api.js - js applications

const host = "http://localhost:3030";

//universal function for requests:

async function request(url, options) {
  try {
    const response = await fetch(host + url, options);

    if (response.ok !== true) {
      if (response.status == 403) {
        sessionStorage.removeItem("userData"); // problem with registration!
      }

      const error = await response.json();
      throw new Error(error.message);
    }

    if (response.status == 204) {
      return response;
    } else {
      return response.json();
    }
  } catch (err) {
    alert(err.message);
    throw err;
  }
}

// function for creating request options:
function createOptions(method = "get", data) {
  const options = {
    method,
    headers: {},
  };

  if (data !== undefined) {
    options.headers["Content-Type"] = "application/json";
    options.body = JSON.stringify(data);
  }
  const userData = JSON.parse(sessionStorage.getItem("userData"));
  if (userData !== null) {
    options.headers["X-Authorization"] = userData.token;
  }

  return options;
}

export async function get(url) {
  return request(url, createOptions());
}

export async function post(url, data) {
  return request(url, createOptions("post", data));
}

export async function put(url, data) {
  return request(url, createOptions("put", data));
}

export async function del(url) {
  return request(url, createOptions("delete"));
}

export async function login(email, password) {
  const result = await post("/users/login", { email, password });
  const userData = {
    email: result.email,
    id: result._id,
    token: result.accessToken,
  };
  sessionStorage.setItem("userData", JSON.stringify(userData));
}

export async function register(email, password) {
  const result = await post("/users/register", { email, password });
  const userData = {
    email: result.email,
    id: result._id,
    token: result.accessToken,
  };
  sessionStorage.setItem("userData", JSON.stringify(userData));
}

export async function logout() {
  await get("/users/logout");
  sessionStorage.removeItem("userData");
}