LocalStorage vs IndexedDB: JavaScript Guide (Storage, Limits & Best Practices)

Web applications use two main client-side storage options: LocalStorage and IndexedDB. LocalStorage is a simple key-value system for small amounts of data, limited to about 5MB per origin and storing only strings. It's suitable for basic app settings or preferences. IndexedDB is a more robust, asynchronous database for larger datasets, supporting objects, transactions, and indexing. It has a much larger capacity, making it ideal for offline functionality and file storage. For most modern web apps, IndexedDB is preferred due to its scalability and performance.