How Can I Handle Dynamic JSON Field Types in Go?

Handling Dynamic JSON Field Types in Go

Deserializing JSON into structured data in Go can be challenging when the type of a key's value keeps changing. For instance, an API may provide data in varying formats, such as:

{
  "mykey": [
    {obj1},
    {obj2}
  ]
}

{
  "mykey": [
    "/obj1/is/at/this/path",
    "/obj2/is/at/this/other/path"
  ]
}

Go's Approach

To handle such dynamic JSON, consider using a flexible data structure like the following:

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

This structure allows for both strings and objects to be stored in the MyKey slice.

Distinguishing Types

Once the JSON is deserialized, you can differentiate between strings and objects using a type switch:

for i, 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 approach enables you to determine the type of each element in the MyKey slice and process it accordingly.

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