Using http.createServer with Express - node.js

Can someone see the problem in this code? It must be something simple but I can't see it.
var express = require('express');
var debug = require('debug')('untitled1:server');
var http = require('http');
var app = express();
var router = express.Router();
app.use('/API',router);
app.route('/book').get(function(req, res) {
res.render('./index');
});
var server = http.createServer(app);
server.listen('3000');
server.on('error', onError);
server.on('listening', onListening);
...

You are missing an view engine. Try to add this line, it should solve your problem.
app.set('view engine', 'jade');

Related

Express router and routes Node.js

I get this error when I try to route my
My code
'use strict';
const express = require('express');
const app = express ();
const chatCat = require ('./app');
app.set('port', process.env.PORT || 3000);
app.use(express.static('public'));
app.set('view engine', 'ejs');
app.use('/', chatCat.router);
app.listen(app.get('port'), () => {
console.log('running on port:', app.get('port'));
});
Error
throw new TypeError('Router.use() requires a middleware function but got a ' + gettype(fn))
^
I tried routing but it keeps giving me errors from my express.js.
Try this code:
var express = require('express');
var app = express();
app.set('port', process.env.PORT || 3000);
app.use(express.static('public'));
app.set('view engine', 'ejs');
var chatCat = require('./app');
app.use('/',chatCat);
app.listen(port,function(){
console.log("Server is running on port: "+port);
});
Try creating app with this https://expressjs.com/en/starter/generator.html it will create nice structure for your project. As for your error - it needs to be express middleware function. You can't import router from your app.js as it don`t have such property. If you want to have route described here use:
app.method('/yourRoute', function(req, res, next){
//your middleware code
});
also change this:
app.listen(app.get('port'), () => {
console.log('running on port:', app.get('port'));
});
to this:
app.listen(3000);
And you can change 3000 to any unused port you want

Emitting and receiving events with Socket.io

I'm trying to emit an event with socket.io on my Node Js server and receive it client-side but I can't get it to work.
This is my server code:
// require our dependencies
var express = require('express');
var expressLayouts = require('express-ejs-layouts');
var bodyParser = require('body-parser');
var app = express();
var port = 3000;
var server = require("http").Server(app);
var io = require('socket.io')(server);
// use ejs and express layouts
app.set('view engine', 'ejs');
app.use(expressLayouts);
// use body parser
app.use(bodyParser.json({extended : true}));
// route our app
var router = require('./app/routes');
app.use('/', router);
// set static files (css and images, etc) location
app.use(express.static(__dirname + '/public'));
// start the server
app.listen(port, function() {
console.log('app started');
});
This is my routes.js code, where the magic should happen:
module.exports = function(io){
// require express
var express = require('express');
var path = require('path');
// create our router object
var router = express.Router();
// export our router
//module.exports = router;
router.post("/", function(request, response) {
console.log(request.body);
io.emit('getupdate',{hello:'world'});
});
// route for our homepage
router.get('/showevent', function(req, res) {
res.render('pages/showevent',{data:exportage});
});
return router;
}
While this is my client-side script:
<script src="/socket.io/socket.io.js"></script>
<script>
var socket = io.connect('http://localhost:3000');
socket.on('getupdate', function (data) {
console.log(data);
});
</script>
On the routes.js file, to get the "io" variable i wrapped all inside a function.
I can't get the message emitted in case of a POST request on my client.
Could you help me to find the issue here ?
Try this:
// require our dependencies
var express = require('express');
var expressLayouts = require('express-ejs-layouts');
var bodyParser = require('body-parser');
var app = express();
var port = 3000;
var server = app.listen(port);
var io = require('socket.io').listen(server);
I am not sure if you have updated this in your own code, but this snippet should pass io to the router:
// route our app
var router = require('./app/routes')(io);
app.use('/', router);

Not able to connect Socket.io in express

I tried with a different solution to connect to the socket.io but I am not able to connect to it following is my code snippet.
app.js
var express = require('express');
var index = require('./routes/index');
var users = require('./routes/users');
var app = express();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');
app.use('/', index);
app.use('/users', users);
var http = require('http').Server(app);
var io = require('socket.io')(http);
io.on('connection', function(socket) {
console.log('Client connected.');
});
http.listen(3000, function(){
console.log('listening on *:3000');
});
index.jade
extends layout
script(src='/socket.io/socket.io.js')
script.
var socket = io();
Package.json after installing socket.io
"socket.io": "^2.0.3"
Please suggest me where I am doing wrong
Try with new key word, may be it will work
var app = new express();

Page hangs while doing operation on MongoDb database

I am using Cloude 9 environment for developing my nodejs app. In that I have written code to connect to mongodb database. I am successfully connecting to database. But when I try to do operations on database the page becomes not responsive and hangs.
Below is the code of my server.js file
var Db = require('mongodb').Db;
var http = require('http');
var path = require('path');
var async = require('async');
var socketio = require('socket.io');
var express = require('express');
var ejs = require('ejs');
var app = express();
var helpers = require('express-helpers')
var MongoClient = require('mongodb').MongoClient;
var Server = require('mongodb').Server;
var db;
helpers(app);
var bodyParser = require('body-parser');
app.use(bodyParser.json()); // for parsing application/json
app.use(bodyParser.urlencoded({extended: true})); // for parsing application/x-www-form-urlencoded
var server = http.Server(app);
server.listen(process.env.PORT || 3000, process.env.IP || "0.0.0.0", function () {
var addr = server.address();
console.log("Chat server listening at", addr.address + ":" + addr.port);
});
app.use(express.static(__dirname + '/public'));
app.set('views', __dirname + '/public/views');
app.engine('html', require('ejs').renderFile);
app.set('view engine', 'html');
//app.use(express.static(__dirname + '/client'));
app.use(express.static(path.join(__dirname, '/client')));
// MongoDB Connection
app.use(function(req, res, next) {
next();
})
app.post('/ajax-mongo-connect', function (req, res) {
var mongoClient = new MongoClient(new Server('localhost', 27017));
mongoClient.open(function(err, mongoClient) {
if(err){
console.log(err);
}else{
var db = mongoClient.db("mydb");
console.log('database connected',db);
mongoClient.close();
}
})
})
Note that from my view page I am calling action ajax-mongo-connect with POST method. To call goes to app.post('/ajax-mongo-connect'... but page becomes irresponsible and hangs.
Let me know what I am doing.
You need to return something in your /ajax-mongo-connect route, for example res.send('its working dude!'); or call the next() function.
Cheers!

Access the public folder when using node and Express?

I have looked through stackoverflow and read the express documentation, I can't figure out why the app won't run when I implement "app.use(express.static());" does anyone know a fix?
var express = require('express')();
var app = require('express')();
var server = require('http').Server(app);
var io = require("socket.io").listen(server);
//If i use this my app will not start
// app.use(express.static());
app.get('/', function(req, res){
res.sendfile('index.html');
});
//Get input from front-end
io.on('connection', function(socket){
// On input do something
socket.on('directional in', function(unique_id, input, input1){
// send info to index
io.emit('directional out', unique_id, input, input1);
});
});
server.listen(3000, function(){
// Server is running
console.log('listening on *:3000');
});
Any help would be great!
You're not initialising express correctly. The correct way would be as follows:
var express = require('express');
var app = express();
With this, you will be able to do
app.use(express.static(__dirname + '/public'));
All together, a fully functional express app would look like this in its most basic form:
var express = require('express');
var app = express();
app.use(express.static(__dirname + '/public'));
app.listen(process.env.PORT || 3000);
Let me know what happens.

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