React Diagnostic

Fix "Uncaught TypeError: setState is not a function" in React Context & Hooks

Triggered when attempting to call a state updater that was improperly destructured (using curly braces { } instead of square brackets [ ] with useState), or when Context Provider value is undefined.

Uncaught TypeError: setState is not a function

Quick Fix Checklist

  1. Always destructure useState with array brackets: const [count, setCount] = useState(0)
  2. Verify Context Provider provides value prop: <AuthContext.Provider value={{ user, setUser }}>
  3. Add guard in custom context hook: if (!context) throw new Error("Must be used within Provider")