"TanStack DB flips this model: it's a reactive, client-side database with local-first sync, offline support, and optimistic UX that updates instantly, no waiting for server responses. Unlike TanStack Query (great for server state), Convex (which ties you to its backend), or traditional state management, TanStack DB lets you think in terms of data and queries. You get SQL-like syntax, reactive live queries, and automatic optimistic mutations, all with minimal code."
"Traditionally, managing reactive client state in React looked something like this: import React, { useState, useEffect } from 'react'; function TaskList() { const [tasks, setTasks] = useState([]); const [loading, setLoading] = useState(true); const [error, setError] = useState(null); useEffect(() => { const fetchTasks = async () => { try { const response = await fetch('/api/tasks'); if (!response.ok) { throw new Error('Failed to fetch tasks'); } const data = await response.json(); setTasks(data); } catch (e) { setError(e); } finally {"
TanStack DB is a reactive, client-side database offering local-first sync, offline support, and optimistic UX that updates instantly without waiting for server responses. The system emphasizes thinking in terms of data and queries rather than traditional state containers, providing SQL-like syntax, reactive live queries, and automatic optimistic mutations. TanStack DB contrasts with tools that focus on server state or tie you to a specific backend by enabling rich client-side data modeling and sync. A task management example demonstrates reactive state, optimistic updates, and offline-ready user experiences. Required environment: Node.js v18+, React v18+ with TypeScript.
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