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BrianGTRxx

api-mock-sandbox

by BrianGTRxx
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API Mock Sandbox

An MCP server that gives Claude two tools for spinning up a local, persistent REST mock API on demand: describe the data you need in plain language, get a working CRUD backend a few seconds later, with data that survives restarts because it's written to disk instead of kept in memory.

Full documentation, in English and Spanish, lives in docs/:

Quick start

npm install
npm run build

Then register it in claude_desktop_config.json:

{
  "mcpServers": {
    "api-mock-sandbox": {
      "command": "node",
      "args": ["ABSOLUTE_PATH_TO_PROJECT/dist/index.js"]
    }
  }
}

Restart Claude Desktop, then ask it to set up a mock API for whatever you're building. See the full guide for tool parameters, the REST endpoint reference, and troubleshooting.

Before you plan a project around Claude Artifacts calling this API: they can't. Published Artifacts run in a CSP sandbox that silently blocks requests to localhost. Read docs/en/LIMITATIONS.md for why, and for the local test console (public/index.html, served at http://localhost:<port>/) that works instead.

License

MIT

Built with Claude Code.