useEffect(() => {
    const apiCall = async () => {
      const response = await axios.get(`http://localhost:5000/callback:id`);
      console.log(response);
    };
    apiCall();
  }, []);

app.get("/callback", cors(), (req, res) => {

  if (req.query.code !== null && req.query.code !== undefined) {
    var token_url = "https://www.ssoservice.kr/oauth2.0/token";
    var options = {
      url: token_url,
      method: "POST",
      form: {
        grant_type: "authorization_code",
        client_id: client_id,
        client_secret: client_secret,
        redirect_uri: redirectURI,
        code: req.query.code,
        state: req.query.state,
      },
    };

    request(options, function (error1, response1, body1) {
      if (!error1 && response1.statusCode == 200) {
        var tdata = JSON.parse(body1);
        var options2 = {
          url: "https://www.ssoservice/oauth2.0/resource",
          headers: {
            "Content-Type": "application/json",
            Authorization: "Bearer " + tdata.access_token,
          },
        };
        request(options2, function (error2, response2, body2) {
          if (!error2 && response2.statusCode == 200) {
            var rdata = JSON.parse(body2);
            res.writeHead(200, { "Content-Type": "text/json;charset=utf-8" });
            res.end(rdata);

            console.log(rdata); 
            ////////////////this data////////////
          } else {
            res.status(response2.statusCode).end();
            console.log("error2 = " + response2.statusCode);
          }
        });
      } else {
        res.status(response1.statusCode).end();
        console.log("error1 = " + response1.statusCode);
      }
    });
  }
});