Parsing JSON value fields is array or not. ( Javascript)

Question

JSON object reply from server with typical [reply] from a serialize function of input form with submit button. If not array then i would have only one value to check.

{
  101:["true","false"],
  102:["true","false"],
  103:"true",
  104:"false",
  105:["true","false"]

}

I know how to parse JSON with values with name/values pairs. But question is how to check if particular name value is array or not ?

Any suggestion/solution is welcome.