have to slove dependency

+var request = require("request");
+var express = require('express');        
+var puuid_url_list=[]
+var events=require('events')
+var key = "RGAPI-78e43419-9016-45e3-8300-1e5febc8ef54" // LOL API key
+var app = express();
+var eventEmitter=new events.EventEmitter();
+var bodyParser = require('body-parser');
+let puuid
+let option
+let checking=1
+app.use(bodyParser.urlencoded({ extended: false }));
+app.use(bodyParser.json());
+var name_list=[] // 유저의 아이디와 매칭되는 고유번호
+var puuid_list=[] // puuid 저장을 위한 리스트
+
+
+app.get('/', function (req, res) {
+	res.send("My galaxy") // 버튼 구현 (은하계(맵) 으로 이루어진 버튼들) => 버튼 클릭시 해당 url로 get 하여 데이터 획득
+});
+
+
+app.get('/galaxy',function(req,res)
+{
+  name_url="https://kr.api.riotgames.com/tft/league/v1/challenger?api_key="+key
+
+  request(name_url,function(err,res,body)
+  {
+    let json = JSON.parse(body) //json으로 파싱
+          var name=json['entries']
+          for (var value in name)
+          {
+              name_list.push(name[value]["summonerId"])
+              
+		  }
+      eventEmitter.emit('name_done')
+  }); //request1 END
+
+
+  eventEmitter.on('name_done',function() //url 설정
+  {
+
+  for (i=0;i<name_list.length;i++)
+  {
+    puuid_url_list.push("https://kr.api.riotgames.com/tft/summoner/v1/summoners/"+name_list[i])
+    
+  }
+  eventEmitter.emit("setting_done")
+});//setting end
+  
+
+  eventEmitter.on("setting_done",function() //puuid 가져오기
+  {
+    if (checking==1)
+    {
+    option={
+    url:puuid_url_list[0],
+    method: 'GET',
+    headers:{
+      "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.61 Safari/537.36",
+      "Accept-Language": "ko-KR,ko;q=0.9,en-US;q=0.8,en;q=0.7",
+      "Accept-Charset": "application/x-www-form-urlencoded; charset=UTF-8",
+      "Origin": "https://developer.riotgames.com",
+      "X-Riot-Token": key}
+              }
+    eventEmitter.emit("run_request") //for 문 마다 run_request를 한다.
+
+    }
+ else
+ {
+ 
+  for (i=1;i<name_list.length;i++)
+  {
+    eventEmitter.emit("run_request")
+    eventEmitter.on('run_request2',function(){
+    option={
+    url:puuid_url_list[i],
+    method: 'GET',
+    headers:{
+      "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.61 Safari/537.36",
+      "Accept-Language": "ko-KR,ko;q=0.9,en-US;q=0.8,en;q=0.7",
+      "Accept-Charset": "application/x-www-form-urlencoded; charset=UTF-8",
+      "Origin": "https://developer.riotgames.com",
+      "X-Riot-Token": key}
+    }
+     //for 문 마다 run_request를 한다.
+ });
+  }
+}
+    eventEmitter.emit('data_received')
+
+  });//event-setting done end
+  
+eventEmitter.on('run_request',function()//자료 가져오기 (puuid)
+{
+ request(option,function(err,res,body)
+  
+  {
+    puuid = JSON.parse(body)
+    puuid=puuid["puuid"]
+    puuid_list.push(puuid)
+    if (checking==1)
+    {
+    checking=2
+    eventEmitter.emit("setting_done")
+    
+    
+    }
+    else
+    {
+      eventEmitter.emit("run_request2")
+    }
+    
+  });
+}); //run_request end
+  
+
+});// app end
+
+
+var server = app.listen(80);
+eventEmitter.on('data_received',function(){
+	console.log(name_list);
+  console.log(puuid_list)
+});
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