How to Unmarshal JSON with Variable Array Field Types in Go?

Unmarshalling JSON with a Variable Array Field Type in Go

In Go, JSON data is unmarshalled into a predefined struct. However, certain API responses can present challenges when the type of a key's value can vary between requests. For instance, an API might return either inline objects or object references for a specific key.

To handle this variability, consider using the following approach:

type Data struct {
    MyKey []interface{} `json:"mykey"`
}

This structure unmarshals both inline objects and object references into an array of interfaces. By using a type switch after unmarshalling, you can determine the actual type of each element in the array:

for _, v := range data.MyKey {
    switch x := v.(type) {
    case string:
        fmt.Println("Got a string: ", x)
    case map[string]interface{}:
        fmt.Printf("Got an object: %#v\n", x)
    }
}

This method allows you to parse JSON data with variable array field types in a flexible and idiomatic manner.

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