How do you export a DurableObject in a Next.js app using OpenNext on Workers?

TTyveris With hibernation, do you pay for those 1-2 min?

If you refer to websocket hibernation, then no, you do not pay for duration once the DO is hibernated.
Note that if you use your DO will NOT hibernate regardles if you are using websocket hibernation, hence you will be charged for duration in that case.

Tero•5/6/25, 7:48 PM

are there any disturbances with durable objects? One of objects started throwing errors when opening websockets at 18:30 UTC and it still continues. Other instances work fine. All calls to open a websocket end in a error with some internal code, for example:

jcheese•5/6/25, 9:34 PM

Somehow DO alarms get called everytime i refresh the static page

Jjcheese Somehow DO alarms get called everytime i refresh the static page

Milan•5/6/25, 9:45 PM

Hmm, are you maybe setting the alarm to run in the constructor? Alternatively, are you calling the

alarm()

alarm()

handler directly somewhere in your DO code?

Original message was deleted

Hard@Work•5/6/25, 11:48 PM

Not natively, though you should be able to dump the SQL manually

plgingras88•5/6/25, 11:55 PM

I must admit I am still amazed this is not the #1 priority and next feature for DO (I mean native backup/restore procedures through a R2 integration or else).

Pplgingras88 I must admit I am still amazed this is not the #1 priority and next feature for ...

gruntlord6•5/7/25, 2:53 AM

you can use this at least
durable-objects

gruntlord6•5/7/25, 2:54 AM

otherwise you could have it write to d1 and use d1s dump feature

Alex•5/7/25, 8:46 AM

I get DO's that get stuck in an loop. https://screen.bouma.link/r7vljp4v2bMkNb5vJjlT
This has been reported long time ago and marked as resolved but it doesn't look resolved for me: https://github.com/cloudflare/workerd/issues/2993#issuecomment-2801468494

I have tried emptying the handler and wrapping all it's code in a try/catch. But I don't think I am going to get to the bottom of this without some help

Silvan•5/7/25, 3:14 PM

my assumption is still that the outerbase people are cooking something cool in regards of DO storage

Sstochastic How do you export a DurableObject in a Next.js app using OpenNext on Workers?

stochasticOP•5/7/25, 3:22 PM

Is this just impossible?

ac•5/7/25, 3:29 PM

Is this still an issue that's somehow hidden now? I don't have Smart placement turned on (it's on "default") but I am still getting this error when I should not be. https://community.cloudflare.com/t/smart-placement-breaks-durable-object-rpc/654797

Sstochastic Is this just impossible?

Silvan•5/7/25, 4:05 PM

not impossible but not recommended anyway workers-and-pages-discussions

Silvan•5/7/25, 4:06 PM

but it would require you to change the built code

SSilvan but it would require you to change the built code

stochasticOP•5/7/25, 4:54 PM

Thanks! Makes sense.

formatc2013•5/7/25, 5:55 PM

Hi

In WSL open devtools does not pop up anything, other commands work fine.
Did anyone run into this?

Sstochastic Thanks! Makes sense.

gruntlord6•5/7/25, 6:04 PM

I use Durable Objects in remix and I made it so there is a backend worker handling the Durable Object for each customer (they get a unique instance each), and the remix app uses RPC to interface with the worker

Ggruntlord6 I use Durable Objects in remix and I made it so there is a backend worker handli...

Silvan•5/7/25, 7:50 PM

out of curiosity. can you use

using

using

or Symbol.dipose in remix to dispose the rpc stub?

SSilvan out of curiosity. can you use `using` or [Symbol.dipose]() in remix to dispose t...

gruntlord6•5/7/25, 7:52 PM

dispose the stub?

Ggruntlord6 dispose the stub?

Silvan•5/7/25, 7:54 PM

https://developers.cloudflare.com/workers/runtime-apis/rpc/lifecycle/#explicit-resource-management

Cloudflare Docs

Lifecycle

Memory management, resource management, and the lifecycle of RPC stubs.

gruntlord6•5/7/25, 7:54 PM

I don't explicitly manage it because the durable object runs on alarms until it completes the queued work

gruntlord6•5/7/25, 7:55 PM

generally it could be as few as one task to tens of thousands, and remix is not designed for managing that nor would it really make sense given the context

Silvan•5/7/25, 9:07 PM

well its still good practice and sadly dosent really work in that environment

SSilvan well its still good practice and sadly dosent really work in that environment

gruntlord6•5/8/25, 1:14 AM

likely, but we only use the RPC to initiate the worker so we end the context very quickly and the documentation says that automatically disposes of it

gruntlord6•5/8/25, 1:15 AM

doing it cleanly is always ideal, but using remix with bindings wasn't super well documentated from what I could find

gruntlord6•5/8/25, 1:15 AM

I'd love if cloudflare had official demos for these platforms with remix next js etc, showing basic things like database bindings, r2 access etc

Fernando Barroso•5/8/25, 2:21 PM

Hey all! Do you know of any observability service that could show spans across a worker and a DO? I know baselime used to be the best option in past but idk what the latest is on that since acquisition.

Alex•5/8/25, 2:28 PM

I have not tried it but I do know Sentry recently released DO support which looks like it supports connected traces: https://github.com/getsentry/sentry-javascript/pull/16180

Fernando Barroso•5/8/25, 4:46 PM

This is coool!

CiRCUiT•5/9/25, 11:44 AM

I'm using Vercel's AI SDK, specifically the streamText function along with createDataStreamResponse, to send custom streaming data. I'd like to integrate this with a Cloudflare WebSocket setup using Durable Objects. What would be the best approach to achieve this integration?

Coshmar Tabletowy V•5/9/25, 12:32 PM

Hi all, whenever I try to write to Durable Object I have in live preview of the logs:

"executionModel": "durableObject", "outcome": "canceled",

Coshmar Tabletowy V•5/9/25, 12:32 PM

Is there any way to get the information why?

Elliot Hesp•5/9/25, 1:40 PM

Hey,

I believe I've found a prod vs local discrepancy with Durable Objects - where would I go about reporting this?

EElliot Hesp Hey, I believe I've found a prod vs local discrepancy with Durable Objects - wh...

lambrospetrou•5/9/25, 3:15 PM

Create a github issue in the wrangler repo if by local you mean

wrangler

wrangler

: https://github.com/cloudflare/workers-sdk/

Elliot Hesp•5/9/25, 3:15 PM

Thanks - well actually things work as expected locally, just not in prod

EElliot Hesp Thanks - well actually things work as expected locally, just not in prod

lambrospetrou•5/9/25, 3:24 PM

Describe the issue here, then. Without knowing what the discrepancy is I can't help.

Elliot Hesp•5/9/25, 3:32 PM

Ok so it does trigger in production

I think some code is erroring but I've no idea where logs are if an alarm throws an error

EElliot Hesp Ok so it does trigger in production 😮‍💨 I think some code is erroring but I've...

lambrospetrou•5/9/25, 3:39 PM

You can enable Observability logs for your worker project and you will be able to see your logs in the cloudflare dashboard. https://developers.cloudflare.com/workers/observability/logs/workers-logs/#enable-workers-logs

Elliot Hesp•5/9/25, 3:43 PM

Hmm, I do have that enabled, but I've just seen what's happening:

I have an endpoint setup which I am calling which accesses the DO (to logs the alarm)
If I don't call this endpoint, the alarm doesn't trigger
If I then call the endpoint, the alarm triggers - so accessing the DO seems to kick it off

Elliot Hesp•5/9/25, 3:43 PM

And I can see the RPC call which kicks it off includes the logs of the alarm call

EElliot Hesp Hmm, I do have that enabled, but I've just seen what's happening: - I have an e...

Milan•5/9/25, 4:14 PM

Maybe this? durable-objects

Elliot Hesp•5/9/25, 4:19 PM

@lambrospetrou @Milan

Ok so finally figured it out, I think:

My alarm calls a function

await doSomething()

await doSomething()

which is outside of the class (import function) which does an external async fetch call.

If that function thows an error (e.g.

if (!res.ok) throw new Error()

if (!res.ok) throw new Error()

) then the alarm just dies and no logs appear in console (hence me thinking it wasn't being triggered)

If I catch the error inline within the alarm

await doSomething().catch(e => console.error(e))

await doSomething().catch(e => console.error(e))

and return early, the alarm logs show up

So my issue was that I didn't think the alarm was being triggered because the alarm swallowed the errors/logs

EElliot Hesp @lambrospetrou @Milan Ok so finally figured it out, I think: My alarm calls a...

lambrospetrou•5/9/25, 4:24 PM

Yeah, as a guideline anything you do inside the

alarm()

alarm()

handler should be wrapped in a try-catch.

Elliot Hesp•5/9/25, 8:44 PM

Ok I've boiled the issue down to the following:

    this.ctx.blockConcurrencyWhile(async () => {
      await this.migrate();
    });

    this.ctx.blockConcurrencyWhile(async () => {
      await this.migrate();
    });

This is taken from; https://orm.drizzle.team/docs/connect-cloudflare-do

Seems like when the alarm tries to init the DO, it just explodes for some reason trying to the migration

Drizzle ORM - Cloudflare Durable Objects

Drizzle ORM is a lightweight and performant TypeScript ORM with developer experience in mind.

Elliot Hesp•5/9/25, 8:46 PM

The above was just a red herring it seems

jcheese•5/9/25, 11:03 PM

Is there a way to “re-instantiate” a specific do?

Jjcheese Is there a way to “re-instantiate” a specific do?

1984 Ford Laser•5/9/25, 11:10 PM

What do you mean by that exactly? you can delete its storage which essentially resets it

11984 Ford Laser What do you mean by that exactly? you can delete its storage which essentially r...

jcheese•5/9/25, 11:14 PM

theres some DOs that just give "internal error; reference = moh644b953d9vckab1seqm9a" and I cant access it at all