Launched this week
DoppelAPI

DoppelAPI

The digital twin of your be instant mock server from API

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Frontend developers often face a common bottleneck: waiting for the backend API to be ready. DoppelAPI solves this by instantly creating a "Digital Twin" of your future backend directly from your OpenAPI (Swagger) definition. Unlike traditional mock servers that return static, repetitive data, DoppelAPI uses AI-driven data generation to serve realistic, schema-compliant responses (emails, UUIDs, avatars, etc.) on the fly. It feels like interacting with a real production database.
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Free
Launch tags:API•Open Source•GitHub
Launch Team
Framer
Framer
Launch websites with enterprise needs at startup speeds.
Promoted

What do you think? …

Samet Uca
Maker
📌
Hello Product Hunt. I’m Samet, the maker of DoppelAPI. We’ve all been there: The designs are ready, the frontend team is itching to code, but... the backend API isn't built yet. This usually leads to blocking delays, or worse—manually writing massive JSON files and hardcoding fake data (mock: true) all over your codebase. I built DoppelAPI to eliminate this bottleneck once and for all. DoppelAPI acts as the "Digital Twin" of your future backend. It reads your OpenAPI/Swagger definition and spins up a fully functional server instantly. What makes it different? Most mock servers just return static files or random gibberish. DoppelAPI is intelligent: Smart Data: It understands your schema. If you ask for an email, it returns a real-looking email. If you need a UUID, it generates one. Visual Dashboard: No more guessing "what payload should I send?". The built-in dashboard shows you exact request/response examples to copy-paste. Chaos & Latency: Simulate a slow network or server errors with a single flag to test your UI's resilience. It’s a CLI tool designed to be dropped into any project workflow instantly. I’d love to verify if this solves a pain point for you. What’s the most annoying part of mocking APIs in your current workflow? Can’t wait to hear your feedback. Thank you.