Next.js Cache Debugger and Migration Toolkit
Next.js 16 introduced a new caching model ('use cache' directive) that compiles fine but fails silently in production. Missing cacheTag calls, deprecated revalidateTag usage, and misplaced directives are invisible during development. A debugger toolkit that surfaces cache misses, invalidation errors, and placement issues during dev prevents production outages caused by caching bugs.
Problem Statement
A team migrating from Next.js 15 to 16 adds 'use cache' directives to their data fetching functions. Everything compiles and passes tests. In production, they discover that 3 functions are not caching because cacheTag was missing, one function caches the wrong component because the directive was placed on a wrapper instead of the data function, and revalidation silently fails because they used the old API signature. Total debugging time: 2 full engineering days.
The Idea
A Next.js 16 cache debugging toolkit for React developers who need visibility into the new caching model before deploying to production.
Why Now
Next.js 16 shipped with a fundamentally different caching model in early 2026. Thousands of teams are migrating from Next.js 14/15's caching behavior. The new 'use cache' directive has at least 7 known silent failure modes that compile without errors. Vercel has not shipped a debugging tool for the new model, leaving developers to discover bugs in production.
Target User
React/Next.js developers migrating to or building on Next.js 16 who need cache behavior visibility
Target Market
Next.js developer tooling and debugging
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