How to create a React JS application with the Pokémon API

We are going to create an application that shows the information of the pokemos, consumed from an API.

Api: https://pokeapi.co/
Github: https://github.com/rodrigolazo/apiPokemon

Code:
App.js

import React, { useEffect } from 'react';
import './App.css';

import CharacterGrid from './components/characters/CharacterGrid'
import Header from './components/ui/Header'

function App() {
  const [result, setResult] = React.useState([]);
  const [poke, setPoke] = React.useState([]);
  const [load, setLoad] = React.useState('true');
  const arr = [];

  useEffect(() => {
    fetch('https://pokeapi.co/api/v2/pokemon/?limit=400')
      .then((response) => response.json())
      .then((data) => setResult(
        data.results.map((item) => {
          fetch(item.url)
            .then((response) => response.json())
            .then((allpokemon) => arr.push(allpokemon));
          setPoke(arr);
        }),
      ));
  }, []);
  setTimeout(() => {
    setLoad(false);
  }, 1000);
  return (
    <div className='container'>
      <Header />

      <CharacterGrid poke={poke} />
    </div>
  );
}
export default App;

Header.js

import React from 'react'
import logo from '../../img/logo.png'

const Header = () => {
  return (
    <header className='center'>
      <img src={logo} alt='' />
    </header>
  )
}

export default Header

CharacterGrid.js

import React from 'react'
import CharacterItem from './CharacterItem'
import Spinner from '../ui/Spinner'

const CharacterGrid = ({ poke, isLoading }) => {
  return isLoading ? (
    <Spinner />
  ) : (
    <section className='cards'>
      {poke.map((item) => (
        <CharacterItem key={item.id} item={item}></CharacterItem>
      ))}
    </section>
  )
}

export default CharacterGrid

CharacterItem.js

import React from 'react'

const CharacterItem = ({ item }) => {
  return (
    <div className='card'>
      <div className='card-inner'>
        <div className='card-front'>
          <img src={item.sprites.other.dream_world.front_default} alt='' />
        </div>
        <div className='card-back'>
          <h1>{item.name}</h1>
          <ul>
            <li>
              <strong>Hp:</strong> {item.stats[0].base_stat}
            </li>
            <li>
              <strong>Experience:</strong> {item.base_experience}
            </li>
            <li>
              <strong>attack:</strong> {item.stats[1].base_stat}
            </li>
            <li>
              <strong>Special:</strong> {item.stats[2].base_stat}
            </li>
            <li>
              <strong>Defence:</strong> {item.stats[3].base_stat}
            </li>
          </ul>
        </div>

      </div>
    </div>
  )
}

export default CharacterItem