go encoding_error ai_generated true

json: 不支持的类型：map[int]string

json: unsupported type: map[int]string

ID: go/json-marshal-error-unsupported-type

其他格式: JSON · Markdown 中文 · English
90%修复率
87%置信度
1证据数
2024-01-10首次发现

版本兼容性

版本状态引入弃用备注
go1.19 active — — —
go1.20 active — — —
go1.21 active — — —
go1.22 active — — —

根因分析

尝试编组键不是字符串的 Go 类型，JSON 格式不支持（JSON 对象键必须是字符串）。

English

Attempting to marshal a Go type with keys that are not strings, which JSON format does not support (JSON object keys must be strings).

generic

官方文档

https://pkg.go.dev/encoding/json#Marshal

解决方案

  1. Convert map keys to strings before marshaling: `newMap := make(map[string]string); for k, v := range oldMap { newMap[fmt.Sprintf("%d", k)] = v }`
  2. Define a custom struct or use a slice of key-value pairs instead: `type Entry struct { Key int; Value string }` then marshal `[]Entry`.

无效尝试

常见但无效的做法:

  1. 90% 失败

    MarshalIndent also calls json.Marshal internally; same error occurs.

  2. 60% 失败

    Returning nil causes json.Marshal to serialize the value as 'null', not skip it; error still may occur depending on implementation.