Inject JS - Run JavaScript code
Inject js on any website Run JavaScript code
Inject, tweak, and customize JavaScript on any website with a powerful Monaco-powered editor.
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TamperJS is a lightweight and efficient browser extension designed for developers who need a quick and seamless way to inject custom JavaScript into any website. Built with the Monaco Editor—the same technology behind VS Code—it provides a clean and intuitive environment for writing, testing, and executing scripts effortlessly.
Whether you're a developer optimizing workflows, a researcher testing scripts, or a power user customizing web pages, TamperJS provides an easy-to-use interface with domain-based script management, instant execution, and a seamless dark mode for a comfortable coding experience.
Our goal is to keep things simple yet effective, helping you customize the web in a way that suits your needs.
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Inject js on any website Run JavaScript code
Inject custom JavaScript (JS) into any webpage, automate tasks, and manage scripts. Ideal for developers and power users.
Disable JavaScript on any site in one click
Rule the web your way — feature-rich userscript manager to customize, automate, and dominate every site with ease.