python data_error ai_generated true

werkzeug.exceptions.BadRequest: 400 Bad Request: Failed to decode JSON object: Expecting value: line 1 column 1 (char 0)

ID: python/flask-json-decode-error

Also available as: JSON · Markdown · 中文
80%Fix Rate
87%Confidence
0Evidence
2024-05-19First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.x active — — —

Root Cause

request.get_json() was called on a request whose body is empty or not JSON (e.g., form-encoded or missing Content-Type).

generic

中文

对空请求体或非 JSON 请求（如表单编码或缺少 Content-Type）调用了 request.get_json()。

Workarounds

  1. 90% success 
    data = request.get_json(silent=True) or {}
  2. 92% success 
    Check request.is_json before parsing: if request.is_json: data = request.get_json()

Dead Ends

Common approaches that don't work:

  1. 60% fail

    Still fails if body is empty or malformed.

  2. 70% fail

    Downstream code then receives None and crashes.