使用数组作为值构建JSON对象

Question

I need to send an Array inside a JSON object with the structure:

{"extent":[-76.0624694824, 36.8856620774, -75.9800720215,36.9449529607]}

How would I do this? I can't use the typical:

var jsonprep string = `{"extent":` + []float32{-76.0624694824, 36.8856620774, -75.9800720215, 36.9449529607} + `}`
var jsonStr = []byte(jsonprep)

because of the type mismatch. I am trying to send this to a server that expects it to be an array as I get the error,

The request content was malformed:
Expected List as JsArray, but got "[-76.0624694824, 36.8856620774, -75.9800720215,36.9449529607]"

Answer 1

If you are expecting that the array will change at some point, consider using the encoding/json package

Then you can create a struct prototype of your JSON object, then use json.Marshal() to serialize it into a []byte representation of the JSON object for transfer (whether by stdio, tcp, whatever).

e.g.

type ExampleJSON struct {
    Extent []float32 `json:"extent"`
}

func main(){
    var ex := &ExampleJSON{
        []float32{-76.0624694824, 36.8856620774, -75.9800720215, 36.9449529607}
    }
    jsonBytes, err := json.Marshal(ex)
    if err != nil {
        //...
    }
}