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Mocktail

Free, open-source mock API server with a built-in dashboard

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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 agents can create and manage mocks directly, along with an optional built-in AI assistant using your own API key. Both are completely optional.It’s been fun coming back to something I built years ago and bringing it up to date. I’d love to hear what you think, especially anything you’d change or add.

HN · launched Aug 14, 2026 · 25 upvotes (top 21%) · 0 views

Niche: api testing and mocking tools · 85 launches, 7 in the last 7 days ▼ -22% · Explore this niche →

Category and tags
  • Horizontal
  • Dev tools
  • Developer
  • Not AI
  • Hobby / open-source project

Visit website ↗ Source listing ↗

More like this: all 85 launches in api testing and mocking tools →

Could you build this?

Yes It is a self-hosted mock API server with a web UI and SQLite database that lets users define endpoints and mock data, easily vibe-codeable using Go or Node.js.

Discussion

1 comment analyzed.

Competitors

Other products that read as similar to this one : 103 launches clear the similarity bar, closest 8 shown.

Attention rank: #21 of 104 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).

Launched 283 days after the earliest competitor.

Related data

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