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POCan't parse JSON property "null"
 

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    <p>I faced with one trouble when tried to parse JSON "null" property, please help me to understand what's the real problem. I had a following JSON:</p> <pre><code>{ "properties" : { "null" : { "value" : false } } } </code></pre> <p>I used <a href="http://jsonlint.com" rel="nofollow">http://jsonlint.com</a> to validate that this JSON is valid. I tried to parse it from java:</p> <pre><code>import net.sf.json.JSONObject; import java.io.IOException; public class Test { public static void main(String[] args) throws IOException { String st = "{" + " 'properties' : {" + " 'null' : {" + " 'value' : false" + " }" + " }" + "}"; JSONObject.fromObject(st); } } </code></pre> <p>But got the exception:</p> <pre><code>Exception in thread "main" java.lang.ClassCastException: JSON keys must be strings. at net.sf.json.JSONObject._fromJSONObject(JSONObject.java:927) at net.sf.json.JSONObject.fromObject(JSONObject.java:155) at net.sf.json.JSONSerializer.toJSON(JSONSerializer.java:108) at net.sf.json.AbstractJSON._processValue(AbstractJSON.java:238) at net.sf.json.JSONObject._processValue(JSONObject.java:2655) at net.sf.json.JSONObject.processValue(JSONObject.java:2721) at net.sf.json.JSONObject.element(JSONObject.java:1786) at net.sf.json.JSONObject._fromJSONTokener(JSONObject.java:1036) at net.sf.json.JSONObject._fromString(JSONObject.java:1201) at net.sf.json.JSONObject.fromObject(JSONObject.java:165) at net.sf.json.JSONObject.fromObject(JSONObject.java:134) </code></pre> <p>I used json-lib-2.4-jdk15.jar from <a href="http://json-lib.sourceforge.net" rel="nofollow">http://json-lib.sourceforge.net</a> to parse it. Could anybody please clarify this? Why this library throws exception, but online validator said that it's valid JSON? It is a bug in the library or I made something wrong?</p>
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    1. COThis isn't the cause of the problem, but `null` is a keyword in JavaScript. Do you really need to use it as the name of your property?
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    2. CO@aroth 1) JSON is not JavaScript -- it is a formalized subset of JavaScript literals where object key are required to be surrounding in double-quotes 2) `"null"` is not `null`
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    3. CO@pst - JSON is not JavaScript, but often you end up working with it in JavaScript (not that this won't work in JavaScript, but it certainly makes for some [confusing looking code](http://jsfiddle.net/SZSm6/)). And `null` is also a keyword in Java. That `"null"` is not `null` is immaterial. It is still semantically vague to call a property `"null"` in my opinion.
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