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Hot debate today:
Is the text stream null valid JSON?
According to http://www.ietf.org/rfc/rfc4627.txt?number=4627:
...
2. JSON GrammarA JSON text is a sequence of tokens. The set of tokens includes six structural characters, strings, numbers, and three literal names.
A JSON text is a serialized object or array.
Should this interpreted as both statements must be true in order for the text to be valid JSON?
However, many other libraries seem to permit it, and indeed, it seems like a single valid token could be a legitimate result.
Is there a definitive answer?
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When serializing to JSON, if a value of a property in the data object is null, then it will be serialized as a JSON null.
To check null in JavaScript, use triple equals operator(===) or Object is() method. If you want to use Object.is() method then you two arguments. 1) Pass your variable value with a null value. 2) The null value itself.
JSON has two types of null value In JSON there are effectively two types of null . When the key is provided, and the value is explicitly stated as null . When the key is not provided, and the value is implicitly null .
JSON has a NULL data type, but it has not a None data type. A dictionary in Python cannot have null as a value but can have “null” as a value that can be interpreted as a string.
RFC 7159 drops the limitation that a JSON text must be an object or an array. The grammar specifies:
JSON-text = ws value ws
where
value = false / null / true / object / array / number / string
Thus, "null" is now a valid JSON document.
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