python data_error ai_generated true

ValueError: Invalid JSON: Expecting property name enclosed in double quotes

ID: python/fastapi-valueerror-json-encode-error

Also available as: JSON · Markdown · 中文
80%Fix Rate
88%Confidence
0Evidence
2024-12-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.x active — — —

Root Cause

Request body contains invalid JSON syntax (e.g., single quotes instead of double quotes).

generic

中文

请求体包含无效的JSON语法（例如单引号而不是双引号）。

Workarounds

  1. 95% success Use proper JSON formatting 
    {"name": "John", "age": 30}
  2. 90% success Use json.dumps() to convert Python object 
    import json
json.dumps({'name': 'John'})

Dead Ends

Common approaches that don't work:

  1. Assuming JSON allows single quotes 90% fail

    JSON standard requires double quotes for strings.

  2. Using Python dict directly in JSON body 70% fail

    Python dict representation is not valid JSON.