Generate mock API servers for testing and development with realistic response data. Use when creating mock APIs for development and testing. Trigger with phrases like "create mock API", "generate API mock", or "setup mock server".
npxskills add jeremylongshore/claude-code-plugins-plus-skills--skill mocking-apisLoading…
Generate mock API servers from OpenAPI specifications that return realistic, schema-compliant response data for development and testing. Support dynamic response generation with Faker.js data, configurable latency simulation, stateful CRUD behavior, and request recording for contract testing validation.
See ${CLAUDE_SKILL_DIR}/references/implementation.md for the full implementation guide.
${CLAUDE_SKILL_DIR}/mocks/server.js - Mock server entry point with route registration${CLAUDE_SKILL_DIR}/mocks/fixtures/ - Per-endpoint response fixture JSON files${CLAUDE_SKILL_DIR}/mocks/generators/ - Dynamic response generators using Faker.js${CLAUDE_SKILL_DIR}/mocks/scenarios/ - Error scenario configurations (4xx, 5xx responses)${CLAUDE_SKILL_DIR}/mocks/state.js - In-memory state store for CRUD behavior${CLAUDE_SKILL_DIR}/mocks/recordings/ - Captured request logs for contract testing${CLAUDE_SKILL_DIR}/docker-compose.mock.yml - Docker configuration for mock server| Error | Cause | Solution |
|---|---|---|
| Schema mismatch | Mock response does not match updated OpenAPI spec | Run spec-to-fixture sync on spec change; add CI check comparing fixture schemas |
| Missing endpoint | Consumer requests path not defined in OpenAPI spec | Return 501 with message listing available endpoints; log unknown path for spec update |
| Stale fixtures | Mock data becomes unrealistic after API schema evolution | Regenerate fixtures from latest spec; use generators over static fixtures for evolving APIs |
| Port conflict | Mock server port already in use by another dev service | Make port configurable via environment variable; default to spec-defined server URL port |
| State leak between tests | Stateful mock retains data from previous test run | Reset in-memory state before each test suite; expose POST /mock/reset admin endpoint |
Refer to ${CLAUDE_SKILL_DIR}/references/errors.md for comprehensive error patterns.
Frontend parallel development: Launch a Prism mock server from the OpenAPI spec so frontend developers can build against realistic API responses while backend implementation is in progress.
Integration test isolation: Use MSW (Mock Service Worker) to intercept HTTP requests in Node.js test suites, returning fixture responses without network calls, with per-test response customization.
Contract testing: Record all requests to the mock server during frontend E2E tests, then replay them against the real backend to verify the mock accurately represents actual API behavior.
See ${CLAUDE_SKILL_DIR}/references/examples.md for additional examples.
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Set up and use 1Password CLI (op). Use when installing the CLI, enabling desktop app integration, signing in (single or multi-account), or reading/injecting/running secrets via op.
CLI to manage emails via IMAP/SMTP. Use `himalaya` to list, read, write, reply, forward, search, and organize emails from the terminal. Supports multiple accounts and message composition with MML (MIME Meta Language).
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Set up and use 1Password CLI (op). Use when installing the CLI, enabling desktop app integration, signing in (single or multi-account), or reading/injecting/running secrets via op.
CLI to manage emails via IMAP/SMTP. Use `himalaya` to list, read, write, reply, forward, search, and organize emails from the terminal. Supports multiple accounts and message composition with MML (MIME Meta Language).