Null converts javascript to and from strings

Background: Today review a piece of code to lead to my question, the code is as follows:

 if (a === 'null') {
     //
 }
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Q: How do null and strings interconvert?

1. Null is converted to a string

let a = null + ' ';
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2. The ‘null’ string is converted to NULL

let a = JSON.parse('null'); // null
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