Other ways of decoding numbers

When decoded into an interface{}, JSON numbers are converted to float64. This is not always the desired result. You can use json.Number instead.

How to do it...

Use json.Decoder with UseNumber:

var output interface{}
decoder:=json.NewDecoder(strings.NewReader(`[1.1,2,3,4.4]`))
// Tell the decoder to use json.Number instead of float64
decoder.UseNumber()
err:=decoder.Decode(&output)
// [1.1 2 3 4.4]

Every element of output in the preceding example is an instance of json.Number. You can translate it to an int, float64, or big.Int as necessary.