React's useEffect hook

Wed, 18 Mar 2026 23:53:55 +0200

React’s useEffect hook is a powerful tool for managing side effects in functional components. It allows you to perform tasks like data fetching, subscriptions, or manual DOM manipulations after the component has rendered.

Basic Syntax

The useEffect hook accepts two arguments: a function for the effect and an optional array of dependencies.

useEffect(() => {
 // Side effect logic goes here
}, [dependencies]);

Dependency Behaviors

The way useEffect triggers depends on the dependency array provided:

Web Dev on Omar Shabana

React's useEffect hook

Basic Syntax

Dependency Behaviors