Accidentally typed locallhost : 3000 instead of localhost : 3000 ? We'll help you redirect to the correct address and provide solutions for common development issues. 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. 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 talk about development environments and is often the first port that web apps use to run. Localhost:3000 is an important tool for both experienced and novice developers alike. It provides an easy way to setup and manage development environments, helping speed-up the development process and reduce the amount of time needed to get an ... This will start the React app on port 3001 instead of the default port 3000 . Using Environment Variables Alternatively, you can create a .env file in the root of your React project and add the line PORT=3001. This permanently sets the environment variable for your project; every time you run the npm start command, the app will listen on the specified port. What is running on localhost 3000 ? Identifying Localhost Services When something runs on localhost 3000 , it's typically a development ...
