Prism

What it does

Work with your API before you write any code Prism is an open-source HTTP mock server that can mimic your API's behavior as if you already built it. Mock HTTP servers are generated from your OpenAPI v2/v3 (formerly known as Swagger) documents.

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  Prisma2018 · ▲521

  Build a GraphQL server with any database

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  Mockit – Open-source app to create and configure HTTP mocked endpoints2019 · mockit.netlify.com · ▲158
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  Mocktail – Free, open-source mock API server with a built-in dashboard25d ago · getmocktail.com · ▲25

  Hi HN, I built the first version of Mocktail years ago. I recently came back to the project, and after a pretty substantial rebuild, v4 is now out. Mocktail is a free and open-source, self-hosted mock API server with a built-in dashboard and database, packaged as a single ~25 MB binary. You can run it locally or on your own infrastructure — no account or hosted service required. You can define endpoints and responses, generate realistic data per request, customize headers, status codes and latency, and inspect incoming requests in real time. With v4, I also added MCP support, so coding…

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  Mocklets2018 · ▲82

  A HTTP-based API simulator to assist parallel development 🛠️

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  MocklineMar 2026 · mockline.xyz · ▲5

  Instant Mock APIs from OpenAPI Specs

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  OpenAPI mocks that don't suck – realistic test data, quick setup2025 · beeceptor.com · ▲13

  Hi HN! I'm Ankit, the founder of Beeceptor, a request mocking and intercepting tool. This time, I built something new to address a pain I’ve personally felt (and heard from dozens of QA, frontend, and platform teams): making OpenAPI specs actually useful during development. API contracts just sit around as docs often. What if you could 'activate' them, instantly have a realistic, hosted mock server-with contract validation, smart test data, and early usage? So I made _Mockaroo for OpenAPI_, but with brains. It spins up a hosted mock server from your spec in one click. It: - Generates…

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  Dograh▲592

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  Meridian▲530

  Don't let your work go unnoticed. Get promoted!

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  The AI-Native DevOps Workspace.

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  Track your AI visibility for free (using your own API keys!)

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  LLM that exhibits human-level performance

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  Anonymous sexual health app for men

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  BBC “In Our Time”, categorised by Dewey Decimal, heavy lifting by GPT▲688

  I'm a big fan of the BBC podcast In Our Time -- and (like most people) I've been playing with the OpenAI APIs. In Our Time has almost 1,000 episodes on everything from Cleopatra to the evolution of teeth to plasma physics, all still available, so it's my starting point to learn about most topics. But it's not well organised. So here are the episodes sorted by library code. It's fun to explore. Web scraping is usually pretty tedious, but I found that I could send the minimised HTML to GPT-3 and get (almost) perfect JSON back: the prompt includes the Typescript definition. At the same time I…

  AI · 2023 · genmon.github.io