javascript node.js Server with html -

i have problem node.js server. want host html document there 1 problem typeerror. cann't find mistake. can me?

var express   =    require("express"); var mysql     =    require('mysql'); var app       =    express(); var fs          = require("fs");  var pool      =    mysql.createpool({     connectionlimit : 100, //important     host     : 'localhost',     user     : 'root',     password : '',     database : 'test',     debug    :  false });  app.get('/', function(req, res) {     fs.readfile('index.html', 'utf-8',function (err, data){         res.writehead(200, {'content-type': 'text/html'});         res.write(data);         res.end();     }); });  app.listen(3000); console.log("server running @ port 3000........"); 

here log:

"c:\program files (x86)\jetbrains\webstorm 11.0.2\bin\runnerw.exe" "c:\program files\nodejs\node.exe" server.js server running @ port 3000........ _http_outgoing.js:430     throw new typeerror('first argument must string or buffer');     ^  typeerror: first argument must string or buffer     @ serverresponse.outgoingmessage.write (_http_outgoing.js:430:11)     @ readfilecontext.callback (c:\........\server.js:21:13)     @ fsreqwrap.readfileafteropen [as oncomplete] (fs.js:303:13) 

later want make mysql connection pooling.

you can use createreadstream , .pipe res @robertklep mentioned, should check if (err) inside readfile callback.

here example

var fs = require('fs'); var http = require('http');  var file = fs.createreadstream('/path/to/file');  var server = http.createserver(function (req, res) {     // res.writehead(200, {     //     'content-type': 'text/plain'     // });      file.pipe(res); });  server.listen('3000'); 

update

so match code using express, don't have much:

var express = require('express'); var app = express();  app.use(express.static(__dirname + '/public'));  app.listen(3000, function () {     console.log('server running @ port 3000........'); }); 

just put assets in public folder , should go. find more info express can go http://expressjs.com/en/4x/api.html