go type_error ai_generated true

error: json: cannot unmarshal object into Go value of type map[int]string

ID: go/encoding-json-unmarshal-into-map-with-non-string-key

Also available as: JSON · Markdown · 中文
80%Fix Rate
82%Confidence
0Evidence
2024-02-25First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
1.20 active — — —
1.21 active — — —

Root Cause

JSON object keys are always strings, but the target map has non-string key type like int.

generic

中文

JSON对象键始终是字符串，但目标映射具有非字符串键类型如int。

Workarounds

  1. 90% success Use map[string]interface{} and then convert keys 
    var raw map[string]interface{}
json.Unmarshal(data, &raw)
result := make(map[int]string)
for k, v := range raw {
    i, _ := strconv.Atoi(k)
    result[i] = v.(string)
}

Dead Ends

Common approaches that don't work:

  1. Using string key map and converting manually 40% fail

    Works but inefficient; use map[string]interface{} and convert.