How to unmarshal json with unknown fields and keys

Question content

From the front end I got this json example:

{
  "properties":{"unknown key": "unknown value","unknown key2": "unknown value 2"}
}

I started parsing it with map[string]interface{} but it doesn't work. I also don’t know how much I can gain in this field. Can be 10 or 1.

Code:

type test struct {
    p map[string]string `json:"properties"`
}

func main() {
    var t test

    body := `
    {
        "properties":{"unknown key": "unknown value","unknown key2": "unknown value 2"}
    }
    `

    json.Unmarshal([]byte(body), &t)

    fmt.Println(t.p)
}

This code always returns an empty map.

Correct answer

You should export the structure fields that should be unmarshalled, for example:

type test struct {
    P map[string]string `json:"properties"`
}

Seehttps://www.php.cn/link/eaf76caaba574ebf8e825f321c14ba29

The above is the detailed content of How to unmarshal json with unknown fields and keys. For more information, please follow other related articles on the PHP Chinese website!