python type_error ai_generated true

fastapi.exceptions.RequestValidationError: field required (type=value_error.missing)

ID: python/fastapi-validation-error-missing-field

Also available as: JSON · Markdown · 中文
80%Fix Rate
85%Confidence
0Evidence
2024-02-10First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.x active — — —

Root Cause

A required field in the request body or query parameters is missing.

generic

中文

请求体或查询参数中缺少必填字段。

Workarounds

  1. 95% success Add the missing field in the request body or query parameters with a valid value. 
    {"name": "John", "age": 30}  # Include all required fields
  2. 85% success Modify the Pydantic model to make the field optional with a default value. 
    from pydantic import BaseModel
class Item(BaseModel):
    name: str = None  # Optional with default

Dead Ends

Common approaches that don't work:

  1. Setting the field as Optional in the Pydantic model but not providing a default value. 60% fail

    Optional without default still requires the field in validation; it only allows None.

  2. Ignoring the error and sending the same request again without changes. 95% fail

    The request is still malformed; the error will persist.