In practice, it is impossible to hide the Javascript code from the source code, because the Javascript code is downloaded to the client browser in clear text and is executed completed by the browser.
As a result in this article, I will share with you a few methods to hinder and make it difficult to read the javascript source code:
Obfuscate the javascript code
Obfuscation is a technique that changes the code structure to make it harder to understand. For example, variable names can be replaced with random characters or strings. This makes the code harder to read and understand, as said earlier it doesn't provide complete protection.
There are tools available online to obfuscate the javascript code, such as JS-Obfuscator.com
Server Side Rendering
To maintain the security and privacy of sensitive code, it is important to execute computations on the server side rather than the client side. This approach is commonly used in various web applications, particularly those that handle confidential data such as online banking applications. By performing the computations on the server side, the sensitive code is kept hidden from the client side, thus reducing the risk of unauthorized access, tampering, or theft.
In executing computations on the server side, the web application works by sending a request from the client side to the server side, which then processes the request and sends the result back to the client side. This approach ensures that the sensitive code is never exposed to the client side, which may be vulnerable to hacking or other security breaches.
Moreover, the server-side processing of computations offers several benefits, such as faster performance, enhanced scalability, and efficient use of resources. Since the server side can handle multiple requests simultaneously, it can provide faster response times and a better user experience. Additionally, the server-side can efficiently manage the computational resources, ensuring that the application can handle large volumes of data and users without compromising performance.
Taking note of all these benefits, developers need to consider the server-side approach when building web applications that handle confidential data.
Javascript minification
Minification is a process that involves optimizing the code by removing unnecessary characters such as white spaces, and comments, and shortening variable names. It is a technique that is commonly used to reduce the amount of data that needs to be sent over the internet, which in turn speeds up the loading time of web pages.
During the minification process, the code is stripped of all extraneous characters to make it as compact as possible. This is achieved by removing all spaces, tabs, and line breaks from the code. Additionally, all comments are removed from the code, as well as any code that is not necessary for the functioning of the program.
Although minification makes the code smaller and harder to read, it is still possible to understand the code if someone is determined to do so. However, the primary objective of minification is to optimize the code and reduce the amount of data that needs to be transmitted. This, in turn, helps to speed up the loading time of web pages, resulting in a better user experience for website visitors.
Disabling the right mouse click
One method to prevent users from accessing the context menu, which includes options such as viewing source, inspecting elements, and saving images, is by disabling right-clicking through event listeners or CSS properties. However, this approach is not entirely effective in hiding code, as users can still access the source code using keyboard shortcuts or browser tools.
Here's how to disable the right mouse click in javascript,
document.addEventListener('contextmenu', event => event.preventDefault());
Note: You should not disable the right click as it makes the website less accessible resulting bad User Experience.
Conclusion
In conclusion, while it is impossible to completely hide Javascript code from the source code, several methods can be used to make it more difficult to read and understand. Obfuscation, server-side rendering, Javascript minification, and disabling the right mouse click are some of the techniques that can be used to protect sensitive code.
However, it is important to note that these methods are not foolproof and determined individuals can still access the code if they are motivated enough. Therefore, developers must implement multiple layers of security to protect their code and ensure the safety of their web applications.
