React · Theory

React DevTools

Theory

75/94

React DevTools

React Developer Tools (browser extension) shows the component tree, props, hooks state, and a profiler for why something re-rendered. Faster than sprinkling console.log. Components tab for values, Profiler for performance.

React DevTools — output — three uses. Faster than console.log on every render.

Exam tip

Two tabs: Components + Profiler.

Example

// DevTools
console.log("install React Developer Tools");
console.log("Components tab → pick Hello → see props/hooks");
console.log("Profiler → what re-rendered");

React DevTools — output: three uses. Faster than console.log on every render.

Short notes

Components : props + hooks.
Profiler : re-renders.
Uselocalhost too.

React · Theory

React DevTools

← All stacks

Theory

75/94

React DevTools

React DevTools — output — three uses. Faster than console.log on every render.

Exam tip

Two tabs: Components + Profiler.

Example

// DevTools
console.log("install React Developer Tools");
console.log("Components tab → pick Hello → see props/hooks");
console.log("Profiler → what re-rendered");

React DevTools — output: three uses. Faster than console.log on every render.

Short notes

Components : props + hooks.
Profiler : re-renders.
Uselocalhost too.

React DevTools

Example

Short notes

Questions

React DevTools

Example

Short notes

Questions