What is the reason behind JSON.parse returning null when the parameter is null?

When null is passed to JSON.parse, it returns null without any explanation in the documentation. Is there a specific reason for this behavior?

Some other things to consider:

  • This might be related to type conversion, as even passing JSON.parse("null") results in null. However, is this detail explicitly stated anywhere?

Answer №1

The reason for this behavior is attributed to the specifications of JSON.parse(text\[,receiver\]), where:

  • Let jsonString be ? ToString(text).

Essentially, the text is first converted to a string (null -> "null") before being passed to the internal JSON parser.

Subsequently, the JSON.parse function processes not only full JSON structures, but also individual values like number, string, and null.

Hence, when parsing null, it is recognized as the actual null value and returned in its original form.

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