JavaScript is one of the most important technologies on the modern web. It makes websites interactive, powers web applications, and is used for menus, forms, dashboards, maps, chats, editors, and many other features.
At the same time, JavaScript also raises security, privacy, and software freedom questions. This topic is often discussed in the free software community, including by Richard Stallman and the GNU Project. gnu.org/philosophy/javascript-trap..
What is JavaScript used for?
JavaScript runs inside the web browser. It can be used for:
- Interactive menus and buttons
- Form validation
- Live search and filtering
- Webmail interfaces
- Admin dashboards
- Chat and notification systems
- Modern web applications
The Security Side
JavaScript is not automatically dangerous. Modern browsers isolate websites from each other using security mechanisms such as the same-origin policy and sandboxing.
However, JavaScript can become a risk when:
- A website is compromised
- Untrusted third-party scripts are loaded
- A site has XSS vulnerabilities
- Tracking scripts