python type_error ai_generated true

TypeError: Object of type 'datetime' is not JSON serializable

ID: python/flask-jsonify-serialization-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

尝试将 datetime 对象直接传递给 jsonify()。

generic

中文

尝试将 datetime 对象直接传递给 jsonify()。

Workarounds

  1. 95% success 
    from flask.json import JSONEncoder
class CustomJSONEncoder(JSONEncoder):
    def default(self, obj):
        if isinstance(obj, datetime):
            return obj.isoformat()
        return super().default(obj)
app.json_encoder = CustomJSONEncoder

Dead Ends

Common approaches that don't work:

  1. 60% fail

    会丢失日期格式，且不适用于所有情况

  2. 90% fail

    同样无法序列化 datetime