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class User { constructor(name, password) { this.name = name; this.password = password; } toJSON() { // Return only safe properties return { name: this.name }; } } const user = new User("Alice", "secret"); JSON.stringify(user); // {"name":"Alice"} — password excluded // Date has a built-in toJSON() new Date().toJSON(); // "2024-06-15T10:30:00.000Z"
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