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Should JavaScript be in a separate file?
You should put your JS code in a separate file because this makes it easier to test and develop. The question of how you serve the code is a different matter. Serving the HTML and the JS separately has the advantage that a client can cache the JS.
Can JavaScript be secure?
From a security perspective, JavaScript is fourth on the list of the most vulnerable languages – only behind Java, PHP, and C. For this reason, developers must remain proactive and defensive in securing their JavaScript applications to keep the web safe.
Can you link JavaScript files?
To include an external JavaScript file, we can use the script tag with the attribute src . You’ve already used the src attribute when using images. The value for the src attribute should be the path to your JavaScript file.
Why do we have to separate the JS file from HTML?
It separates HTML and code. It makes HTML and JavaScript easier to read and maintain. Cached JavaScript files can speed up page loads.
Why is it important to protect client side JavaScript?
Just like anyone can use the debugging tool for legitimate purposes, an attacker can use this feature to change JavaScript at runtime. The attacker can hit a breakpoint, change the DOM and enter arbitrary JavaScript in the console. This kind of attack can be used to exploit possible security flaws on the client-side.
How to protect the source of a JavaScript file?
For example, if your page is written in php, you can include the script via the include function and let the script decide if it’s safe ” to return it’s source. that would be included in your main page my-page.php : This way, only the browser could see the js file contents.
What happens if I password protect my JavaScript files?
If the browser has access, then browser’s user also has access. If you password protect your JS files, then the browser won’t be able to access them, defeating the purpose of having JS in the first place. Forget it, this is not doable. No matter what you try it will not work.
What are the dangers of JavaScript in the browser?
Going beyond the security risks of attackers targeting the JavaScript source code itself, we must still consider the dangers of arbitrary JavaScript execution in the browser. We have been seeing a growing surge of web supply chain attacks such as Magecart attacks flooding the web and leveraging the client-side to exfiltrate data.