Web development is a very broad topic. Things like angular js are  for the 
browser on the client-side, but always rely on another server back-end 
framework to process HTTP requests. These frameworks can be written in 
almost any language, popular ones are Java, Ruby, .NET, node.js, PHP, etc. 
You cannot necessarily detect what any particular site is using as their 
back-end. 

If you are new to web development, I would start by picking and learning a 
few server-side frameworks. If you are already familiar with javascript 
development you might look at something like http://expressjs.com/

Helping you more than this is would not really be appropriate for this 
forum. However,  there are many communities, blogs, forums, and books that 
can help guide you, once you once you've picked a framework.


On Friday, December 27, 2013 12:47:46 AM UTC-8, Raf Roger wrote:
>
> Hi,
>
> i'm new to javascript frameworks and i would like to understand how it 
> works for back end.
> in fact i would like to do a web portal and as we know javascript is not 
> secured enough to process data with Database and therefore hackers could do 
> bad thing with data reading code.
>
> 1. therefore, i would like to understand how web portals using javascript 
> frameworks communicate with back end (MySQL) ?
> 2. if we take example like www.freelancer.com that use several javascript 
> frameworks, how data are stored in database ? Wappalyzer doesn't detect any 
> PHP script on backend side, so how does it work ?
> 3. Moreover how the payment gateway is done ? which programming language ?
>
> thanks a lot.
>

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