Promise All Example

PokemonFetch.js

const apiURL = "https://pokeapi.co/api/v2/type/1";

const pokemonFetch = async () => {
	const initial = await fetch(apiURL);
	const initialJson = await initial.json();

	const detailsData = initialJson.pokemon.map(async i => {
		const preFetchData = await fetch(i.pokemon.url);
		return preFetchData.json();
	})
  
  const payload = (await Promise.all(detailsData)).map(data => ({
		name: data.name,
		image: data.sprites['front_default']
	}))
	return payload;
}

pokemonFetch().then(resp => {
  console.log(resp);
});