To change the port on a Next.js

To change the port on a Next.js application, you can specify the PORT environment variable when running the development server. Here's how to do it:

Method 1: Using package.json Scripts

If you use npm or yarn, you can modify the dev script in your package.json to specify a different port.

1. Open your package.json.
2. Locate the scripts section and modify the dev script to include the -p or --port option followed by the desired port number.

For example, to use port 4000:

"scripts": {
  "dev": "next dev -p 4000",
  "build": "next build",
  "start": "next start"
}

Now, running npm run dev or yarn dev will start your Next.js app on port 4000.

Method 2: Using Environment Variables

You can also set the port using an environment variable:

1. Create a .env.local file in the root of your project (if it doesn’t exist).
2. Add the following line to specify the desired port:

PORT=4000

Next.js will read this environment variable and start the app on port 4000 when you run the dev script.

Method 3: Setting Port Directly in the Command Line

If you want to quickly start your Next.js app on a custom port without modifying any files, you can do it directly in the command line:

PORT=4000 npm run dev

or if you're using yarn:

PORT=4000 yarn dev

This will override the default port for that specific run.

Summary

• Modify the dev script in package.json with next dev -p <port>.
• Alternatively, set the PORT in .env.local or directly in the command line.

Let me know if you need further clarification!