JAVASCRIPT

Persist State with useLocalStorage Hook

Create a `useLocalStorage` React hook to easily persist and retrieve component state in the browser's local storage, ensuring data survives page refreshes.

import { useState, useEffect } from 'react';

function useLocalStorage(key, initialValue) {
  const [value, setValue] = useState(() => {
    try {
      const item = window.localStorage.getItem(key);
      return item ? JSON.parse(item) : initialValue;
    } catch (error) {
      console.error(error);
      return initialValue;
    }
  });

  useEffect(() => {
    try {
      window.localStorage.setItem(key, JSON.stringify(value));
    } catch (error) {
      console.error(error);
    }
  }, [key, value]);

  return [value, setValue];
}

// Example Usage:
// function UserSettings() {
//   const [theme, setTheme] = useLocalStorage('appTheme', 'light');

//   return (
//     <div>
//       <p>Current theme: {theme}</p>
//       <button onClick={() => setTheme(theme === 'light' ? 'dark' : 'light')}>
//         Toggle Theme
//       </button>
//     </div>
//   );
// }

How it works: The `useLocalStorage` hook allows you to store and retrieve state directly from the browser's `localStorage`. It initializes its state by attempting to read from `localStorage` using the provided `key` and automatically updates `localStorage` whenever its state changes. This provides a simple way to persist data across page loads, enhancing user experience without manual handling of storage APIs.

Persist State with useLocalStorage Hook

Need help integrating this into your project?