javascript - 如何在 Node 中检查 req.body 是否为空，express？

Question

下面是我的请求正文，它是从客户端发送的

var  credentials = {

"ConsumerData": {

            "ConsumerStoreId": "a",
            "ConsumerUserId": "a"
        },
        "CustomerData": {

            "CustomerId": "2345678890"
        },
        "ErnD": {
            "UID": "3",
            "TxnDt": "1"
        },

        "PurD": [{
                "ItemCode": "3456tghw3",
                "ItemEANCode": "223222122"

            },
            {
                "ItemCode": "8jghw3865",
                "ItemEANCode": "3334443222"

            }
        ]
}

为了测试，我正在发送 var credentials = {} empty credentials

在服务器端 Controller (node，express)中，我想检查 req.body 是否为空

if(!req.body)

{
 console.log('Object missing');
}
if(!req.body.ConsumerData.ConsumerStoreId)
  {
  console.log('ConsumerStoreId missing');
  }
 if(!req.body.CustomerData.CustomerId)
  {
  console.log('CustomerId missing');
  }
  if(!req.body.ErnD.UID)
  {
  console.log('UID missing');
  }
    console.log('outside'); 

我正在检查所有内容，但总是只在外面打印

Answer 1

ES2015:

if(req.body.constructor === Object && Object.keys(req.body).length === 0) {
  console.log('Object missing');
}

ES2015 之前:

function isEmpty(obj) {
    for(var prop in obj) {
        if(obj.hasOwnProperty(prop))
            return false;
    }
    return JSON.stringify(obj) === JSON.stringify({});
}

if(isEmpty(req.body)) {
    console.log('Object missing');
}

有关 pre es2015 风格的更多方式:https://coderwall.com/p/_g3x9q/how-to-check-if-javascript-object-is-empty