Fix React 'Maximum update depth exceeded' in useEffect Loops
Break circular state dependency loops in useEffect and custom hooks.
Maximum update depth exceeded. This can happen when a component repeatedly calls setState inside componentWillUpdate or componentDidUpdate.
import { useEffect, useMemo } from "react";
// Option 1: Depend directly on primitive string/number:
useEffect(() => {
fetchData(userId);
}, [userId]);
// Option 2: Wrap objects in useMemo if required by sub-functions:
const options = useMemo(() => ({ id: userId }), [userId]);Root Cause & Mechanism Analysis
Why does this error occur?
A `useEffect` hook triggers a state update, and that updated state or an unstable object reference is listed in the dependency array, causing the effect to run repeatedly forever.
Frequently Asked Questions
Why do object dependencies cause re-render loops in React?
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