Cached API call with expiry time

const key = `${URL}${JSON.stringify(config)}` is made like this const key = JSON.stringify(URL) + JSON.stringify(config) in the below code.

function CachedAPICall(delay) {
  const cache = {};

  return async (URL, config = {}) => {
    const key = JSON.stringify(URL) + JSON.stringify(config);
    const entry = cache[key];

    if (!entry || Date.now() > entry.expiry) {
      console.log("Making a fresh API URL call");
      try {
        const res = await fetch(URL, config);
        const data = await res.json();
        cache[key] = { value: data, expiry: Date.now() + delay };
      } catch (e) {
        console.log("Error in the API URL calling");
      }
    }
    return cache[key].value;
  };
}

const API = "https://jsonplaceholder.typicode.com/todos/1";
const cachedAPICall = CachedAPICall(1500);

cachedAPICall(API, {}).then((res) => console.log(1, res));

setTimeout(() => {
  cachedAPICall(API, {}).then((res) => console.log(2, res));
}, 700);

setTimeout(() => {
  cachedAPICall(API, {}).then((res) => console.log(3, res));
}, 2000);

// Making a fresh API URL call
// 1
// {
//   userId: 1,
//   id: 1,
//   title: "delectus aut autem",
//   completed: false,
// }

// 2
// {
//   userId: 1,
//   id: 1,
//   title: "delectus aut autem",
//   completed: false,
// }

// Making a fresh API URL call
// 3
// {
//   userId: 1,
//   id: 1,
//   title: "delectus aut autem",
//   completed: false,
// }