How to Convert a Dynamic YAML String to JSON in Go?

Converting YAML to JSON without Predefined Data Structures

Question:

How do you convert a YAML string with a dynamic structure into a JSON string? Unmarshaling into an interface{} results in an unsupported data type (map[interface {}]interface {}).

Answer:

The challenge lies in the unanticipated depth of nested maps and slices when unmarshaling YAML into a generic interface{}. Here's an approach to recursively convert them into map[string]interface{} and []interface{}:

func convert(i interface{}) interface{} {
    switch x := i.(type) {
    case map[interface{}]interface{}:
        m2 := map[string]interface{}{}
        for k, v := range x {
            m2[k.(string)] = convert(v)
        }
        return m2
    case []interface{}:
        for i, v := range x {
            x[i] = convert(v)
        }
    }
    return i
}

Example usage:

var body interface{}
if err := yaml.Unmarshal([]byte(s), &body); err != nil {
    panic(err)
}

body = convert(body)

if b, err := json.Marshal(body); err != nil {
    panic(err)
} else {
    fmt.Printf("Output: %s\n", b)
}

Output:

{"Services":[{"Orders":[
    {"ID":"$save ID1","SupplierOrderCode":"$SupplierOrderCode"},
    {"ID":"$save ID2","SupplierOrderCode":111111}]}]}

Note: This conversion process may result in loss of element order, as Go maps are unordered.

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