON.
They're the wrong response firing: rule order, a disabled branch, proxy left on.
We added a Flow tab that draws the decision path for a request — so you stop reverse-engineering your own config from the network panel.
mockfly.dev
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Payment gateways answer 202, then call your webhook later. That's where the bugs hide: unsigned requests, double charges on retries, UIs stuck on "processing".
New guide: mock the whole flow, callback, HMAC check and retry tests included 👇
mockfly.dev/articles/test-pa…
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Got an OpenAPI spec but no backend yet? You can have a working mock API in about 5 minutes.
Paths become endpoints, tags become folders, and response data comes from your examples first, then your schemas, then Faker placeholders.
mockfly.dev/articles/openapi…
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Your UI handles the happy path. Cool.
Now try:
- a 500 on the second request
- a response that takes 30s
- an empty array
- a 200 with an error in the body
Which one breaks your frontend first? 😅
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Your UI works great... until the API returns a 429.
We wrote up how to reproduce 401s, 422s, rate limits, flaky 500s and timeouts on demand with a mock API, plus the client code that handles each one:
mockfly.dev/articles/simulat…
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Mockfly retweeted
Este recurso para desarrolladores es TOP.
Mockfly crea APIs de prueba en segundos:
- Métodos POST, DELETE o lo que necesites
- Usa datos aleatorios para la respuesta
- Compatible con HTTPS
- Sin despliegues
🔗 mockfly.dev
ALT Una captura de la aplicación de Mockfly
🤖 Discover the power of AI-powered JSON generation in #MockFly! Easily create dynamic responses with text descriptions for more realistic API mocking.
mockfly.dev/articles/ai-json…
#AI #APITesting #mock
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🚀 Introducing dynamic mock API responses! Explore our in-depth guide to learn how custom rules can elevate your testing & development experience and create flexible, realistic scenarios.
mockfly.dev/articles/mock-dy… #APITesting #DevTools
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🎉 Exciting news! We've just released a new feature on our platform - now you can log in using your GitHub account! 🚀 Try it out today!
mockfly.dev
Improve your #API development process with Mockfly! 🚀🤖 Check out this article to learn more about API mocking and why Mockfly is a cool option. #softwaredevelopment #webdevelopment #coding
mockfly.dev/articles/api-moc…
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Hey everyone, we're excited to join Twitter and share our journey with you! Start things off by checking out this article on Getting Started with Mockfly:
mockfly.dev/articles/getting…