Normalise Pokemon API Data

fetch-pokemon.mjs

import {
    promises as fs
} from 'fs'
import fetch from 'node-fetch'

const POKEMON_API_BASE_URL = 'https://pokeapi.co/api/v2'

function extractPokemonIdFromUrl(url) {
    return new URL(url).pathname.split('/').at(-2) ?? ''
}

async function fetchAllPokemon() {
    let url = `${POKEMON_API_BASE_URL}/pokemon?limit=2000`

    const response = await fetch(url)
    const data = await response.json()

    let pokemonData = data.results;

    // Fetch detailed data for each Pokémon
    for (let i = 0; i < pokemonData.length; i++) {
        const pokemon = pokemonData[i]
        const pokemonResponse = await fetch(pokemon.url)
        const pokemonDetailedData = await pokemonResponse.json()

        // Fetch species data for each Pokémon to get the color and habitat
        const speciesResponse = await fetch(pokemonDetailedData.species.url)
        const speciesData = await speciesResponse.json()

        // Include only the attributes we're interested in
        pokemonData[i] = {
            id: pokemonDetailedData.id,
            name: pokemon.name,
            weight: pokemonDetailedData.weight,
            height: pokemonDetailedData.height,
            image: `https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/other/official-artwork/${pokemonDetailedData.id}.png`,
            color: speciesData.color ? {
                id: Number(speciesData.color.url.split("/")[6]),
                name: speciesData.color.name
            } : null,
            habitat: speciesData.habitat ? {
                id: Number(extractPokemonIdFromUrl(speciesData.habitat.url)),
                name: speciesData.habitat.name
            } : null,
            types: pokemonDetailedData.types.map(type => ({
                id: Number(extractPokemonIdFromUrl(type.type.url)),
                name: type.type.name
            }))
        }
    }

    return pokemonData
}

fetchAllPokemon()
    .then(data => {
        fs.writeFile('pokemon_data.json', JSON.stringify(data, null, 2))
            .then(() => console.log('Pokemon data saved to pokemon_data.json'))
            .catch(err => console.error('Error writing file:', err))
    })
    .catch(error => console.error('An error occurred:', error))