To run a React app in development mode, follow these steps:

1. Open a command prompt or terminal window.
2. Navigate to the root directory of your React app.
3. Type the following command and press Enter to start the development server:sql

1. npm start
2. Wait for the development server to start up and launch the app in your default web browser.
3. You can now make changes to the code in your app and the development server will automatically reload the app in your browser to reflect the changes.
4. To stop the development server, press Ctrl + C in the command prompt or terminal window.

Note: In development mode, the app may run slower due to extra debugging code and other development features. To optimize the app for production, you’ll need to build a production version of the app.

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