How to Unmarshal JSON with a Dynamic Key in Go?

JSON Unmarshal with Dynamic Key

Unmarshalling JSON with a dynamic key that cannot be captured as a static field in a struct can be achieved in Go using a map.

Example:

Consider the following JSON data:

{
 "any string" : {
   "a_known_string" : "some value",
   "b_known_string" : "another value" 
 }
}

And the struct:

type X struct {
    A string `json:"a_known_string"`
    B string `json:"b_known_string"`
}

Solution:

To capture the dynamic key as well as the known values, use a map instead of a struct:

import "encoding/json"

var m map[string]X
err := json.Unmarshal([]byte(jsonStr), &m)
if err != nil {
    // Handle error
}

// Access the data using the dynamic key
dynamicKeyData := m["any string"]

In this scenario, the map[string]X type allows for the dynamic key "any string" to be captured along with the known values in the X struct.

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