add serverside work

@@ -6,6 +6,11 @@
     "@testing-library/jest-dom": "^5.11.4",
     "@testing-library/jest-dom": "^5.11.4",
     "@testing-library/react": "^11.1.0",
     "@testing-library/react": "^11.1.0",
     "@testing-library/user-event": "^12.1.10",
     "@testing-library/user-event": "^12.1.10",
+    "axios": "^0.21.0",
+    "body-parser": "^1.19.0",
+    "dotenv": "^8.2.0",
+    "express": "^4.17.1",
+    "http-proxy-middleware": "^1.0.6",
     "react": "^17.0.1",
     "react": "^17.0.1",
     "react-dom": "^17.0.1",
     "react-dom": "^17.0.1",
     "react-router-dom": "^5.2.0",
     "react-router-dom": "^5.2.0",
@@ -13,7 +18,9 @@
     "web-vitals": "^0.2.4"
     "web-vitals": "^0.2.4"
   },
   },
   "scripts": {
   "scripts": {
-    "start": "react-scripts start",
+    "start": "npm-run-all --parallel start:**",
+    "start:client": "react-scripts start",
+    "start:server": "node ./server/app.js",
     "build": "react-scripts build",
     "build": "react-scripts build",
     "test": "react-scripts test",
     "test": "react-scripts test",
     "eject": "react-scripts eject"
     "eject": "react-scripts eject"
@@ -35,5 +42,8 @@
       "last 1 firefox version",
       "last 1 firefox version",
       "last 1 safari version"
       "last 1 safari version"
     ]
     ]
+  },
+  "devDependencies": {
+    "npm-run-all": "^4.1.5"
   }
   }
 }
 }

+const express = require('express');
+const bodyParser = require('body-parser')
+const app = express();
+const api = require('./routes/index');
+require('dotenv').config();
+
+app.use(bodyParser.json());
+app.use('/api', api);
+
+const port = process.env.PORT || 3001;
+app.listen(port, () => console.log(`Listening on port ${port}`));
\ No newline at end of file

+const express = require('express');
+const router = express.Router();
+
+router.get('/', (req, res) => res.json({data:'this is index.'}));
+
+module.exports = router
\ No newline at end of file

+const proxy = require('http-proxy-middleware');
+
+module.exports = function (app) {
+    app.use(
+        proxy('/api', {
+            target: 'http://localhost:3001/'
+        })
+    );
+};
\ No newline at end of file