将嵌套的json对象转换为formdata javascript for Multer

function nestedJsonToFormData(json, formData = new FormData(), parentKey = '') {
    for (let key in json) {
        if (json.hasOwnProperty(key)) {
            const value = json[key];
            const newKey = parentKey ? `${parentKey}[${key}]` : key;

            if (typeof value === 'object' && !(value instanceof File)) {
                nestedJsonToFormData(value, formData, newKey);
            } else {
                formData.append(newKey, value);
            }
        }
    }
    return formData;
}

// 示例使用
const nestedJson = {
    name: 'John Doe',
    address: {
        street: '123 Main St',
        city: 'Anytown',
        zip: '12345'
    },
    files: [/* File objects here */]
};

const formData = nestedJsonToFormData(nestedJson);

// 现在你可以将formData传递给Multer或其他需要FormData的API