nodejs调用百度统计api摆脱人肉数据统计

var http = require("https");
var url = require('url');

var postData = JSON.stringify(
{
    "header": {
        "account_type": "1",
        "password": "XXX",
        "token": "XXX",
        "username": "XXX"
    },
    "body": {
        "siteId": 11111,
        "method":"visit/toppage/a",
        "start_date":"20190227",
        "end_date": "20190227",
        "metrics": "pv_count,visitor_count",
        "gran":"day"
    }

});

var options = 
{
    hostname: url.parse("https://api.baidu.com").hostname,
    path:'/json/tongji/v1/ReportService/getData',
    port:443,
    method:"POST",

};

var req = http.request(options,function(res)
{
    res.setEncoding("utf-8");
    res.on("data",function(chunk){
        console.log("data: ");
        console.log(chunk.toString());
    });
    console.log(res.statusCode);
});

req.on("error",function(err){
    console.log(err.message);
});

req.write(postData);
req.end();

百度需要的是json数据