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Is My React Component Rendering Twice Because of Strict Mode?

Linda Hamilton
Release: 2024-12-28 13:42:11
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Is My React Component Rendering Twice Because of Strict Mode?

React Component Rendering Twice: Strict Mode Issue

Debugging your React application, you may encounter a scenario where a specific component is rendering twice. By examining the code, you stumble upon the following snippet:

if (workInProgress.mode & StrictMode) {
  instance.render();
}
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from "react-dom.development.js." This leads to the question: is this double rendering related to Strict Mode?

Understanding Strict Mode

Strict Mode is a built-in feature in React that aims to detect and report potential issues in your code. It enables extra checks and warnings that aid in identifying common mistakes and performance problems that might otherwise go unnoticed.

Role of Strict Mode in Double Rendering

During development, Strict Mode acts as a debugging tool and purposefully renders components twice. This double rendering helps identify and flag potential errors that might occur when a component's props or state change. It allows you to correct these issues before deploying the application to production.

Disabling Strict Mode

In production environments, however, double rendering is unnecessary. If you don't intend to use Strict Mode's debugging benefits, you can disable it.

One way to disable Strict Mode is to ensure that is not wrapping your application in your index.js file:

// Enabled Strict Mode
ReactDOM.render(
  <React.StrictMode>
    {app}
  </React.StrictMode>,
  document.getElementById('root')
);

// Disabled Strict Mode
ReactDOM.render(
  app,
  document.getElementById('root')
);
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By removing the tag, you disable this debugging behavior, and your components will render only once in production.

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