How to check if a json key exists?

JSONObject class has a method named "has":

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

Returns true if this object has a mapping for name. The mapping may be NULL.

You can check this way where 'HAS' - Returns true if this object has a mapping for name. The mapping may be NULL.

if (json.has("status")) {
   String status = json.getString("status"));
}

if (json.has("club")) {
   String club = json.getString("club"));
}

You can also check using 'isNull' - Returns true if this object has no mapping for name or if it has a mapping whose value is NULL.

if (!json.isNull("club"))
    String club = json.getString("club"));