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How to Prevent Methods from Being Called Twice in React


When working on a React application, you may encounter a common issue where a method is triggered twice unexpectedly. This can be caused by a number of factors, but one common cause is the use of the StrictMode.
StrictMode is a React feature that helps to catch potential errors in your code. However, it can also cause some methods to be called twice. This is because the StrictMode forces React to re-render components even when their state or props have not changed.

To fix this issue, you can disable the StrictMode by removing the </React.StrictMode> closing tag from your index.js file. This will prevent React from re-rendering components unnecessarily and will stop methods from being called twice.

Here are the steps on how to disable the StrictMode and fix a method being called twice in React:

  1. Open the index.js file in your React application.

  2. Locate the line that contains the </React.StrictMode>.


  3. Remove the </React.StrictMode> closing tag from the line.


  4. Save the file and see the changes.

Before removing the Strict Mode:


After removing the Strict Mode:


After following these steps, the method triggering issue should be resolved, and your method will be called only once as expected.

It is important to note that the issue of methods being triggered twice due to the StrictMode occurs only in the development mode. When you build and deploy your React application for production, the StrictMode is automatically disabled, ensuring that the problem will not affect your application.

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