pokemon.js

/*
Functions that call PokéAPI

https://pokeapi.co/docs/v2
*/

function generatePokemon() {
  // Fetch json of all available pokemon up to a limit of 2000 (~1200 avilable)
  return fetch('https://pokeapi.co/api/v2/pokemon/?limit=2000')
    // Parse to json
    .then(res => {
      return res.json();
    })
    // Extract results
    .then(json => {
      return json.results;
    })
    // Return random item from list
    .then(resultList => {
      return resultList[Math.floor(Math.random() * resultList.length)];
    });
}

// Fetches the sprite using the pokemon's api url
function fetchSprite(url) {
  return fetch(url)
    // Converts result to json
    .then(res => {
      return res.json();
    })
    // returns the url of the sprite
    .then(json => {
      return json.sprites;
    });
}

// Fetches the pokemon's names in different languages
function fetchNames(nameOrId) {
  return fetch(`https://pokeapi.co/api/v2/pokemon-species/${nameOrId}/`)
  // Parse to json
  .then(res => res.json())
  // Get names as array
  .then(json => json.names)
  // Format names
  .then(names => {
    let resultNames = [];
    for (let i = 0; i < names.length; i++) {
      resultNames.push({
        languageName: names[i].language.name,
        languageUrl: names[i].language.url,
        name: names[i].name
      });
    }
    return resultNames;
  }).catch(err => {
    // For example id 10220 gives back Not Found (404)
    return null;
  });
}

// Exports each function separately
module.exports.generatePokemon = generatePokemon;
module.exports.fetchSprite = fetchSprite;
module.exports.fetchNames = fetchNames;