go data_error ai_generated true

error: json: cannot unmarshal null into Go value of type string

ID: go/json-cannot-unmarshal-null-into-string

Also available as: JSON · Markdown · 中文
80%Fix Rate
88%Confidence
0Evidence
2024-02-25First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
1.17 active — — —

Root Cause

The JSON data contains a null value for a field that is expected to be a string, but the struct field is not a pointer or does not handle null.

generic

中文

JSON 数据中的字段为 null，但对应的结构体字段是字符串类型，且未使用指针或处理 null 的方式。

Workarounds

  1. 95% success 
    Use a pointer to string (*string) for nullable fields.
  2. 90% success 
    Implement a custom UnmarshalJSON method to handle null.

Dead Ends

Common approaches that don't work:

  1. 80% fail

    This loses type safety and may cause runtime type assertions to fail.

  2. 70% fail

    This is inefficient and may alter the meaning of the data.