panic: json: unsupported type: map[interface {}]interface {}

[gqcn]

Package yaml uses map[interface {}]interface {} as the value of the map[string]interface {} when there's nested map. Its decoded result map is not supported by package json.

Example codes:

package main

import (
	"encoding/json"
	"fmt"
	"gopkg.in/yaml.v2"
)

func main() {
	data := []byte(`
m:
 k: v
    `)
	var result map[string]interface{}
	if err := yaml.Unmarshal(data, &result); err != nil {
		panic(err)
	}
	b, err := json.Marshal(result)
	if err != nil {
		panic(err)
	}
	fmt.Println(string(b))
}

Output:

panic: json: unsupported type: map[interface {}]interface {}

goroutine 1 [running]:
main.main()

[niemeyer]

Try v3 and it should work: https://play.golang.org/p/nprraynctEy

[gqcn]

@niemeyer Awesome, thanks!