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server.js

+const express = require('express');
+const cors = require('cors');
+const mongoose = require('mongoose');
+
+require('dotenv').config();
+
+const app = express();
+const port = process.env.PORT || 5000;
+
+app.use(cors());
+app.use(express.json());
+
+const uri = process.env.ATLAS_URI;
+mongoose.connect(uri, { useNewUrlParser: true, useCreateIndex: true , useUnifiedTopology: true}
+);
+const connection = mongoose.connection;
+connection.once('open', () => {
+  console.log("MongoDB database connection established successfully");
+})
+
+const bookRouter = require('./routes/book');
+const usersRouter = require('./routes/user');
+const borrowerRouter = require('./routes/borrower');
+const adminRouter = require('./routes/admin');
+
+if(process.env.NODE_ENV === 'production'){
+  app.use(express.static('client/build'));
+}
+
+app.use('/book', bookRouter);
+app.use('/user', usersRouter);
+app.use('/borrower',borrowerRouter);
+app.use('/admin', adminRouter);
+
+
+app.listen(port, () => {
+    console.log(`Server is running on port: ${port}`);
+});
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