how to check json key(object) is exist?

Question

I want to put validation for check key is exist or not.

{
 "id":"ProbaRegatta",
 "name":"Congo",
 "email":"invited"
 }

And sometimes, there will be an extra field like:

  {
   "id":"ProbaRegatta",
   "name":"Congo",
   "email":"invited"
   "contact":"xxxx"
   }

so i would to check 'contact' key exist

score 1 · Answer 1 · answered Feb 01 '17 at 11:15

1

JSONObject obj = new JSONObject(response.toString());
boolean check = obj.has("name");

answered Feb 01 '17 at 11:15

Sohail Zahid

8,099
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Please try to add details about the answer as possible - From Review – W4R10CK Feb 01 '17 at 11:19
thanks , its work in my project... – Divyesh Rudani Feb 01 '17 at 11:22
you are welcome @Divyesh – Sohail Zahid Feb 01 '17 at 11:24

score 1 · Answer 2 · edited Feb 01 '17 at 11:19

1

Take a look in below code

/**
 * Check the Existance of Given String in given JSONObject
 */

public static boolean hasData(JSONObject jsonObject, String string) {
    return jsonObject.has(string) && !jsonObject.isNull(string);
}`

edited Feb 01 '17 at 11:19

W4R10CK

5,502
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answered Feb 01 '17 at 11:15

Tarun Dholakiya

829
1
10
16

score 1 · Answer 3 · edited Feb 01 '17 at 11:20

1

Try this method jsonObject.has("key") for checking key is exit or not, and jsonObject.isNull("key") for null value.

edited Feb 01 '17 at 11:20

W4R10CK

5,502
2
19
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answered Feb 01 '17 at 11:16

Shijil

2,226
18
33

how to check json key(object) is exist?

3 Answers3