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Using NextJS with TypeScript

Create an empty tsconfig.json file in the root of your project and add dependencies:

# If you’re using npm
npm install --save-dev typescript @types/react @types/node

# If you’re using Yarn
yarn add --dev typescript @types/react @types/node

Now run yarn dev to start the server and Next.js will:

  • Populate the tsconfig.json file for you. You may customize this file.
  • Create the next-env.d.ts file, which ensures Next.js types are picked up by the TypeScript compiler. You should not touch this file.

Here is how you use the types:

import { GetStaticProps, GetStaticPaths, GetServerSideProps } from 'next'

export const getStaticProps: GetStaticProps = async context => {
  // ...

export const getStaticPaths: GetStaticPaths = async () => {
  // ...

export const getServerSideProps: GetServerSideProps = async context => {
  // ...

This is how you use API Routes with TypeScript:

import { NextApiRequest, NextApiResponse } from 'next'

export default (req: NextApiRequest, res: NextApiResponse) => {
  // ...

You can convert pages/_app.js into pages/_app.tsx and use the built-in type AppProps, like so:

import { AppProps } from 'next/app'

function App({ Component, pageProps }: AppProps) {
  return <Component {...pageProps} />

export default App

About Author

Mathias Bothe To my job profile

I am Mathias, born 40 years ago in Heidelberg, Germany. Today I am living in Munich and Stockholm. I am a passionate IT freelancer with more than 16 years experience in programming, especially in developing web based applications for companies that range from small startups to the big players out there. I am founder of, creator of the security service platform BosyProtect© and initiator of several other software projects.