How to Efficiently Convert YAML to JSON with Dynamic Data and No Structs?

YAML to JSON Conversion for Dynamic Data without Structs

When dealing with dynamic data that cannot be mapped to a struct, converting YAML to JSON can pose challenges. Consider the following YAML string:

Services: 
-   Orders: 
    -   ID: $save ID1
        SupplierOrderCode: $SupplierOrderCode
    -   ID: $save ID2
        SupplierOrderCode: 111111

To convert this YAML string to JSON, one approach is to unmarshal it into an interface{} type. However, this results in unsupported types, as the default type used to unmarshal key-value pairs is map[interface{}]interface{}.

To overcome this issue, we need to convert the map[interface{}]interface{} values to map[string]interface{} values recursively. Here's a function that performs this conversion:

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
}

Using this function, we can convert the YAML string to JSON as follows:

import (
    "encoding/json"
    "fmt"
    "github.com/go-yaml/yaml"
)

const s = `Services:
-   Orders:
    -   ID: $save ID1
        SupplierOrderCode: $SupplierOrderCode
    -   ID: $save ID2
        SupplierOrderCode: 111111
`

func main() {
    fmt.Printf("Input: %s\n", s)
    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:

Input: Services:
-   Orders:
    -   ID: $save ID1
        SupplierOrderCode: $SupplierOrderCode
    -   ID: $save ID2
        SupplierOrderCode: 111111

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

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