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Commit a9d468d0 authored by Andrej Rasevic's avatar Andrej Rasevic
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adding express code

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var express = require('express');
var router = express.Router();
/* GET home page. */
router.get('/', function(req, res, next) {
res.render('index', { title: 'Express' });
});
module.exports = router;
var express = require('express');
var router = express.Router();
/* GET users listing. */
router.get('/', function(req, res, next) {
res.send('respond with a resource');
});
module.exports = router;
node_modules
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var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');
var app = express();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');
app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use('/', indexRouter);
app.use('/users', usersRouter);
// catch 404 and forward to error handler
app.use(function(req, res, next) {
next(createError(404));
});
// error handler
app.use(function(err, req, res, next) {
// set locals, only providing error in development
res.locals.message = err.message;
res.locals.error = req.app.get('env') === 'development' ? err : {};
// render the error page
res.status(err.status || 500);
res.render('error');
});
module.exports = app;
#!/usr/bin/env node
/**
* Module dependencies.
*/
var app = require('../app');
var debug = require('debug')('express-demo:server');
var http = require('http');
/**
* Get port from environment and store in Express.
*/
var port = normalizePort(process.env.PORT || '3000');
app.set('port', port);
/**
* Create HTTP server.
*/
var server = http.createServer(app);
/**
* Listen on provided port, on all network interfaces.
*/
server.listen(port);
server.on('error', onError);
server.on('listening', onListening);
/**
* Normalize a port into a number, string, or false.
*/
function normalizePort(val) {
var port = parseInt(val, 10);
if (isNaN(port)) {
// named pipe
return val;
}
if (port >= 0) {
// port number
return port;
}
return false;
}
/**
* Event listener for HTTP server "error" event.
*/
function onError(error) {
if (error.syscall !== 'listen') {
throw error;
}
var bind = typeof port === 'string'
? 'Pipe ' + port
: 'Port ' + port;
// handle specific listen errors with friendly messages
switch (error.code) {
case 'EACCES':
console.error(bind + ' requires elevated privileges');
process.exit(1);
break;
case 'EADDRINUSE':
console.error(bind + ' is already in use');
process.exit(1);
break;
default:
throw error;
}
}
/**
* Event listener for HTTP server "listening" event.
*/
function onListening() {
var addr = server.address();
var bind = typeof addr === 'string'
? 'pipe ' + addr
: 'port ' + addr.port;
debug('Listening on ' + bind);
}
This diff is collapsed.
{
"name": "express-demo",
"version": "0.0.0",
"private": true,
"scripts": {
"start": "node ./bin/www",
"devstart": "nodemon ./bin/www"
},
"dependencies": {
"cookie-parser": "~1.4.3",
"debug": "~2.6.9",
"express": "~4.16.0",
"http-errors": "~1.6.2",
"morgan": "~1.9.0",
"pug": "2.0.0-beta11"
},
"devDependencies": {
"nodemon": "^1.18.9"
}
}
body {
padding: 50px;
font: 14px "Lucida Grande", Helvetica, Arial, sans-serif;
}
a {
color: #00B7FF;
}
var express = require('express');
var router = express.Router();
/* GET home page. */
router.get('/', function(req, res, next) {
res.render('index', { title: 'Express' });
});
module.exports = router;
var express = require('express');
var router = express.Router();
/* GET users listing. */
router.get('/languages', function(req, res, next) {
res.send('Go is soooo much better than Rust!');
});
module.exports = router;
var express = require('express');
var router = express.Router();
/* GET users listing. */
router.get('/', function(req, res, next) {
res.send('respond with a resource');
});
router.get('/hello-world', function(req, res, next) {
res.send('hello america!!!');
});
module.exports = router;
extends layout
block content
h1= message
h2= error.status
pre #{error.stack}
extends layout
block content
h1= title
p Welcome to #{title}
doctype html
html
head
title= title
link(rel='stylesheet', href='/stylesheets/style.css')
body
block content
# Steps to set-up express application locally
```npm install express-generator -g```
run `express --help`
run `express first-express-app --view=pug`
or for an api you can run the following:
`express first-express-api --no-view`
naviagte to our app `cd first-express-app`
and then run `npm install`
for windows run `SET DEBUG=express-locallibrary-tutorial:* & npm start`
for mac/linux run `DEBUG=express-locallibrary-tutorial:* npm start`
As an example let's run it without the debug statements and see the difference.
next execute `npm install --save-dev nodemon`
This is some sample text to illustrate the
difference between a synchronous and an asychronous file
read in javascript.
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var fs = require("fs");
// Asynchronous read
fs.readFile('input.txt', function (err, data) {
if (err) {
return console.error(err);
}
console.log("Asynchronous read: " + data.toString());
});
// Synchronous read
var data = fs.readFileSync('input.txt');
console.log("Synchronous read: " + data.toString());
console.log("Program Ended");
\ No newline at end of file
var fs = require("fs");
var buf = new Buffer(1024);
console.log("Going to open an existing file");
fs.open('input.txt', 'r+', function(err, fd) {
if (err) {
return console.error(err);
}
console.log("File opened successfully!");
console.log("Going to read the file");
fs.read(fd, buf, 0, buf.length, 0, function(err, bytes) {
if (err) {
console.log(err);
}
// Print only read bytes to avoid junk.
if(bytes > 0) {
console.log(buf.slice(0, bytes).toString());
}
// Close the opened file.
fs.close(fd, function(err) {
if (err) {
console.log(err);
}
console.log("File closed successfully.");
});
});
});
var http = require('http');
// Options to be used by request
var options = {
host: 'localhost',
port: '8081',
path: '/index.html'
};
// Callback function is used to deal with response
var callback = function(response) {
// Continuously update stream with data
var body = '';
response.on('data', function(data) {
body += data;
});
response.on('end', function() {
// Data received completely.
console.log(body);
});
}
// Make a request to the server
var req = http.request(options, callback);
req.end();
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<html>
<head>
<title>Test Page</title>
</head>
<body>
Welcome to 388b winter 2019!!!
</body>
</html>
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