Tag: pydantic

2 articles

Fix: Pydantic ValidationError — Field Required, Value Not a Valid Type, or Extra Fields

Mar 22, 2026

How to fix Pydantic v2 validation errors — required fields, type coercion, model_validator, custom validators, extra fields config, and migrating from Pydantic v1.

python pydantic fastapi backend debugging

Fix: Pydantic ValidationError — Field Required / Value Not Valid

Mar 19, 2026

How to fix Pydantic ValidationError in Python — missing required fields, wrong types, custom validators, handling optional fields, v1 vs v2 API differences, and debugging complex nested models.

python pydantic fastapi debugging backend