Which command starts the development server?

Which command starts the development server?

• A. npm start
• B. npm run eject
• C. npm run build
• D. npm test

Answer: (A)

Starting the development server is done by the start script in your project’s package.json. In most React setups (like Create React App), npm start runs the command that launches the development server (usually something like react-scripts start). This server serves your app locally and enables features like hot reloading, so you can see changes as you edit files without manually rebuilding. That’s why it’s the best answer: npm start is the standard, convenient way to spin up the dev server for local development. Other commands serve different purposes—eject switches away from the managed setup, build creates a production bundle, and test runs the test suite. You’ll typically access the app at http://localhost:3000 when the dev server is running.

Starting the development server is done by the start script in your project’s package.json. In most React setups (like Create React App), npm start runs the command that launches the development server (usually something like react-scripts start). This server serves your app locally and enables features like hot reloading, so you can see changes as you edit files without manually rebuilding.

That’s why it’s the best answer: npm start is the standard, convenient way to spin up the dev server for local development. Other commands serve different purposes—eject switches away from the managed setup, build creates a production bundle, and test runs the test suite. You’ll typically access the app at http://localhost:3000 when the dev server is running.