node.js - Why is the body of request empty? -

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i'm using pattern project sending json-data node. in other project works, in project not. req-object valide, body empty. why?

client-side:

json = { "auth_user_pkref": 2 }         json.test_id = "anca"         json.questions_count = 3         json.right_answers = 2         json.wrong_answers = 1         json.seconds_spent = 180          console.log('/api/answer/add', json);         $.ajax({             url: "/api/answer/add",             type: "post",             data: json.stringify(json),             contenttype: "application/json",             success: function (data) {              },             error: function (jqxhr, textstatus, errorthrown) {                 console.log("error, db error");             }         });

server-side:

router.post('/api/answer/add', function (req, res) {     console.log('/api/answer/add: ', req.body)

server-log:

/api/answer/add:  undefined 

    json = { "auth_user_pkref": 2 }     json.test_id = "anca"     json.questions_count = 3     json.right_answers = 2     json.wrong_answers = 1     json.seconds_spent = 180      console.log('/api/answer/add', json);     $.ajax({         url: "/api/answer/add",         type: "post",         data: json,         contenttype: "application/json",         success: function (data) {          },         error: function (jqxhr, textstatus, errorthrown) {             console.log("error, db error");         }     });

try this


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