Checking both typeof and instanceof feels like good advice if your code may be called by others'. In such cases cloning or serializing objects is the way to go: since we logged duplicated object, even when AJAX finishes its work, it will fill "old" data. JavaScript calls the toString method to convert an object to a primitive value. awhie29urh2 Jun 20, 2013 at 19:46 Property accessors provide access to an object's properties by using the dot notation or the bracket notation. The operation object MUST contain a "from" member, which is a string containing a JSON Pointer value that references the location Stringifying the userPropertiesAsJsonString variable twice will allow you to escape the JSON string (solution obtained from this answer; refer to this gist for a more detailed explanation) which will then allow you to obtain a request body that looks like the one in the answer provided by sanatsathyan. Serialize the entire object to a string and prefix it with a type tag. There is a naive way to copy objects: its looping through the original one copying every JavaScript is designed on a simple object-based paradigm. For most languages, this will return the same as toUpperCase(). Thank you. 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