Building a JSON object with an array as a value

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]"

Corvus Crypto · Accepted Answer · 2016-03-17 15:54:20Z

2

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 {
        //...
    }
}

answered Mar 17, 2016 at 15:54

Corvus Crypto

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Comments

Mitchell Ingram · Accepted Answer · 2016-03-17 16:17:09Z

-1

I was overthinking it. The answer was:

var jsonprep string = `{"extent":[-76.0624694824, 36.8856620774, -75.9800720215, 36.9449529607]}`

edited Mar 17, 2016 at 16:17

answered Mar 17, 2016 at 15:38

Mitchell Ingram

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2 Comments

Corvus Crypto Over a year ago

this isn't valid. Please wrap those numbers in square brackets ([]). Also, while you can statically write out the strings, you should look into using the encoding/json package for this stuff.

Mitchell Ingram Over a year ago

I was using it from r.PostFormValue("extent") so I just used those numbers as a stand in. In reality I used var jsonprep string = {"extent": + r.PostFormValue("extent") + }

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