JS Injector is a free Chrome extension developed by Joey. It falls under the category of Browsers and is listed as an Add-ons & Tools subcategory. This handy tool allows users to automate testing and auto-populate forms by injecting JavaScript code and open source libraries directly into web pages.

With JS Injector, users can easily streamline their testing process by injecting JavaScript code into web pages. This enables them to automate various tasks and interactions, making the testing process more efficient and accurate. Additionally, the extension allows users to populate forms automatically, reducing the time and effort required to fill in repetitive form fields.

One notable feature of JS Injector is the option to run injected scripts in isolation. When the "Run in isolation" checkbox is selected, the injected script will not contaminate the original code of the web page. This ensures that the injected code only affects the specific tasks at hand without interfering with the overall functionality of the page.

JS Injector is a valuable tool for developers, QA testers, and anyone involved in web testing and form population. Its ability to automate testing and form filling tasks makes it a time-saving and efficient solution for various scenarios.