How Can Google Caja Securely Sandbox JavaScript in the Browser?

Implementing JavaScript Sandboxing in the Browser

It's essential to sandbox JavaScript running in the browser to restrict access to features typically accessible to JavaScript code within an HTML page.

Consider a scenario where you want to provide an API for end users to define event handlers for "interesting events." However, you need to prevent these users from accessing properties and functions of the window object.

Conventional approaches like redefining window.alert globally or sending event handler code to the server can be impractical.

To resolve this challenge, consider leveraging Google Caja. It's a source-to-source translator that isolates untrusted third-party HTML and JavaScript code within your page, ensuring security. Caja achieves this by translating the code into a safe subset of JavaScript that can only access a restricted set of functions and objects.

In essence, Google Caja effectively creates a sandboxed environment for JavaScript execution, allowing you to provide a secure API for your users while maintaining control over the underlying environment.

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