# localStorage without the footguns
URL: https://wwadd.dev/moves/javascript/localstorage

localStorage stores strings only, is synchronous, and throws in private mode or when full. Wrap reads in try/catch and never touch it during server rendering.


```javascript
function readJSON(key, fallback) {
  try {
    const raw = localStorage.getItem(key);
    return raw ? JSON.parse(raw) : fallback;
  } catch {
    return fallback;
  }
}

function writeJSON(key, value) {
  try {
    localStorage.setItem(key, JSON.stringify(value));
  } catch {
    /* quota exceeded or blocked */
  }
}
```

## Related Moves
- [Array methods you reach for](https://wwadd.dev/moves/javascript/array-methods)