package org.json does not exist when importing org.json.JSONObject
In my case i was using maven build tool and got this error so had to add below dependency from here like below and error resolved.
<dependency>
<groupId>org.json</groupId>
<artifactId>json</artifactId>
<version>20180130</version>
</dependency>
Class org.json.JSONObject is available in json-20131018.jar. You need to download this jar and add this jar to your buildpath.
In order to add external jar to buildpath you can - right click on your project in eclipse - click build path -> configure build path - goto tab libraries - there you will find to add external JAR
This will allow you to include any external jar into your build path.