I lost hours debugging a Next.js 16 caching issue that had no error, no warning, and only showed up in production.
The Next.js 16 caching model is...
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Thank you for sharing your experience about caching! 😄
In my case, a tester reported that the code had a bug. I checked many times but couldn’t find it. In the end, we found that caching was causing the issue. Caching is hard to handle. 😅
That's exactly how these bugs feel. Everything looks correct, you check the logic multiple times, and the actual problem is invisible because it's in the caching layer not the code itself.
The worst part is there's usually no error pointing you there. You only figure it out after ruling out everything else.
Glad a tester caught it before it went further though. A lot of these slip through to production unnoticed.
Yes, it’s easy if caches are visible, but they’re usually too invisible to notice. 😵💫
Exactly, that invisibility is what makes it so tricky to debug.
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This is the kind of bug category that scares me more than obvious build errors. Caching issues are painful because everything looks fine locally, the app compiles, and then production starts serving stale data or skipping updates in ways that are hard to trace. The biggest lesson is probably not to treat caching as a default performance boost. It needs clear rules, testing, and visibility, especially in Next.js where one wrong assumption can quietly break the user flow.
Yeah, these are the ones that stick with you because nothing clearly breaks. Everything looks correct until it isn’t.
The point about not treating caching as a default performance boost really stands out. In Next.js 16 it’s opt-in, but a lot of issues come from assumptions carried over from earlier versions. That mismatch is where things start behaving in unexpected ways.
Visibility and clear rules around caching make a huge difference here.
Exactly. These bugs are painful because they create false confidence. The app builds, local testing passes, and nothing looks broken until real users hit stale or inconsistent data. That’s why caching needs the same discipline as auth or payments. Clear rules, test cases, and visibility before it becomes a production mystery.
@shubhradev silent failure is the worst part. On a migration I lost an afternoon because dev was fine and prod skipped revalidation on one segment. Hitting the route twice and diffing was the cheapest guardrail.
Sorry if my English sounds weird!!
Yeah that’s exactly the kind of bug I was running into too. Dev looks completely fine, then production behaves differently with no signal at all.
Hitting the route twice and diffing is actually a really smart and simple guardrail. I ended up doing similar things just to confirm whether caching was actually working or not.
And your English is perfectly clear, no worries at all 🙂
Just wondering - did you ever hear about RedwoodSDK?
rwsdk.com/
It's a "competitor" to Next.js and TanStack Start - interesting and elegant concepts, but the big "catch" is that it's pretty tightly tied to CloudFlare ...
Other drawback might be that it's currently very "niche", with a small community - I honestly think they should start marketing it better (or they're just going to get themselves acquired by CloudFlare, which might in fact be the "real" underlying reason why they tied their framework so closely to CF, lol) ...
On the other hand there's of course TanStack Start, which also advertises itself as "less hidden magic" compared to Next.js ... I think both frameworks (RedwoodSDK and TanStack Start) pride themselves in being "easier to understand and debug" than Next.js.
(and all three support RSCs)
I haven't used RedwoodSDK in production yet, but the Cloudflare lock-in does feel like a real tradeoff for most teams.
TanStack Start is interesting too. The "less hidden magic" direction is appealing, especially if you've spent time debugging things that aren't obvious in Next.js.
It's actually interesting that Next.js 16 is moving in a similar direction with more explicit caching. The challenge is just the transition period where the old mental model no longer applies, and things can break in ways that aren't immediately visible.
That's really where most of the issues I mentioned in the post come from.
Curious if you've tried either of them in production?
Not yet, and I don't know if I could honestly recommend RedwoodSDK, it seems to have so little traction yet, and then the heavy vendor lock-in - I think it probably needs a bit more time to see where it goes ...
TanStack however seems to have a lot of momentum these days ...
Yeah that makes sense. RedwoodSDK feels a bit early right now, especially with the Cloudflare dependency. It is interesting technically, but for most teams the lock-in and smaller ecosystem are real considerations.
TanStack Start does feel like it is gaining momentum though. The focus on making things more explicit and easier to reason about is a big plus, especially after dealing with the kind of invisible failure modes that come up in Next.js.
I think that is where things are heading overall. Less hidden magic, more predictable behavior. Next.js 16 is moving in that direction too, but the transition phase is where most of the confusion comes from.