How to check if a json key exists?

Question

So, I get some JSON values from the server but I don\'t know if there will be a particular field or not.

So like:

{ \"regatta_name\":\"ProbaRegatta\"         


        

Answer 1

just before read key check it like before read

JSONObject json_obj=new JSONObject(yourjsonstr);
if(!json_obj.isNull("club"))
{
  //it's contain value to be read operation
}
else
{
  //it's not contain key club or isnull so do this operation here
}

isNull function definition

Returns true if this object has no mapping for name or
if it has a mapping whose value is NULL. 

official documentation below link for isNull function

http://developer.android.com/reference/org/json/JSONObject.html#isNull(java.lang.String)