从woomerce负载中提取对象并从字符串中移除反斜杠

我试图访问AWS Lambda中woomerce webhook负载中的对象(tmp_name)。此时,我可以输出“行项目”,其中:

exports.handler = (event, context, callback, err) => {
    callback(null, event.line_items);
    if (err) console.log('JSON Pass Fail');  // an error occurred
    else     console.log(event.order_key); // successful response
};

当我试图深入到事件数据时,它会以null的形式运行,例如

callback(null,event.line_items.meta_data.value.tmp_name);

我也试过用0和[0]访问数组,但没有任何乐趣。

最后,如果我可以访问文件路径,我需要去掉后拉,使它看起来像一个正确的文件路径。我已经拿到了 string.replace(/\\\//g, "/");

有人能帮我把这个拼起来吗?

{
"line_items": [
    {
    "id": 2,
    "name": "Audio 5",
    "product_id": 15,
    "variation_id": 0,
    "quantity": 1,
    "tax_class": "",
    "subtotal": "10.00",
    "subtotal_tax": "0.00",
    "total": "10.00",
    "total_tax": "0.00",
    "taxes": [

    ],
    "meta_data": [
        {
        "id": 20,
        "key": "_wcj_product_input_fields_global_1",
        "value": {
            "name": "Aaron Ramsey's departure from Arsenal to Juventus.mp3",
            "type": "audio\/mp3",
            "tmp_name": "\/home\/site\/public_html\/wp-content\/uploads\/woocommerce_uploads\/wcj_uploads\/input_fields_uploads\/21.mp3",
            "error": 0,
            "size": 4943085,
            "wcj_type": "file"
        }
        }
    ],
    "sku": "",
    "price": 10
    }
],
"tax_lines": [

],
"shipping_lines": [

],
"fee_lines": [

],
"coupon_lines": [

],
"refunds": [

]
}