why does JSON.stringify() \u30FC to ー

i tried below code:

console.log(JSON.stringify({ test: "\u30FCabc" }));

it gives below ouput

'{"test":"ーabc"}'

we know that mainly JSON.stringify() method converts a JavaScript object or value to a JSON string. And as per JSON std (https://www.json.org/json-en.html) we should be able to store \u30FC. Then why "\u30FC" is converted to "ー" ?

>Solution :

Then why "\u30FC" is converted to "ー" ?

1. The JavaScript engine reads your string literal and does that conversion to create the in-memory string
2. The object containing that string is passed to JSON.stringify
3. JSON.stringify encodes the object as JSON and represents the ー as a literal ー because JSON.stringify was written in such a way to prefer literal characters over escape sequences where the JSON data format allows either.