JSFiddle - React, Tailwind, and code Playground

JavaScript

function uniq(a) {
  var seen = {};
  return a.filter(function(item) {
    return seen.hasOwnProperty(item) ? false : (seen[item] = true);
  });
}
function add(newValue, user) {
  fs.readFile('./con.json', function(err, data) {
    var obj = JSON.parse(data);
    obj.twitch[user].push(...newValue);
    var data = uniq(obj.twitch[user]);
    obj.twitch[user] = data;
    fs.writeFile('./con.json', JSON.stringify(obj, null, 2), function(err) { console.log('done'); });
  })
}
const getUser = (name, accessToken, _callback) => {
  const idOptions = {
    url: 'https://api.twitch.tv/helix/users?login=' + name,
    method: "GET",
    headers: {
      'Client-ID': process.env.CLIENT_ID,
      'Authorization': 'Bearer ' + accessToken
    }
  };
  request.get(idOptions, (err, res, body) => {
    if (err) return console.log(err);
    const objekt = JSON.parse(res.body);
    objekt.data.forEach((name, i) => {
      userid = name.id
    })
  });
  _callback();
};
function gameRequest(accessToken, username) {
  setTimeout(() => {
    const gameOptions = {
      url: 'https://api.twitch.tv/helix/users/follows?from_id=' + userid + '&first=100',
      method: 'GET',
      headers: {
        'Client-ID': process.env.CLIENT_ID,
        'Authorization': 'Bearer ' + accessToken
      }
    }
    const gameRequest = request.get(gameOptions, (err, res, body) => {
      let data = [];
      const jsonObjekt = JSON.parse(res.body);
      jsonObjekt.data.forEach((follower, i) => {
        data.push(follower.to_name.toString().toLowerCase().split(' '));
        add(data, username)
      })      
    });
  }, 2000)
}
const options = {
  url: 'https://id.twitch.tv/oauth2/token',
  json: true,
  body: {
    client_id: process.env.CLIENT_ID,
    client_secret: process.env.CLIENT_SECRET,
    grant_type: 'client_credentials'
  }
};
function secondFunction(tName) {
  channels = request.post(options, (err, res, body) => {
    if (err) {
     ...