go data_error ai_generated true

json: error calling MarshalJSON for type MyStruct: custom error

ID: go/encoding-json-marshaler-error

Also available as: JSON · Markdown · 中文
80%Fix Rate
81%Confidence
0Evidence
2024-05-25First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
1.20 active — — —

Root Cause

A custom MarshalJSON method returns an error, causing json.Marshal to fail.

generic

中文

自定义 MarshalJSON 方法返回错误，导致 json.Marshal 失败。

Workarounds

  1. 85% success 
    func (m MyStruct) MarshalJSON() ([]byte, error) { if m.Invalid { return nil, errors.New("invalid state") }; return json.Marshal(m.Alias) }

Dead Ends

Common approaches that don't work:

  1. 70% fail

    Loses custom serialization logic, may produce wrong output.

  2. 90% fail

    Panic propagates and crashes the program.