Checking a key is array or string in JSONObject

Question

I have a JSONObject

{"notes":{
"remarks":["abc","xyz"],
"factory notes":["abc","xyz"],
"name":"jdfb"
}
}

** i want to insert it to a table as remarks as a string factory notes as a string and name is already a string. but when i iterate this how do i know if it is array or string. whats the condition for that?

for name i could do obj.getString("name"), and for array its getJsonarray. if i can distinguish that i could easily convert it to string and inset to the table.**

String description=null;
                 Iterator<String> notesIterator = notesObj.keys();

                 while (notesIterator.hasNext()) {
                     String notesKey = notesIterator.next();
                     Object notesItrObj=notesIterator.next();
                 
                   
                     if(notesItrObj instanceof String ) {
                         description=notesObj.getString(notesKey);

                     }
                     else {

                      
                         JSONArray
notesArray=notesObj.getJSONArray(notesKey);
                       
                         description=notesArray.toString();
              

      


                 }

how come? I used `Array.isArray(a["notes"]["factory notes"])` and it return true, `Array.isArray(a["notes"]["name"])` return false which mean it's string — Doan Van Thang, Feb 12 '21 at 05:09
i have a jsonObject when i iterate it i get the key remarks . because i also need the key to insert to table. all i want is to check if the value of key is an array or not — Kevin, Feb 12 '21 at 05:13
Then you could try stringify then regex to check if it's valid json or not https://stackoverflow.com/a/3710506/10400870 — Doan Van Thang, Feb 12 '21 at 05:17
no..no.. that is not my question. the json is valid. i want to stringify it only if it is an array. so how do i check if its an array? — Kevin, Feb 12 '21 at 05:20
I already told you, if you need to check if it's array or not, use `Array.isArray(your_variable)` — Doan Van Thang, Feb 12 '21 at 05:23
@DoanVanThang This question appears to be about Java, not JavaScript. — Brian McCutchon, Feb 12 '21 at 05:51
Why not? Please clarify your problem and explain why that solution doesn't work. Otherwise, it's hard for us to help you. — Brian McCutchon, Feb 12 '21 at 06:01
ok..I am iterating the jsonObject and i get all 3 keys. say the first key is remarks. which is an array. so i ve to stringify that.if it is name i dont need to stringify it. so my quesion is how do check that? i dont know how to explain any more than this — Kevin, Feb 12 '21 at 06:12
You mean you want to check the key instead of the value? That wasn't clear from the question. Can you share your code so far? — Brian McCutchon, Feb 12 '21 at 06:22
no. i want to check the value of the key . ive added my code — Kevin, Feb 12 '21 at 06:32

score 0 · Accepted Answer · answered Feb 12 '21 at 07:18

0

The mistake in your code is here:

Object notesItrObj=notesIterator.next();

This should be:

Object notesItrObj=notesObj.get(notesKey);

This is because notesIterator.next() returns a key, not a value.

answered Feb 12 '21 at 07:18

Brian McCutchon

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Checking a key is array or string in JSONObject

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