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fastapi-patterns

Skill2 starsChanged 7 days agoMITView on GitHub

FastAPI patterns, Pydantic schemas, dependency injection, async correctness, response models, error handling, OpenAPI, and auth. Use whenever the project contains `fastapi` in dependencies, files importing from `fastapi`, `@app.get`/`@router.get` decorators, Pydantic BaseModel subclasses used as request/response types, OR the user asks about FastAPI, Pydantic v2, Depends(), HTTPException, OAuth2PasswordBearer, APIKeyHeader, response_model, even if FastAPI is not mentioned by name.

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SKILL.md

FastAPI patterns

FastAPI 0.141.x, Pydantic 2.13.x (baseline at time of writing). Verify current versions at https://pypi.org/project/fastapi/ and https://pypi.org/project/pydantic/. Adapt advice to the versions in the project's requirements.txt, pyproject.toml, or lockfile.

Install: pip install "fastapi[standard]"

Reference files

FileCovers
pydantic-schemas.mdBaseModel, Field(), field_validator, model_validator, model_config, ConfigDict, separate input/output schemas
dependency-injection.mdDepends(), Annotated pattern, yield dependencies, testing overrides
async-correctness.mdasync def vs def, threadpool behavior, blocking I/O rules
response-models.mdresponse_model, response_model_exclude_unset, separate schemas
error-handling.mdHTTPException, custom exception handlers, status codes
openapi.mdMetadata, tags, disabling docs in production, route decorator params
auth.mdOAuth2PasswordBearer, JWT, APIKeyHeader, HTTPBasic, timing attacks
anti-patterns.mdSeverity-labeled anti-patterns to flag in review

References

Version notes

Checked: 2026-09-26 against https://pypi.org/project/fastapi/ and https://fastapi.tiangolo.com/release-notes/

  • 0.141.1 (2026-07-29) with Pydantic 2.13.5 (2026-08-28): no guidance change. FastAPI stays on 0.x by design; there is no 1.x and no Pydantic 3.
  • 0.128.0: Pydantic v1 compatibility (pydantic.v1 models) removed; unsupported on Python 3.14+.
  • 0.95.0: Annotated form for Depends() became the recommended shape.

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