Created index.js

Backend Server

backend/index.js

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+// Importing libraries and declaring global variables
+const express = require("express");
+const jwt = require("jsonwebtoken");
+const cors = require('cors');
+const JWT_SECRET = "hellohidarlingkkrh";
+const app = express();
+const port = 3000;
+let users = [];
+
+
+// Middlewares
+app.use(express.json());
+app.use(cors());
+
+const auth = (req,res,next) => {
+  const token = req.headers.token;
+  const decodedInfo = jwt.verify(token, JWT_SECRET);
+  if (decodedInfo.username) {
+    req.username = decodedInfo.username;
+    next();
+  } else {
+    res.json({
+      message : "You are not logged in"
+    })
+  }
+}
+
+
+// Route Handlers
+// app.get("/", (req,res) => {
+//   res.sendFile(__dirname + "/public/index.html")
+// })
+
+app.post("/signup", (req, res) => {
+  const username = req.body.username;
+  const password = req.body.password;
+
+  users.push({
+    username: username,
+    password: password,
+  });
+
+  res.json({
+    Message: "Welcome Aboard",
+  });
+});
+
+app.post("/signin", (req, res) => {
+  const username = req.body.username;
+  const password = req.body.password;
+
+  const user = users.find(
+    (user) => user.username === username && user.password === password
+  );
+
+  if (user) {
+    const token = jwt.sign(
+      {
+        username: username,
+      },
+      JWT_SECRET
+    );
+    user.token = token;
+    res.json({
+      token: token,
+    });
+  } else {
+    res.status(404).json({
+      Message: "Invalid username or password",
+    });
+  }
+});
+
+app.get("/me", auth, (req, res) => {
+  const token = req.headers.token;
+  const decodedInfo = jwt.verify(token, JWT_SECRET);
+  const username = decodedInfo.username;
+
+  res.json({
+    username: username,
+  });
+});
+
+// Listening port
+app.listen(port, () => {
+    console.log("Server is running!")
+});