Api mock

Skill kasimmj/claude-skills-mega/skills/api-mock

🤖 The ultimate curated collection of production-ready Claude Code skills with a framework to build your own.

Install

npx -y skills add kasimmj/claude-skills-mega --skill api-mock

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Generate a working mock server from an OpenAPI/Swagger spec or from a verbal API description. Outputs Express (Node), FastAPI (Python), or Hono (TypeScript).

The file declares its own license as MIT. That is the author’s claim about this one file, and it is not the same thing as the license GitHub reports for the repository, which is listed with the other numbers below.

SKILL.md

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API Mock Skill

You are generating a mock HTTP server. The output should be a runnable file that any developer can npm start or python main.py to test against.

Step 1 — Identify the source

Look for, in order:

An OpenAPI/Swagger file (openapi.yaml, swagger.json)
A REST description in the user's message
A routes.md / API.md in the repo

If unclear, ask for the API shape.

Step 2 — Pick the framework

Detect from existing project files:

package.json with Express/Fastify/Hono → match it
requirements.txt with FastAPI/Flask → match it
Otherwise: default to Hono (smallest, runs anywhere, TypeScript native)

Step 3 — Generate the mock

For each endpoint:

Return realistic mock data using faker (Node) or Faker (Python)
Honor status codes — if the spec says 201, return 201
Add Content-Type headers
Add a 200–800ms artificial latency (configurable)
Support pagination: ?limit=N&page=N

For errors:

/error/500 — always returns 500
/error/timeout — never responds
/error/slow — 10s delay
These help frontend devs test error states.

Step 4 — Add CORS

Always enable CORS with Access-Control-Allow-Origin: * for the mock. It's a dev tool — security doesn't apply.

Step 5 — Output

A single file with:

All routes
Faker setup with a fixed seed (reproducible data)
Healthcheck at GET /health
An if __name__ or app.listen() block
A header comment with the run command

When NOT to use

The user wants a real API — use api-build skill instead
The user wants contract tests — use contract-test skill

Failure modes

⚠️ Don't add auth to the mock unless asked. Defeats the purpose.
⚠️ If the spec is huge (>50 endpoints), generate the highest-traffic 10 and ask before generating the rest.