FastAPI: 422 Unprocessable Entity - Request body validation failed
{"detail":[{"loc":["body","user","email"],"msg":"value is not a valid email address","type":"value_error.email"}]}
Immediate Remediation
bash
Use EmailStr from pydantic[email] and ensure request Content-Type is application/json with matching schema.
Root Cause Analysis
Encountered in FastAPI / Pydantic when standard configuration or runtime constraints are violated.
Verification & Guardrails
- Verify dependencies and runtime version compatibility.
- Ensure clean build artifact state.
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