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HTML/CSSAdvanced#storage#pwa
HTML/CSSAdvanced#storage#javascript
What is IndexedDB used for?
A low-level, transactional, client-side database in the browser for storing large amounts of structured data (including files/blobs), supporting indexes and queries, unlike the simple key-value storage of localStorage.
Example
const request = indexedDB.open('MyDB', 1);
request.onupgradeneeded = (e) => {
const db = e.target.result;
db.createObjectStore('notes', { keyPath: 'id' });
};