index.js

const express = require('express');
const app = express();
const path = require('path');
const fs=require('fs');

app.set("view engine","ejs");
app.use(express.json());
app.use(express.urlencoded({extended: true}));

app.use(express.static(path.join(__dirname,"public")));

app.get('/',function(req,res){
    fs.readdir(`./files`,function(err,files){
       res.render("index",{files:files});  
    })
})

app.get('/file/:filename',function(req,res){
   fs.readFile(`./files/${req.params.filename}`,"utf-8",function(err,filedata){   // utf helps to convert data into english
        res.render('show',{filename:req.params.filename,filedata:filedata});  // re.rendor means open file in new page
   })     
})



app.get('/edit/:filename',function(req,res){
      res.render('edit',{filename: req.params.filename});
})



app.post('/edit',function(req,res){
    fs.rename(`./files/${req.body.previous}`,`./files/${req.body.new}`,function(err){
      res.redirect("/");
    })
})


app.post('/create',function(req,res){
   fs.writeFile(`./files/${req.body.title.split('').join("")}.txt`,req.body.details,function(err){
    res.redirect("/");
   });
})
app.listen(3000);