How can I check if a value is a json object?

Question

My server side code returns a value which is a json object on success and a string \'false\' on failure. Now how can I check whether the returned value is a json object?

Answer 1

var data = 'json string ?';
var jdata = null;
try
{
    jdata = $.parseJSON(data);  
}catch(e)
{}

if(jdata)
{
//use jdata
}else
{
//use data
}