Mastering Sling Filters in AEM

[#1]

Mastering Sling Filters in AEM

By Neeraj Chaudhary

Imagine you’re entering a building (your AEM website), and there’s a security guard at the entrance. Before you walk in, the guard can:

• Check your ID (authentication)
• Tell you to go to a different entrance (redirect)
• Make a note of who entered (logging)
• Ask you to wear a mask (set headers)

A Sling Filter works just like that security guard. It checks and sometimes modifies the request before it reaches your actual AEM page or component. It can also update the response before it’s returned to the user.

In short: Sling Filters sit in the middle of every request and response, letting you add custom logic like checking, blocking, redirecting, or modifying content.

In this blog, we’ll explore Sling Filters, how they work, their real-world use cases, and how to implement them efficiently.

Full Article

Read the full article at https://medium.com/@neerajchaudhary856/mastering-sling-filters-in-aem-f9fb709bcc27

Q&A

Please use this thread to ask questions relating to this article

[#2]

Nice article @chaudharynick 

[#3]

@chaudharynick Thanks Neeraj for breaking down Sling Filters with such a simple analogy - the security guard example really makes it click. One thing I would like to ask: in real-world projects, how do you usually decide whether to implement logic inside a Sling Filter versus handling it through an OSGi service or Dispatcher rules? Would love to hear how you make that trade-off.