how to access deeply nested json keys and values

Question

I\'m writing a websocket client in Go. I\'m receiving the following JSON from the server:

{\"args\":[{\"time\":\"2013-05-21 16:57:17\"}],\"name\":\"send:time\"

Answer 1

You may like to consider the package github.com/bitly/go-simplejson

See the doc： http://godoc.org/github.com/bitly/go-simplejson

Example:

time, err := json.Get("args").GetIndex(0).String("time")
if err != nil {
    panic(err)
}
log.Println(time)

Answer 2

The interface{} part of the map[string]interface{} you decode into will match the type of that field. So in this case:

args.([]interface{})[0].(map[string]interface{})["time"].(string)

should return "2013-05-21 16:56:16"

However, if you know the structure of the JSON, you should try defining a struct that matches that structure and unmarshal into that. Ex:

type Time struct {
    Time time.Time      `json:"time"`
    Timezone []TZStruct `json:"tzs"` // obv. you need to define TZStruct as well
    Name string         `json:"name"`
}

type TimeResponse struct {
    Args []Time         `json:"args"`
}

var t TimeResponse
json.Unmarshal(msg, &t)

That may not be perfect, but should give you the idea