A guide on implementing getStaticProps using TypeScript in Next.js

Why am I consistently receiving undefined results when attempting to retrieve all posts from my backend? What could be causing this issue?

import { AppContext } from '@/helpers/Helpers'
import axios from 'axios'
import { GetStaticProps} from 'next'
import React, {useContext} from 'react'
import Tweet from './Tweet'
import { TweetsContainer } from './Tweets.styled'


export interface IAppProps {
}

export default function Tweets(props: any, { allPosts }: any) {
  
  console.log(allPosts);
  
  return (
    <div>
        <TweetsContainer>
            <div>
           </div>
    </TweetsContainer>
    </div>
  );
}

 export const getStaticProps: GetStaticProps = async () => {
   const res = await axios.get(`http://localhost:7000/api/tweets`)
   const data = res.data
   
   return {
     props: { allPosts: data }   
   }
 }

Is this the correct method for retrieving data from an API in Next.js using TypeScript?

Answer №1

Ensure to specify the data type that will be returned by the function. Take a look at the example below featuring user information.

type UserDetails = {
  fullName: string,
  emailAddress: string,
  phoneNumber: string
}

type UserProps = {
  info: UserDetails;
};

export const fetchUserDetails: GetStaticProps<UserProps> = async () => {
  const details: UserDetails = /* implement logic to retrieve user data */;
  return { props: { info: details } };
};

const UserProfile = (props: UserProps) => {
  const { info } = props
  return (
    <div>
      <h1>{info.fullName}</h1>
      <p>{info.emailAddress}</p>
      <p>{info.phoneNumber}</p>
    </div>
  );
};

export default UserProfile;

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