将json首字母大写化js

function capitalizeFirstLetter(str) {
  return str.charAt(0).toUpperCase() + str.slice(1);
}

function capitalizeKeys(obj) {
  if (typeof obj !== 'object' || obj === null) {
    return obj;
  }

  if (Array.isArray(obj)) {
    return obj.map(item => capitalizeKeys(item));
  }

  const newObj = {};
  for (const key in obj) {
    if (obj.hasOwnProperty(key)) {
      const newKey = capitalizeFirstLetter(key);
      newObj[newKey] = capitalizeKeys(obj[key]);
    }
  }
  return newObj;
}

// 示例用法
const jsonObj = {
  name: "John",
  age: 30,
  address: {
    street: "123 Main St",
    city: "Anytown"
  },
  hobbies: ["reading", "traveling"]
};

const capitalizedJson = capitalizeKeys(jsonObj);
console.log(capitalizedJson);