python data_error ai_generated true

json.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

ID: python/starlette-request-body-parsing

Also available as: JSON · Markdown · 中文
80%Fix Rate
83%Confidence
0Evidence
2024-04-14First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.x active — — —

Root Cause

Request body is empty or not valid JSON when trying to parse with request.json().

generic

中文

请求体为空或不是有效的 JSON，但尝试用 request.json() 解析。

Workarounds

  1. 90% success 
    Check content-type first: if request.headers.get('content-type') == 'application/json':
    data = await request.json()
else:
    return JSONResponse(status_code=415)
  2. 85% success 
    Use a middleware to parse JSON and handle errors gracefully.

Dead Ends

Common approaches that don't work:

  1. 50% fail

    Works but masks the root cause; better to validate request content type.

  2. 60% fail

    body() returns bytes; need to decode and json.loads.