How to Parse JSON with Dynamic Top-Level Keys in Go?

JSON Parsing with Dynamic Keys in Golang

In Golang, parsing a JSON string with a dynamic top-level key can be challenging. Consider the following JSON:

{"bvu62fu6dq": {
    "name": "john",
    "age": 23,
    .....
    .....}

To extract the values for "name" and "age," a custom solution is required as the top-level key is not a fixed field.

Using Go Structs and Maps

An optimal approach is to define a struct to represent the inner object and a map to represent the dynamic top-level key. The struct should include fields for the desired attributes, such as:

type Person struct {
    Name string `json:"name"`
    Age  int    `json:"age"`
}

The map, in turn, can use the dynamic top-level key as the key and the Person struct as the value. This structure allows for efficient access to the desired values:

type Info map[string]Person

Decoding and Extraction

To decode the JSON into the custom structs, use the json.Unmarshal function. Once decoded, the values can be accessed via the map key:

var info Info
json.Unmarshal([]byte(j), &info)
fmt.Printf("%s: %d\n", info["bvu62fu6dq"].Name, info["bvu62fu6dq"].Age)

This approach provides a flexible and extensible way of handling JSON with dynamic top-level keys, ensuring easy access to the desired attributes.

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