var myHeaders = new Headers();
myHeaders.append("User-Agent", "Apifox/1.0.0 (https://apifox.com)");
myHeaders.append("Content-Type", "multipart/form-data");
myHeaders.append("Accept", "*/*");
myHeaders.append("Host", "127.0.0.1:8181");
myHeaders.append("Connection", "keep-alive");

var formdata = new FormData();
formdata.append("data", "{\"ew\": {\"type\": [\"code\":\"123456\"]}}");

var requestOptions = {
    method: 'POST',
    headers: myHeaders,
    body: formdata,
    redirect: 'follow'
};

fetch("http://127.0.0.1:8181/", requestOptions)
    .then(response => response.text())
    .then(result => console.log(result))
    .catch(error => console.log('error', error));