This way hackers cant inject arbitrary codes. This overrides the eval(), which when invoked it throws an error. Throw new Error("HAHAHA!!! GOTCHA HACKERS.") * Save a reference or cache the eval function if you want to use it inside your IIFE ALL CODES CAN RUN.Įxample Usage: eval("setInterval(function(), 1000/60)") eval() allows strings which is an arbitrary code to be executed as a JS code. You can add an if block to check whether the function is configurable Not all JS environments support overriding native functions. When someone will call document.write and document.writeIn, nothing happens.
We redefined the get property of methods “write” and “writeIn” from document with a NOOP function. Re-define document.write & document.writeIn The Patch // Starts with IIFE (Immediately Invoked Function Expression) Also, this function can be seen on hacking scripts.
It may overwrites the content of the page. Patch document.write() & document.writeIn() NOTE: All of my tips shared dont adhere’s some natural JS Standards.ġa. In addition, here are the JS tips I can share with you. If you need to store or transfer data from a central system, always make sure that you’re implementing security checks like authentication and validation on the server side because you can never be sure that the data sent by clients is safe and clean. You can’t control software running on client devices. But entirely blocking them is impossible because you don’t control the browser. Maybe you can use Javascript to detect Tampermonkey hooks and disable, block or sabotage them. You can’t control the runtime environment, which means you can’t control how your code is executed. In the end, the server sends data to the visitor’s browser, which is then rendered in the browser of the visitor on the device of the visitor. The short answer is: you can’t completely. Userscripts are small computer programs that change the layout of a page, add or remove new functionality and content, or automate actions. Tampermonkey is used to run so-called userscripts (sometimes also called Greasemonkey scripts) on websites. Just for those unfamiliar with this Tampermonkey script:
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