server.js

require('dotenv').config();
const express=require('express');
const mongoose=require('mongoose');
const cors=require('cors');
const helmet=require('helmet');
const notesRouter=require('./routes/notes');
const errorHandler=require('./middleware/errorHandler');
const app=express();//web server instance
app.use(helmet());
app.use(cors());
app.use(express.json({limit:'10mb'}));
app.use(express.urlencoded({extended:true}));
//mongo db connection
mongoose.connect(process.env.MONGODB_URI).then(()=>{
    console.log('MongoDB connected');
}).catch(err=>{
    console.error('MongoDB Connection Error: ',err);
    process.exit(1);
});
app.use('/api',notesRouter);
app.use(errorHandler);
const PORT=process.env.PORT||5000;
app.listen(PORT,()=>{
    console.log(`Server running on http://localhost:${PORT}`);
});