Executive Summary
Vercel has launched a new cache tagging feature for its Functions, allowing developers to associate tags with cached responses for more precise control. This enables targeted invalidation of specific cached content through multiple interfaces, including the Vercel Dashboard, CLI, and APIs. The feature is designed to improve cache management and is now available across all plans and frameworks.
Key Takeaways
* New Capability: Developers can now add one or more cache tags to a Function's response by importing and using the `addCacheTag` function from the `@vercel/functions` package.
* Granular Invalidation: Cache can be invalidated by its associated tag, offering more precise control over data freshness compared to broad cache purges.
* Multiple Invalidation Methods: Tag-based invalidation can be triggered via the Vercel Dashboard, CLI, a Function API, and the REST API.
* "Dangerous Delete" Option: A "delete by tag" option is available for situations where the origin is gone, but Vercel advises caution as it can increase latency or cause downtime.
* Universal Availability: The cache tagging feature is immediately available on all Vercel plans and is compatible with all supported frameworks.
Strategic Importance
This feature provides developers with a critical tool for managing dynamic content at the edge, enhancing application performance and data consistency without requiring disruptive, full-site cache clears.