Checkout

README.md

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 ## Build a basic version of PayTM
+
+- Frontend { Responsive }
+- Moving db to cloud

backend/.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
 node_modules
+config.js
+dist
+dist-ssr
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?

backend/config.js

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+//backend/config.js
+module.exports = {
+	JWT_SECRET: "your-jwt-secret",
+	ConnectDB : "mongodb+srv://anuragpratapsingh4845:[email protected]/?"
+}

backend/db.js

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+// backend/db.js
+const mongoose = require('mongoose');
+const { ConnectDB } = require('./config')
+const connectDB = async () => {
+    await mongoose.connect(ConnectDB).then(()=>(console.log("connected")))
+}
+connectDB()
+
+// Create a Schema for Users
+const userSchema = new mongoose.Schema({
+    username: {
+        type: String,
+        required: true,
+        unique: true,
+        trim: true,
+        lowercase: true,
+        minLength: 3,
+        maxLength: 30
+    },
+    password: {
+        type: String,
+        required: true,
+    },
+    firstName: {
+        type: String,
+        required: true,
+        trim: true,
+        maxLength: 50
+    },
+    lastName: {
+        type: String,
+        required: true,
+        trim: true,
+        maxLength: 50
+    }
+});
+
+const accountSchema = new mongoose.Schema({
+    userId: {
+        type: mongoose.Schema.Types.ObjectId, // Reference to User model
+        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

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-const express = require("express");
+// backend/index.js
+const express = require('express');
+const cors = require("cors");
+const rootRouter = require("./routes/index");
+const port = process.env.port || 3000;
+const app = express();
 
+app.use(cors());
+app.use(express.json());
 
+app.use("/api/v1", rootRouter);
+
+app.listen(port);

backend/middleware.js

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