How to use 'javascript json decode' in JavaScript

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function decode(json) {
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  return JSON.parse(json);
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}

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static decode(obj: any) {
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  if (obj && obj.$type === 'ObjectId') {
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    return new MongoDb.ObjectID(obj.$value);
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  }
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  if (obj && obj.$type === "Date") {
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    return new Date(obj.$value);
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  }
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  if (obj && obj.$type === "RegExp") {
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    return new RegExp(obj.$value.$pattern, obj.$value.$flags);
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  }
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  if (Array.isArray(obj)) {
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    return [...obj.map(JsonEncoder.decode)];
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  }
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  if (obj && typeof obj === 'object') {
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    for (const [key, value] of Object.entries(obj)) {
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      obj[key] = JsonEncoder.decode(value);
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    }
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  }
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  return obj;
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}