index.js

const { readFile, writeFile } = require('fs').promises;
const { default: axios, AxiosError } = require('axios');
const { Client } = require('fnbr');

const getCosmeticPath = (path) => path
  .replace(/^FortniteGame\/Content/, '/Game')
  .replace(/FortniteGame\/Plugins\/GameFeatures\/BRCosmetics\/Content/, '/BRCosmetics')
  .split('/')
  .slice(0, -1)
  .join('/');

  const fetchCosmetic = async (name, type) => {
    try {
      const { data } = await axios(`https://fortnite-api.com/v2/cosmetics/br/search?name=${encodeURI(name)}&type=${type}`);
      return data.data;
    } catch (err) {
      if (!(err instanceof AxiosError) || err.status !== 404) {
        throw err;
      }
  
      return undefined;
    }
  };

  const handleCommand = async (m) => {
    if (!m.content.startsWith('!')) return;
    const args = m.content.slice(1).split(' ');
    const command = args.shift().toLowerCase();
  
    if (command === 'outfit' || command === 'skin') {
      const skin = await fetchCosmetic(args.join(' '), 'outfit');
      if (!skin) {
        await m.reply(`The skin ${args.join(' ')} wasn't found!`);
        return;
      }
  
      await m.client.party.me.setOutfit(skin.id, undefined, undefined);
      await m.reply(`Set the skin to ${skin.name}!`);
    } 
    
    if (command === 'emote' || command === 'dance') {
      const emote = await fetchCosmetic(args.join(' '), 'emote');
      if (!emote) {
        await m.reply(`The emote ${args.join(' ')} wasn't found!`);
        return;
      }
  
      await m.client.party.me.setEmote(emote.id, getCosmeticPath(emote.path));
      await m.reply(`Set the emote to ${emote.name}!`);
    }

    if (command === 'pickaxe') {
        const pickaxe = await fetchCosmetic(args.join(' '), 'pickaxe')
        if (!pickaxe) {
            await m.reply(`The pickaxe ${args.join(' ')} wasn't found!`)
            return;
        }

        await m.client.party.me.setPickaxe(pickaxe.id, getCosmeticPath(pickaxe.path))
        await m.reply(`Set the pickaxe to ${pickaxe.name}!`)
    }

    if (command === 'backbling' || command === 'backpack') {
        const backpack = await fetchCosmetic(args.join(' '), 'backpack')
        if (!backpack) {
            await m.reply(`The backpack ${args.join(' ')} wasn't found!`)
            return;
        }

        await m.client.party.me.setBackpack(backpack.id, getCosmeticPath(backpack.path))
        await m.reply(`Set the backpack to ${backpack.name}!`)
    }
  };
  
  (async () => {
    let auth;
    try {
      auth = { deviceAuth: JSON.parse(await readFile('./deviceAuth.json')) };
    } catch (e) {
      auth = { authorizationCode: async () => Client.consoleQuestion('Please enter an authorization code: ') };
    }
  
    const client = new Client({ auth });
  
    client.on('deviceauth:created', (da) => writeFile('./deviceAuth.json', JSON.stringify(da, null, 2)));
    client.on('party:member:message', handleCommand);
    client.on('friend:message', handleCommand);
  
    await client.login();
    console.log(`Bot is Online!`);
  })();