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Web Locks API Demo - Online Resource Coordination

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Web Locks API Demo Online Resource Coordination

Experience how the Web Locks API helps coordinate shared resources across tabs, windows, and workers — right in your browser.

Your browser does not support the Web Locks API. Please use Chrome 69+, Edge 79+, Firefox 96+, or Safari 15.4+.

Shared Resource: Counter

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Only one client can increment at a time – protected by a lock named 'my-shared-counter'.

Fast Slow 1000 ms

No virtual clients yet. Add one to start testing the Web Locks API.

Frequently Asked Questions

The Web Locks API enables scripts running in multiple tabs, workers, or windows to coordinate access to shared resources. It provides explicit lock management (request, wait, release) to prevent race conditions without complex synchronization code.

Chrome (69+), Edge (79+), Firefox (96+), and Safari (15.4+) all support the Web Locks API. Internet Explorer and older browsers do not.

A lock ensures that only one script at a time can enter a critical section. Other callers are queued until the lock is released. This prevents simultaneous reads/writes that would corrupt shared data like IndexedDB, localStorage, or server-side resources.

A lock name is an arbitrary string that identifies the resource being protected. Multiple tabs can request the same lock name, ensuring they coordinate. In this demo, the lock name is 'my-shared-counter'.

Yes! Combining Web Locks with IndexedDB transactions is a powerful pattern. You can acquire a lock before performing a read-modify-write cycle to avoid conflicting writes from different tabs.

The Web Locks API automatically releases locks held by a closing tab or dead worker. This prevents permanent deadlocks and keeps the system resilient.
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