const config = {
  method: "POST",
  body: {username: "user", password: "password"}
};
console.log(body, "<= body we sent", config, "<=config");

fetch(`http://localhost:8080/api/v1/esrap/login`,
config).then(function(response) {
    console.log(response, "response");
    return response.json();
}).then(function(data) {
    console.log("data=>", data);
})