json - Weird output coming from express' req.query -

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I am calling a AJAX to call server-side process of some nodes.

This is my data object 

  var data = {field1: value1, field2: value2}   
 And sending  data: Data to call using JSON.stringify (data)   
 In the path of my  node ,  Req.query  as follows:  
  {'{"field1": "7", "field2": "7"}': ''}   
 I can not get the values ​​using  req.query.field1 , how can I format this output so that I can move forward?   
 
 
 The problem is not being set properly from your request headings (Content Type: JSON), because You are sending a string.  
 To show your post that you are using jQuery, you do not need to empower your data, send it as JSON and jQuery, set the right title:  
  $ Ajax ({type: post}, url: "/ someurl", data: {field1: "7", field 2: "7"}}) done (function (msg) {warning ("data saved:" + msg );});

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