Slightly less code (still un-golfed as that does not appear to be the
stated requirement described at OP) using the same/similar pattern.
let input_json_string = `{"z":null}`;
const convertJSONNullToUndefined = json => {
const o = JSON.parse(json);
for (const key in o) if (o[key] === null) o[key] = void 0;
return o
}
convertJSONNullToUndefined(input_json_string); // do destructuring stuff
```
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