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const user = { name: "Alice", age: 30, active: true }; JSON.stringify(user); // {"name":"Alice","age":30,"active":true} // Pretty-print with 2-space indent JSON.stringify(user, null, 2); // { // "name": "Alice", // "age": 30, // "active": true // } // Filter: only include specific keys JSON.stringify(user, ["name", "age"]); // {"name":"Alice","age":30}
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