index.js

const express = require('express');
const app= express();
const path = require('path');
const fs = require('fs');
const { log } = require('console');

app.set("view engine","ejs");

//middlewares
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){
        res.render('show', {filename: req.params.filename, filedata: filedata});
    }) 
})
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);