无法解析req.body中的JSON

Question

使用node express，我无法在ajax帖子后解析req.body。身体通过，但似乎被包裹在另一个对象，防止解析。

profileController.client.js

{"polltitle":"tree","option1":"oak","option2":"willow"}

此时记录的stringifed有效负载看起来是正确的：

ajax: function ajaxByObj (req) {
  const url = req.url;
  const method = req.method || 'get';
  const successCallback = req.success;
  const errorCallback = req.error;
  const contentType = req.contentType || "application/x-www-form-urlencoded";
  const dataType = req.dataType || 'json';
  const payload = req.payload || ''; 
  console.log(payload)
  let xhr = new XMLHttpRequest();
  xhr.open(method, url)
  xhr.setRequestHeader("Content-type", contentType)
  xhr.responseType = dataType
  xhr.onload = function () {
     let _this = this
     if (this.status == 200) {
        successCallback(_this.response)
     } else {
        errorCallback(_this.response)
     }
  }
  xhr.send(payload)
}

ajaxFunctions.ajax

this.addNewPoll = function(req, res) {
   console.log('raw', req.body)
   var polldata = JSON.parse(req.body)
   console.log('parsed:', polldata)
   var title = polldata.polltitle
   console.log('title',title)
   var fields = []
   for (var prop in polldata) {
      if (prop != 'poll title') {            
        fields.push({"name": polldata[prop], "votes": 0})
      }
   }

以及快递

中路由器的请求处理程序

raw { '{"polltitle":"tree","option1":"oak","option2":"willow"}': '' }

记录的原始 req.body数据如下所示

SyntaxError: Unexpected token o

您可以看到数据包含在另一个空字符串值

的对象中

当我尝试JSON.parse这个数据时，它会抛出异常

{{1}}

请帮助我找出我做错了什么

谢谢！