Issue in converting String to JSONArray/JSONObject

Question

I have to check whether the given value is JSONObject or not.... example input :

Object obj = "{} testing"

i am checking with below code:

public boolean isJSONValid(Object obj) {
 try {
   new JSONObject(obj);
 } catch(JSONException e) {
   return false;
 }
 return true;
}

but for above input it is giving true, am using org.json jar file.

I think this question is quite similar to this one: How to check if a string is a valid JSON string in JavaScript without using Try/Catch. You might use the regular expression suggested or also JSON.parse(str); alternative with try/catch — Marcio Jasinski
– Marcio Jasinski, Commented Oct 7, 2015 at 14:20

Community · Accepted Answer · 2017-05-23 12:29:35Z

1

To check if an object is a JSONObject use instanceof.

if(obj instanceof JSONObject){
  //your code here
}

You can test if a String is valid JSON using: How to check whether a given string is valid JSON in Java But I'm assuming you already found that, looking at the similar code.

EDIT

This function returns false when given obj = "{} testing";

public boolean isJSONObject(Object obj) {
    if(obj instanceof JSONObject){
        return true;
    }
    return false;
}

edited May 23, 2017 at 12:29

CommunityBot

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answered Oct 7, 2015 at 14:16

Daniël J

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1 Comment

Daniël J Over a year ago

I've added a piece of code that does in fact return the correct value for your problem using instanceof.

Community · Accepted Answer · 2017-05-23 11:58:25Z

0

Can you print the "new JSONOBJECT(obj)" to string after you create it? I would think it is using reflection to convert that standard object to a JSON object when you are passing it to the constructor. Reference the answer to this question. It shows how to check if an object is an instance of a JSONObject.

edited May 23, 2017 at 11:58

CommunityBot

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answered Oct 7, 2015 at 14:15

E_Denlinger

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