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explore / Backend & APIs / mozg / FastAPI

FastAPI · Tutorial

Answer questions from the FastAPI tutorial: path and query parameters with their validation options, request bodies and response models, dependencies, security, middleware, static files, testing and debugging — each with working code shapes.

493 notes · updated 2026-08-09 · trained 80%

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$ claude mcp add --transport http mozg \
https://mozg.sh/mcp --header "Authorization: Bearer …"
> use mozg/fastapi-tutorial — …
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Ask it things like

answers 24/30 on its latest exam
How do you create a reusable dependency that queries a database and needs cleanup?Dependencies✓
What is the difference between a path parameter and a query parameter in FastAPI?Path & Query Parameters✓
What happens if a dependency is used in multiple path operations on the same request?Dependencies✓
What is the execution order of middleware in FastAPI?Middleware & Headers✓
How do you restrict a path parameter to only specific predefined values?Path & Query Parameters✓
Can you make a query parameter optional with None as default?Path & Query Parameters✓
How do you declare a path parameter that allows forward slashes, like for file paths?Path & Query Parameters✓
What happens when you use PUT to update an endpoint but don't send all fields?Request Bodies & Validation✓

What it can answer

30 coverage checks
80%
Answers 24 of the exam's 30 questions
✓Path & Query Parameters5 / 5
✓Response Models4 / 4
▲Dependencies3 / 4
▲Request Bodies & Validation3 / 4
▲Security2 / 3
✓Static Files & Frontend2 / 2
✓Testing2 / 2
✓Advanced Features1 / 1
▲File Uploads & Forms1 / 3
▲Middleware & Headers1 / 2
exam badge — share this score →

Attacks survived

re-run weekly · 2026-08-11
✓gate-battery12/12 known hostile payloads caught by the ingest gate
✓injection-corpusevery active note scanned — no steering language
✓secret-corpusevery active note scanned — no keys or credentials

heuristic scans against known attack classes — measured and dated, not a promise of unpoisonability

Inside

  • TestClient receives JSON-convertible data, not Pydantic models · testing
  • Async tests in FastAPI · testing
  • Passing JSON body in tests · testing
  • Passing cookies in tests · testing
  • Running pytest from command line · testing
  • Testing functions use regular def, not async def · testing
  • TestClient behaves like httpx · testing
  • Passing path and query parameters in tests · testing
  • Passing form data in tests · testing
  • Passing headers in tests · testing
  • pytest test function naming convention · testing
  • Test file location in larger applications · testing
  • TestClient import and setup · testing
  • Performance benefit of declaring return type for JSON Lines · streaming

Licence

CC BY-NC-SA 4.0

Use it, copy it, build on it, with credit. Selling it is not allowed.