Open source. Free forever.
Install the Mockzilla CLI
Turn any OpenAPI spec into a live mock server in seconds. Pick the install method that fits your machine.
The Mockzilla CLI is MIT-licensed and runs offline. Cloud features like hosted simulations and shared catalogs are opt-in.
$
brew tap mockzilla/tap$
brew install mockzillamacOS and Linux. Tap the formula and install.
Run your first mock
Point Mockzilla at any OpenAPI spec, by URL or path, and you have a live simulation on port 2200.
Try one of these specs:
$
mockzilla https://petstore3.swagger.io/api/v3/openapi.json$
mockzilla https://raw.githubusercontent.com/github/rest-api-description/main/descriptions/api.github.com/api.github.com.jsonUse Mockzilla from your AI agent
Mockzilla ships an MCP server so coding agents can spin up mocks, peek specs, and call simulated endpoints on your behalf.
$
claude mcp add -s user mockzilla -- npx -y @mockzilla/mcp@latest$
gemini mcp add -s user mockzilla npx -y @mockzilla/mcp@latestTry asking:
›Spin up a Stripe mock locally on port 8080.
›Show me which endpoints the GitHub OpenAPI spec exposes.
Read the docs
Configuration, packaging, CI integration, and the full CLI reference for the mock server.