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Next.js TypeScript: Enhancing Developer Experience And Code Reliability

07 November 2023 by Sara Wahba

In web development, choosing the right technology stack is crucial. Developers often seek tools and frameworks that not only simplify the development process but also enhance code reliability. One such powerful combination is Next.js TypeScript. 

Join Kapsys as we explore the benefits of using Next.js TypeScript and how this pairing can revolutionize your web development projects.

Before we dive into the specifics of Next.js TypeScript, let's start with the basics. What is Next.js, and why should you consider it for your next web project?

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What Is Next.js?

Next.js is a popular open-source React framework that simplifies building robust and performant web applications. Developed by Vercel, Next.js has several built-in features, such as server-side rendering (SSR)static site generation (SSG), and automatic code splitting, making it an ideal choice for building modern web applications.

what is next js

Why Use Next.js? 

Here are some key advantages of using Next.js:

  • SEO-Friendly: Next.js helps your website rank higher in search engine results by enabling server-side rendering, which provides search engines with well-structured, crawlable content.

  • Improved Performance: With automatic code splitting and lazy loading, Next.js ensures that your web applications load quickly and efficiently, providing a seamless user experience.

  • Optimized Developer Experience: The framework offers hot module replacement (HMR) and a built-in development server, making the development process smoother and more enjoyable.

  • Zero Configuration: You can create a Next.js project with minimal configuration using the npx create-next-app --typescript command, which we'll explore shortly.

Next.js TypeScript is a powerful union that can change your developing process drastically. Let's explore what TypeScript is in the next section.

Read: SEO Best Practices In Next.js Applications: Search-Engine Friendly

What Is TypeScript? 

TypeScript, developed by Microsoft, is a superset of JavaScript, enhancing it with optional static typing and key features:

  • Static Typing: Ensures type safety, catching errors before runtime improving code quality.

  • Type Inference: Automatically deduces variable types, balancing typing and developer convenience.

  • Interfaces and Custom Types: Define data shapes and promote code consistency.

  • Enums: Create named constant sets for more precise, self-explanatory code.

  • Classes: Supports object-oriented concepts like classes and inheritance.

  • Modules: Organizes code with CommonJS and ES6 module systems.

  • Tooling: Offers excellent IDE support, including autocompletion and error checking.

  • Compatibility: Easily integrates with existing JavaScript projects.

  • Rich Ecosystem: Widely adopted in libraries and frameworks like React and Node.js.

  • Community Support: Backed by a strong community with extensive documentation.

TypeScript shines in large projects, ensuring type safety and code maintainability while allowing gradual adoption in existing codebases. Now, you can see how compatible Next.js TypeScript is and how much potential they have if combined. 

Next js with TypeScript

Next.js TypeScript: Why Using Them Together? 

Using Next.js TypeScript together offers several compelling advantages, making it a powerful combination for web development.

Let's explore the key reasons why you should consider using Next.js TypeScript:

Type safety

TypeScript brings static typing to JavaScript, reducing runtime errors and making your code more predictable. This can help catch bugs early in the development process, leading to more reliable code.

Enhanced developer productivity

Next.js TypeScript's rich development tooling, including autocompletion and type inference, can significantly improve your development speed and overall productivity.

Ecosystem compatibility

TypeScript seamlessly integrates with popular JavaScript libraries and frameworks, including React, which powers Next.js. This means you can leverage the vast ecosystem of JavaScript packages while enjoying the benefits of TypeScript.

Improved collaboration

With Next.js TypeScript, your code becomes more self-documenting, making it easier for team members to understand and collaborate on the project. TypeScript's type annotations act as documentation for your code.


As projects grow, maintaining and extending the codebase can become challenging. TypeScript helps in maintaining and scaling your codebase, ensuring long-term code reliability.

Strong community support

Both Next.js and TypeScript have thriving communities, which means you can find extensive documentation, tutorials, and community support to help you overcome challenges and optimize your development process.

Next.js TypeScript offers a powerful combination that enhances developer experience and code reliability. It provides the best of both worlds: the performance and ease of development of Next.js and the type safety and tooling of TypeScript.

Read: Serverless Functions in Next.js: A Practical Guide

Creating a Next.js Project with TypeScript

Creating a project that combines these technologies seamlessly is the first step to leveraging the power of Next.js TypeScript. Fortunately, this process is straightforward and well-documented.

To create a new Next.js project with TypeScript, open your terminal and run the following command:

npx create-next-app my-next-app --typescript

In this command, my-next-app is the name of your project. You can replace it with your preferred project name. The --typescript flag ensures that your Next.js project is set up to work with TypeScript, including the necessary configurations and dependencies.

Once the project is created, navigate to your project directory using the cd my-next-app command, and you're ready to start developing with Next.js TypeScript.

Read: Getting Started With Next.js To Set Up A New Project

The Role of tsconfig.json

A crucial aspect of developing Next.js TypeScript is the tsconfig.json file. This configuration file defines how TypeScript should compile your code and provides essential settings for your project. In a Next.js project, the tsconfig.json file is instrumental in making Next.js TypeScript work seamlessly together.

Here's a quick overview of some critical configurations in the tsconfig.json file for a Next.js TypeScript project:

  • compilerOptions.target: Specifies the ECMAScript version to target. For modern browsers, you can set it to "ESNext".

  • compilerOptions.lib: Lists the libraries available in your project.

  • compilerOptions.module: Defines the module system, typically set to "ESNext" for Next.js projects.

  • compilerOptions.strict: Enforces strict type checking, catching potential issues at compile-time.

  • include: An array of file or directory patterns to include in the TypeScript compilation process.

  • exclude: A variety of file or directory patterns to exclude from the compilation.

You can tailor the tsconfig.json file to suit the specific needs of your project, but Next.js TypeScript provides sensible defaults to get you started quickly.

How to Add TypeScript to an Existing Project 

If you have an existing Next.js project and want to enhance it with TypeScript, the process is relatively straightforward. Integrating Next.js TypeScript into a current project can bring enhanced type safety, improved code quality, and better development experiences. 

To add TypeScript to your project:

  • Install TypeScript: Add TypeScript as a development dependency to your project. Run the following command in your project directory:

npm install --save-dev typescript

This will install TypeScript for your project.

  • Initialize TypeScript Configuration: Next, initialize a TypeScript configuration file by running:

npx tsc --init

This will create a tsconfig.json file in your project directory. You can customize this file to suit your project's needs.

  • Rename .js Files to .ts or .tsx: To gradually convert your JavaScript files to TypeScript, rename your existing .js files to either .ts (for TypeScript code) or .tsx (for TypeScript with JSX). You can start with a single file and gradually convert others.

  • Install Type Definitions: If you're using external libraries, you may need to install TypeScript type definitions for them. For example, if you're using React, install the types for React and React DOM:

npm install --save-dev @types/react @types/react-dom
  • Type Checking: After making these changes, you can run the TypeScript compiler to check for type errors:

npx tsc

Fix any type of errors that arise.

With these steps, you've successfully added TypeScript to your existing Next.js project, improving code quality and development experience.

Read: Choosing An Architecture Pattern for Next.js Applications

Creating TypeScript Types in Next.js

TypeScript allows you to create custom types tailored to your project's needs. In a Next.js TypeScript project, you can define types for data, components, and more. 

Here's how to create TypeScript types:

  • Create Types Directory: In your project, create a directory named types to store your custom type definitions. This directory can be placed within your project's source code directory.

  • Define Custom Types: Within the types directory, create TypeScript files to define your custom types. For example, if you want to define a type for a user, create a file named user.ts:

// types/user.ts
export interface User {
  id: number;
  name: string;
  email: string;

This defines a custom user type with idname, and email properties.

  • Import and Use Types: You can import and use these custom types in your project files. For example:

import { User } from '../types/user';

const user: User = {
  id: 1,
  name: 'John Doe',
  email: 'john@example.com',

This ensures type safety and code consistency within your Next.js TypeScript project.

By creating and using custom Next.js TypeScript types, you improve code clarity and make your application more maintainable.

Read: Steps To Upgrade Previous Versions Of Next.js

Creating Components Next.js TypeScript

Next.js provides a robust framework for building web applications, and when combined with TypeScript, it offers additional advantages in terms of type safety and development efficiency.

Here's how to create components in a Next.js TypeScript project:

  • Component Structure: Begin by organizing your component files within a designated directory in your project. Conventionally, Next.js projects have a components directory for this purpose.

  • Component File: Create a .tsx file for your component. The .tsx extension allows you to include JSX and TypeScript within the same file. For example, you can create a MyComponent.tsx file.

  • Component Code: Write the component code within the .tsx file. Here's a simple example of a stateless functional component:

// components/MyComponent.tsx
import React from 'react';

interface MyComponentProps {
  text: string;

const MyComponent: React.FC<MyComponentProps> = ({ text }) => {
  return <div>{text}</div>;

export default MyComponent;

In this example, we define a component that receives a text prop and displays it within a div element.

  • Usage: You can now import and use your component in other parts of your Next.js TypeScript project. For example:

// pages/index.tsx
import MyComponent from '../components/MyComponent';

const HomePage: React.FC = () => {
  return (
      <h1>Next.js TypeScript Example</h1>
      <MyComponent text="Hello, TypeScript!" />

export default HomePage;

Here, we import and use the MyComponent within a page component.

By structuring your components and using Next.js TypeScript to define props and component types, you ensure type safety and code consistency in your Next.js project.

Read: Integrating with External APIs in Next.js: A Comprehensive Guide

Debugging in Next.js with TypeScript

Debugging is an integral part of the development process. With Next.js TypeScript, you have access to powerful debugging tools to help identify and fix issues in your code efficiently.

Here are some ways to debug your Next.js TypeScript project:

  • Visual Studio CodeIf you're using Visual Studio Code, it offers excellent support for TypeScript and Next.js. You can set breakpoints, inspect variables, and step through your code seamlessly.

  • Console Logging: Good old console.log statements can be invaluable for debugging. Next.js supports server-side logging, so you can use console.log in both the server and client-side code to troubleshoot issues.

  • React DevTools: As Next.js is built on React, you can use the React DevTools browser extension to inspect the component hierarchy and state of your React components.

  • TypeScript Compiler Errors: TypeScript provides helpful error messages that can point you directly to the source of the issue in your code.

create next js project with typescript


The fusion of Next.js TypeScript equips developers with a powerful toolkit for building robust web applications. Whether starting a new project or enhancing an existing one, the advantages are clear: enhanced type safety, improved code quality, and a more efficient development experience. 

As you embark on your web development journey, the Next.js TypeScript duo proves to be a valuable ally, delivering not only efficiency but also the assurance of code reliability in the dynamic world of web development.

Stay tuned with Kapsys and learn all about efficient coding!