Mittwoch, 18. Mai, 2016

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Delving into Node.js and Express web framework 30 1 var port = 1337; 2 var connect = require('connect'); 3 var app = connect(); 4 var logger = function(req, res, next) { 5 console.log(req.method, req.url); 6 next(); 7 }; 8 9 var howdyWorld= function(req, res, next) { 10 res.setHeader('Content-Type', 'text/plain'); 11 res.end('Howdy World'); 12 }; 13 14 app.use(logger); 15 app.use('/howdy', howdyWorld); 16 17 app.listen(port); 18 console.log('Server running at http://localhost:' + port); The logger() middleware uses the console.log() method to log the method and url of the request (req variable) out to the console. The logger() middleware is registered before the howdyWorld() middleware because that determines the order in which each middlewares are executed. Another thing to notice is the next() call in the logger() middleware, which then calls the howdyWorld() middleware. Removing the next() call would stop the execution of middleware function at the logger() middleware, which would in turn mean that the request would hang forever as the response would never end by calling the res.end() method. Finally, the howdyWorld() middleware is bound to respond only to requests made to the /howdy path. Express Since Connect module is open source, it can be extended and one (yeah, you heard that right - one, uno, jedan, ein) developer named TJ Holowaychuk did it better than most when he released a Connect-based web framework known as Express⁷⁷. I’ll summarize TJ Holowaychuk like this: ⁷⁷http://expressjs.com
Delving into Node.js and Express web framework 31 legend He has more than 500 open source projects⁷⁸, people even ask how does he do it⁷⁹, anyways as the image suggest - a legend. Ok, enough praise, let’s move on fellow mortals… Express is built on top of Connect and it uses its middleware architecture. It extends Connect to allow a variety of common web application use cases: • HTML template engines • various data format outputs • routing system, etc Now, some action! Lets start a new project by making a new directory and running npm init command in it. After filling some basic information about your application (when it asks you for a entry point, enter server.js instead of default index.js), let’s install express by running: 1 $ npm install express --save As you may remember from the first post, the –save switch saves the module dependency in your package.json file which was created with the npm init command. Now, create a file named server.js and copy/paste the following content in it: ⁷⁸https://github.com/tj ⁷⁹http://www.quora.com/How-is-TJ-Holowaychuk-so-insanely-productive
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Mittwoch, 18. Mai, 2016

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