Hello World HTTP Server
Counter
Hello World Module
Parse Log File
Express Framework
Using Forever
Forever commands
Nginx Server Block
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Learning Node.JS Programming
- http://jothut.com/cgi-bin/junco.pl/tag/nodejs
- http://jothut.com/cgi-bin/junco.pl/b/17499/NodeJS-for-newbies
- http://nodejs.org
- https://www.npmjs.org
- http://nodejs.org/docs/v0.4.11/api/http.html#http.request
- http://package.json.nodejitsu.com
- http://inessential.com/2013/12/09/getting_started_with_node_js_for_cocoa_
- http://inessential.com/2013/12/09/getting_started_with_web_services_using_
- http://expressjs.com/4x/api.html
- http://howtonode.org/hello-node
- http://www.2ality.com/2011/12/nodejs-shell-scripting.html
- http://www.theprojectspot.com/tutorial-post/Node-js-for-beginners-part-1-hello-world/2
- http://www.theprojectspot.com/tutorial-post/nodejs-for-beginners-callbacks/4
- http://nodeguide.com/beginner.html
- http://blog.modulus.io/absolute-beginners-guide-to-nodejs
Hello World at Command Prompt
Open up a text file and enter:
// Call the console.log function.
console.log("Hello World");
Save file as hello-console.js and then at the command prompt, execute:
node hello-console.js
Obviously, that produces:
Hello World
Hello World HTTP Server
Add the following code to a file called:
hello-server.js
// Load the http module to create an http server.
var http = require('http');
// Configure our HTTP server to respond with Hello World to all requests.
var server = http.createServer(function (request, response) {
response.writeHead(200, {"Content-Type": "text/plain"});
response.end("Hello World\n");
});
// Listen on port 8080, IP defaults to 127.0.0.1
server.listen(8080);
// Put a friendly message on the terminal
console.log("Server running at http://127.0.0.1:8080/");
Execute the code with:
node hello-server.js
The following message will be displayed to the console:
Server running at http://127.0.0.1:8080/
Point the browser to the domain/sub domain of the server with the port included. Example:
http://nodejs.soupmode.com:8080
If running the server and the browser on the same machine, use:
http://localhost:8080
If the above server code is running, then the following will be displayed in the browser:
Hello World
To stop this server app, hit Ctrl-C
at the command prompt.
Counter
Add the following code to counter.js
var http = require('http');
var userCount = 0;
http.createServer(function (request, response) {
console.log('New connection');
userCount++;
response.writeHead(200, {'Content-Type': 'text/plain'});
response.write('Hello!\n');
response.write('We have had '+userCount+' visits!\n');
response.end();
}).listen(8080);
console.log('Server started');
Execute the code with:
node counter.js
The message displayed to the console will say:
Server started
When accessing the server at port 8080 in the browser, the following will be displayed to the browser:
Hello!
We have had 1 visits!
Back at the server, the console display will say:
New connection
New connection
A refresh on the browser will cause the following message to be sent by the counter.js app:
Hello!
We have had 3 visits!
The counter increments by two.
Explanation from the article :
Note: You might see the counter going up by two for each request, this is because your browser is requesting the favicon from the server (http://localhost:8080/favicon.ico).
You should also see that Node.js is logging each request it receives to the console.
The main thing we're doing here is setting a 'userCount' variable and incrementing on each request. We're then writing the 'userCount' in the response text.
Hello World Module
http://nodeguide.com/beginner.html
Create the file main.js
with the following code:
var hello = require('./hello');
hello.world();
In the same directory, create another file called hello.js
with the following code:
exports.world = function() {
console.log('Hello World');
}
Execute at the command prompt:
node main.js
The console will display the following:
Hello World
Parse Log File
http://blog.modulus.io/absolute-beginners-guide-to-nodejs
Express Framework
http://blog.modulus.io/absolute-beginners-guide-to-nodejs
npm install express
file: static-file-server.js
code:
var express = require('express'),
app = express();
app.use(express.static(__dirname + '/public'));
app.listen(8080);
execute: node static-file-server.js
Using Forever
Running a Node.js app as daemon.
The purpose of Forever is to keep a child process (such as your node.js web server) running continuously and automatically restart it when it exits unexpectedly.
I made a change to my Ghost blog installation config file. I killed the Ghost index.js process. When I did, it automatically restarted and loaded the new config settings.
http://stackoverflow.com/questions/4018154/node-js-as-a-background-service
https://www.npmjs.org/package/forever
http://blog.nodejitsu.com/keep-a-nodejs-server-up-with-forever
https://github.com/nodejitsu/forever
$ npm install forever
$ forever start /home/nodejs/counter.js
Forever commands
usage: forever [start | stop | stopall | list] [options] SCRIPT [script options]
options:
start start SCRIPT as a daemon
stop stop the daemon SCRIPT
stopall stop all running forever scripts
list list all running forever scripts
Nginx Server Block
$ cd /etc/nginx/sites-available
$ vim nodejs.yoursite.com
The server block file:
server {
listen 80;
server_name nodejs.yoursite.com;
location / {
proxy_pass http://nodejs.yoursite.com:8080;
}
}
$ service restart nginx
In browser, access: http://nodejs.yoursite.com
Each refresh will update the counter. Should see something like this:
Hello!
We have had 18 visits!
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