Are values "ok", false, true, null, 123 valid JSON <p>Are following strings a valid JSON?</p> <p><code>"ok"</code></p> <p><code>false</code></p> <p><code>true</code></p> <p><code>null</code></p> <p><code>123</code></p> <p>If not why do standard javascript <code>JSON.parse</code> method allow to use this values as valid JSON?</p> <p>I sometimes use this values when implementing JSON REST APIs, and faced with that objective-c frameworks doesn't parse this values.</p>