Frontend done

backend/config.js

@@ -0,0 +1,3 @@
+module.exports = {
+    JWT_SECRETS: "paytm@prince"    
+}

backend/db.js

@@ -0,0 +1,49 @@
+const mongoose = require("mongoose");
+
+mongoose.connect("mongodb+srv://prince981620:Hello%4012345@cluster0.twgxb.mongodb.net/paytm");
+
+const userSchema = new mongoose.Schema({
+    username: {
+        type: String,
+        required: true,
+        unique: true,
+        trim: true, // trim spaces from begininig and ends
+        lowercase: true,
+        minLength: 3,
+        maxLength: 30
+    },
+    password: {
+        type: String,
+        required: true,
+        minLength: 6
+    },
+    firstName: {
+        type: String,
+        required: true,
+        trim: true,
+        maxLength: 50
+    },
+    lastName: {
+        type: String,
+        required: true,
+        maxLength: 50
+    }
+})
+const accountSchema = new mongoose.Schema({
+    userId: {
+        type: mongoose.Schema.Types.ObjectId,
+        ref: 'User',
+        required: true
+    },
+    balance: {
+        type: Number,
+        required: true
+    }
+})
+const Account = mongoose.model("account",accountSchema);
+const User = mongoose.model("User",userSchema);
+
+module.exports = {
+    User,
+    Account
+}

backend/index.js

@@ -1,3 +1,14 @@
 const express = require("express");
+const mainRouter = require("./routes/index");
+const cors = require("cors");
 
+const app = express();
 
+app.use(cors());
+app.use(express.json());
+// all the req for /api/v1 goes to mainRouter i.e /routes/index.js
+app.use("/api/v1",mainRouter);
+
+app.listen(3000,()=>{
+    console.log("listening on port 3000");
+})

backend/middileware.js

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+const jwt = require("jsonwebtoken");
+const { JWT_SECRETS } = require("./config");
+
+
+const authMiddleware = (req,res,next)=>{
+    const authHeader = req.headers.authorization;
+    if(!authHeader || !authHeader.startsWith('Bearer ')){
+        return res.status(411).json({});
+    }
+    const token = authHeader.split(" ")[1];
+
+    try{
+        const decoded = jwt.verify(token,JWT_SECRETS);
+        if(decoded.userId){
+            req.userId = decoded.userId;
+            next();
+        }else{
+            return res.status(403).json({});
+        }
+    }catch(err){
+        return res.status(403),json({});
+    }
+}
+module.exports = {
+    authMiddleware
+}