App.js

import { useState, useEffect } from "react";

import axios from "axios";

function App() {
  const [dataXML, setdata] = useState({});

  const getData = async () => {
    try {
      const response = await axios.get(
        "http://api.nbp.pl/api/exchangerates/tables/a",

        {
          "Content-Type": "application/xml; charset=utf-8",
        }
      );

      setdata(response.data[0]);
    } catch (error) {
      console.log(error);
    }
  };

  useEffect(() => {
    getData();
  }, []);

  console.log(dataXML);

  return (
    <div>
      <h1>{dataXML.effectiveDate}</h1>

      <h2>{dataXML.no}</h2>
    </div>
  );
}

export default App;