JavaScript is a popular programming language used by most websites. On an iPhone, JavaScript should be turned on by default, but if it was disabled at some point, many websites will appear broken in the Safari browser.

Is JavaScript safe on iPhone?

Despite the name's similarity to Java (a platform-independent programming language), JavaScript is OK – with the small caveat that malicious or even poorly written JavaScript code can still cause your browser to appear unresponsive. Other than that JavaScript can't cause any permanent harm and it's perfectly OK to use.

What does JavaScript do on iPhone?

Learn how to allow or block the JavaScript execution on the Apple Safari browser for the iPhone or iPad. JavaScript is used to make the website interactive. All the major websites built these days somehow rely on JavaScript. JavaScript adds an interactive element that is not available in older web technology.