opens the requested file and returns the content to the client. If anything goes wrong, throw a 404 error.

var express = require("express");
const bodyParser = require("body-parser");
var fs = require("fs");
var buf = new Buffer(1024);
var app = express();
app.use(bodyParser.urlencoded({
extended: true
}));
app.use(bodyParser.json());
app.get("/", function(request, response){
response.writeHead(200,{'content-type':'text/html'});
response.write('<form name="file_input" method="post">');
response.write('<h1> Select file to view contents of it </h1>');
response.write('<input type="file" name="fname"><br>');
response.write('<input type="submit"><br>');
response.write('</form>');
response.end();
});

app.post('/', function(req, res){

const fn = req.body.fname;	
fs.open(fn, 'r+', function(err, fd) { 
if (err)
	return res.status(400).send({message: "File not found error"});
fs.read(fd, buf, 0, buf.length, 0, function(err, bytes){ 
if (err)
	console.log(err); 
var data =buf.toString();  
res.writeHead(200,{'content-type':'text/html'});	
res.write(data);
});
});

});
app.listen(8080);
console.log("Server is running at http://localhost:8080");