Local Storage

Definitions

1. A browser API for storing key-value string data (up to ~5-10MB) that persists across sessions. Synchronous and blocks the main thread, so avoid storing large data. Not suitable for sensitive data (accessible to any script on the domain). Alternative: IndexedDB for larger/structured data, sessionStorage for session-scoped data.

   In plain English: A simple way for websites to save small amounts of data in your browser that sticks around even after you close the tab.

   Example: "Store the user's theme preference in localStorage — it persists across tabs and browser restarts."

Related Terms

• IndexedDB
• data lake
• Browser
• Cookie
• CSS
• Database
• DOM
• Shadow DOM
• Cookie Storage
• WebGL