[Solved]-How to fetch API data from Axios inside the getServerSideProps function in NextJS?-Reactjs

You are not using the jwtToken for anything after passing it to the service.

Before the line const instance = axios.create(options); add something like this:

if (jwtToken !== null) {
  options.headers.Authorization = `Bearer ${jwtToken}`
}

In my NextJS begining I followed this tutorial , and I changed fetch to axios in this way:

export const getStaticPaths = async () => {
   const res = await fetch('https://jsonplaceholder.typicode.com/users');
   const data = await res.json();

   const paths = data.map((ninja) => {
     return {
       params: { id: ninja.id.toString() },
     };
   });

   return {
     paths,
     fallback: false,
   };
};

export const getStaticProps = async (context) => {
   const id = context.params.id;
   const res = await fetch(`https://jsonplaceholder.typicode.com/users/${id}`);
   const data = await res.json();

   return {
     props: { ninja: data },
   };
};

I applied the change using useEffect()

useEffect(() => {
    // const data = await fetch(`https://jsonplaceholder.typicode.com/users/${id}`);
    // const res = await data.json();
    // setninja(res);
    const fetchData = async () => {
      const result = await axios(`https://jsonplaceholder.typicode.com/users/${id}`);

      setninja(result.data);
    };

    fetchData();
    console.log(data);
  }, []);

I hope this info will be useful for you.

Your problem is that your async method does not return a promise.

import service from '../service'

export const getAllAccounts = async (adminToken) => {
  const res = service({ jwtToken : adminToken }).get(`/accounts`);
  return res;
}

Do not use Axios. Just use fetch().

Next.js polyfills fetch() by default on both the client and server, so you can just use it:

In addition to fetch() on the client-side, Next.js polyfills fetch() in the Node.js environment. You can use fetch() in your server code (such as getStaticProps/getServerSideProps) without using polyfills such as isomorphic-unfetch or node-fetch.

Source.