add: added rate limit to the api

back/index.js

@@ -4,12 +4,27 @@ const path = require("path");
 const config = require("./config");
 const cookieParser = require("cookie-parser");
 const cors = require("cors");
+const rateLimit = require("express-rate-limit");
+const slowDown = require("express-slow-down");
 require("dotenv").config();
 
 const app = express();
 var expressWs = require('express-ws')(app);
 const port = config.port || 3000;
 
+const limiter = rateLimit({
+  windowMs: 3 * 1000,
+  max: 20,
+});
+
+const speedLimiter = slowDown({
+  windowMs: 3 * 1000,
+  delayAfter: 20,
+  delayMs: () => 5000,
+});
+
+app.use(speedLimiter);
+app.use(limiter);
 app.use(express.json());
 app.use(cookieParser());
 app.use(cors());