doubleValue

fun JsonElement.doubleValue(vararg keys: String): Double

Navigates to the nested element at keys and returns its double value. Extension function on JsonElement.

Returns the double value of this JsonElement's primitive content. Extension property on JsonElement.

The content, quoted or not, must follow JSON number syntax or be NaN, Infinity or -Infinity, so every platform gives the same answer.

if this element is JSON null, not a primitive, or not a number