Posts Tagged: pydantic
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FastAPI Framework: Python ASGI Microframework Tutorial
FastAPI tutorial: installation, hello world app, Pydantic models, databases, dependencies, testing, deployment. Benchmarks vs Flask and Django.
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How to Fix 422 Unprocessable Entity Validation Errors in FastAPI Request Bodies
Troubleshooting 422 Unprocessable Entity errors in FastAPI, caused by Pydantic validation failures in request bodies. Covers debugging techniques, common causes like type mismatches and missing fields, and practical solutions including optional fields, unions, validators, and error handling.
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How to Reduce FastAPI JSON Response Time by 40% Using orjson Instead of stdlib json
FastAPI orjson integration: 40% faster JSON responses (28ms → 17ms p99 avg). Custom ORJSONResponse class, benchmarks uvicorn Python 3.13, 10k req/s load. Pydantic v2 auto-detects orjson. Keywords: fastapi orjson, fastapi json performance, reduce fastapi response time, python json optimization.
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Pydantic v2 Migration in FastAPI: Fixing model_validator Decorator Breaking Changes
Pydantic v2 @model_validator(mode='before') receives model instances in some cases like field assignment. Fixes for FastAPI migration, including code examples and tests.