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Next JS Dynamic API Routes

Last Updated : 23 Jul, 2025

Next.js dynamic API routes allow you to create flexible endpoints that can handle various parameters, enabling powerful and versatile server-side functionalities within your application.

• JavaScript and React JS basics
• Familiar with Next JS
• Restful API's concept

Dynamic API routes in Next.js enable the creation of endpoints that can capture and process URL parameters dynamically. These routes allow your application to handle various resource requests identified by unique parameters, making it easier to build APIs that interact with multiple resources. This feature is particularly useful for developing complex applications requiring adaptable and scalable server-side logic.

Dynamic API Routes in Next.js follows a pre-defined syntax to declare Dynamic API routes. To declare a Dynamic API routes in Next.js you need to write the file name or folder name in square brackets "[]". then, write the code of the application in the function.

Syntax:

[folder_name] or [file_name].jsx 

Step 1: Create a NextJs app using the following command.

npx create-next-app my-app

Step 2 : Got to the project directory and create a main Folder students in "src/app" directory

cd my-app
src -> app -> new_folder_name = students

Step 3 : Create a new Folder with [studentId] inside students folder.

mkdir [studentId]

Step 4 : Create a new file inside [studentId]

example:/src/app/students/[studentId]/page.jsx

Project Structure:

The updated dependencies in package.json file will look like:

"dependencies": {
    "react": "^18",
    "react-dom": "^18",
    "next": "14.0.4"
},
"devDependencies": {
    "typescript": "^5",
    "@types/node": "^20",
    "@types/react": "^18",
    "@types/react-dom": "^18",
    "autoprefixer": "^10.0.1",
    "postcss": "^8",
    "tailwindcss": "^3.3.0",
    "eslint": "^8",
    "eslint-config-next": "14.0.4"
}

Example: Write the following code in page.jsx file.

// page.jsx

// The params object contains route parameters as KEY-VALUE pairs
export default function Students({ params }) {
  return (
    <main>
      <div className="font-semibold text-xl ml-10">
        {/* Students List with different student Id */}
        <h3 className="font-bold text-2xl">Students List</h3>
        I am Geek {params.studentId}
      </div>
    </main>
  );
}

Step To run the application:

Step 1: Run the following command in the terminal

npm run dev 

Test your dynamically created API routes by visiting "http://localhost:3000/students/1, http://localhost:3000/students/2, .... http://localhost:3000/students/1000, etc. " in your browser

http://localhost:3000/students/1
http://localhost:3000/students/2
http://localhost:3000/students/3
..........
..........
..........
..........
http://localhost:3000/students/1000

Output: For different Dynamic API Path, It will generate a different content on UI to be rendered. Some of them are as shown below.

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