Firebase Has a Free API That Goes Way Beyond Authentication

Firebase is Google's app platform, and most devs only scratch the surface with Auth and Firestore. Its JavaScript SDK exposes powerful APIs for real-time data, storage, ML, and more. Firestore Real-Time Listeners import { collection , query , where , onSnapshot , orderBy , limit } from " firebase/firestore " ; const q = query ( collection ( db , " scrapedProducts " ), where ( " price " , " < " , 50 ), orderBy ( " scrapedAt " , " desc " ), limit ( 100 ) ); const unsubscribe = onSnapshot ( q , ( snapshot ) => { snapshot . docChanges (). forEach (( change ) => { if ( change . type === " added " ) console . log ( " New product: " , change . doc . data ()); if ( change . type === " modified " ) console . log ( " Price changed: " , change . doc . data ()); if ( change . type === " removed " ) console . log ( " Removed: " , change . doc . id ); }); }); Real-time sync across all connected clients — zero WebSocket setup. Firestore Aggregation Queries import { getAggregateFromServer , collection