[UPDATE]login,logout

-const express = require('express');
-const app = express();
-const mongoose=require('mongoose');
+let express = require('express');
 let bodyParser = require('body-parser');
-mongoose.connect('mongodb+srv://sjieu17:tjrwls147714@cluster0.lc6pe.mongodb.net/weather_briefing?retryWrites=true&w=majority');
-let session = require('express-session');
-app.use(session({ secret: 'keyboard cat', cookie: { maxAge: 60000 }}));
-app.use(bodyParser.urlencoded({ extended: false }));
-app.use(bodyParser.json());
-let logid={
-    name:"",
-    id:"",
-    password:"",
-    sex:-1,
-    log:false
-};
-
-let db=mongoose.connection; // 몽고디비를 어떻게 사용해야하는지를 정확히 몰라서 우선 이렇게 해보겠습니다.
-db.on('error',function(){
-    console.log('Connection Failed!');
-});
+let mongoose = require('mongoose');
 
-db.once('open',function(){
-    console.log('Connected!');
+let app = express();
+let logid=null;
+const uri = 'mongodb+srv://sjieu17:tjrwls147714@cluster0.lc6pe.mongodb.net/weather_briefing?retryWrites=true&w=majority';
+let db = mongoose.connect(uri, (err) => {
+	if (err) {
+		console.log(err.message);
+	} else {
+		console.log('Succesfully Connected!');
+	}
 });
 
-let user=mongoose.Schema({
-    name:String,
-    id:String,
-    password:String,
-    sex:Number
+var UserSchema = new mongoose.Schema({
+	name: String,
+	id: String,
+    password: String,
+	gender:Number
 });
-let User=mongoose.model('users',user);
-app.post('/signup',(req,res)=>{
-    let newUser=new User(req.body);
-    newUser.save((err)=>{
-        if (err) return res.status(500).json({message:"저장실패"});
-        else return res.status(200).json({message:"저장 성공!",data: newUser});
-
-    })
+
+var Users = mongoose.model('users', UserSchema);
+
+app.use(bodyParser.json());
+app.use(bodyParser.urlencoded({ limit: '1gb', extended: false }));
+
+app.post('/signup', (req, res) => {
+    Users.findOne({ id: req.body.id, password: req.body.password }, (err, user) => {
+		if (err) return res.status(500).json({ message: '에러가 발생하였습니다.' });
+		else if (user){
+            res.send('이미 존재하는 사용자입니다.');
+        }
+		else{
+            var new_user = new Users(req.body);
+
+            new_user.save((err) => {
+                if (err) return res.status(500).json({ message: '회원가입에 실패하였습니다.' });
+                else return res.status(200).json({ message: '회원가입이 완료되었습니다.', data: new_user });
+            });
+        }
+	});
+
 });
-// app.post('/login',(req,res)=>{
-//     User.findOne({id: req.body.id, password:req.body.password},(err,user)=>{
-//         if(err){
-//             res.send('아이디와 비밀번호를 다시 확인해주십시오.');
-//         }else{
-//             res.send('로그인 되었습니다.');
-//         };
-//     });
-// });
+
 app.post('/signin', (req, res) => {
-	User.findOne({ id: req.body.id, password: req.body.password }, (err, user) => {
-		if (err) return res.status(500).json({ message: '에러!' });
-		else if (user) return res.status(200).json({ message: '유저 찾음!', data: user });// 저장되지 않은 유저도 찾았다고 나옴
-		else return res.status(404).json({ message: '유저 없음!' });
+	Users.findOne({ id: req.body.id, password: req.body.password }, (err, user) => {
+		if (err) return res.status(500).json({ message: '에러가 발생하였습니다.' });
+		else if (user){ 
+            logid={id:user.id,password:user.password,name:user.name,gender:user.gender};
+            return res.status(200).json({ message: '로그인 되었습니다.', data: user });
+        }
+		else return res.status(404).json({ message: '아이디와 비밀번호를 다시 확인해주세요.' });
 	});
 });
 app.post('/logout',(req,res)=>{
-    logid.id=null;
+    logid=null;
     res.send('로그아웃 되었습니다.');
 });
-let server = app.listen(80);
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+app.listen(4000, () => console.log('Server On 4000'));
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