Developers use localhost : 3000 to see the preview of the developed application and test it according to the requirements for responsiveness and other parameters before deploying it to production. @Whassad181 npm run dev I usually use node without npm on the machine. In the world of web development, localhost:3000 is a popular shorthand for localhost port 3000 , the default port used by many web servers. It is often used to Accidentally typed locallhost : 3000 instead of localhost : 3000 ? We'll help you redirect to the correct address and provide solutions for common development issues.
