Make your app handle going offline

In plain words

Offline.js is a JavaScript and CSS library that automatically notifies users when their internet connection is lost. It captures failed AJAX requests made while offline and resends them once connectivity returns, ensuring the app functions smoothly without interruption. The library includes multiple built-in themes and requires minimal setup to implement.

written from the facts on this page · September 2026

From the sources

Offline.js is a library to automatically alert your users when they've lost internet connectivity, like Gmail. It captures AJAX requests which were made while the connection was down, and remakes them when it's back up, so your app reacts perfectly. It has a number of beautiful themes and requires no configuration. Click Install to see a live preview of Offline on yourfrom github.hubspot.com

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