I haven't tried it yet, but if anyone is trying to do a lot with durable objects then its probably w

I haven't tried it yet, but if anyone is trying to do a lot with durable objects then its probably worth looking into using lumenize to have workers handle the actual fetch etc to be more efficient and save on billing https://lumenize.com/docs/proxy-fetch/

Proxy Fetch | Lumenize

Offload Requests to a Worker and/or a Durable Object and have it execute a handler when the fetch is done

Ggruntlord6 I haven't tried it yet, but if anyone is trying to do a lot with durable objects...

PhoenixSpace•11/5/25, 6:12 PM

(I think your link is malformed)

PPhoenixSpace (I think your link is malformed)

gruntlord6OP•11/5/25, 6:46 PM

you don't visit the .com root every day? Thanks

Llambrospetrou I don't know the numbers off my head, but I can easily see it breaching the 1s t...

1984 Ford Laser•11/5/25, 9:46 PM

Appreciate the discussion on this. My use case only needs to stay within a few seconds for around 30 minutes at a time. I'm also not fussed about forcing the DO active as it will only be for a few hours a week per DO (maybe 20 DO instances total) so not any decent scale. Sounds like I need to not stress so much about syncing every second, will have a bit of a think about it

1534980751438970153470891543•11/5/25, 10:04 PM

does the durable object jurisdiction param only matter upon creation

1534980751438970153470891543•11/5/25, 10:06 PM

i.e. create the DO with the eu jurisdiction param (once), then omit the param forever afterwards

1534980751438970153470891543•11/5/25, 10:07 PM

knowing this will either be a few or many lines of change

11534980751438970153470891543 i.e. create the DO with the eu jurisdiction param (once), then omit the param fo...

Hard@Work•11/5/25, 10:07 PM

I would just keep it, there isn't really a reason not to send it

1534980751438970153470891543•11/5/25, 10:08 PM

im just wondering if its redundant

11534980751438970153470891543 im just wondering if its redundant

Hard@Work•11/5/25, 10:09 PM

It shouldn't be? Though actually, it might error if you don't provide it?

1534980751438970153470891543•11/5/25, 10:10 PM

1534980751438970153470891543•11/5/25, 10:10 PM

so it isnt redundant

Hard@Work•11/5/25, 10:11 PM

Yeah

1534980751438970153470891543•11/5/25, 10:11 PM

thanks

boop•11/5/25, 10:45 PM

If you generate and query by name, you have to supply the jurisdiction. If you use durable object IDs, the jurisdiction is embedded in the ID so you don't have to limit the namespace. This has been my experience

calvinfo•11/5/25, 10:47 PM

hey folks, supposing I wanted to bind a sandbox to an internal service (separate DO), is that possible? I was digging around the docs and didn't find anything too promising, but wanted to double check here.

basically I want to be able to do something like:

worker → create sandbox, execute commands in a loop → sandbox-backend (handles things like auth)

feel free to also redirect me if there's a better channel

Ccalvinfo hey folks, supposing I wanted to bind a sandbox to an internal service (separate...

Hard@Work•11/5/25, 11:30 PM

?crossposting

SuperHelpflare•11/5/25, 11:30 PM

Please do not post your question in multiple channels/post it multiple times per the rules at #

welcome-and-rules. It creates confusion for people trying to help you and doesn't get your issue or question solved any faster.

Ccalvinfo hey folks, supposing I wanted to bind a sandbox to an internal service (separate...

Larry•11/5/25, 11:33 PM

The Worker to DO pattern is the norm, but I'm uncertain what you mean by "sandbox". Is it untrusted code?

LLarry The Worker to DO pattern is the norm, but I'm uncertain what you mean by "sandbo...

1984 Ford Laser•11/5/25, 11:43 PM

Probably the CF Sandbox SDK https://developers.cloudflare.com/sandbox/ which is basically containers with a wrapper

11984 Ford Laser Probably the CF Sandbox SDK https://developers.cloudflare.com/sandbox/ which is ...

Larry•11/6/25, 12:04 AM

Ahh, makes sense. I'm unfamiliar with that product, although I think it would be cool to get my AI Coding Agent to run in one of them. Just not sure how I'd see the output.

LLarry Ahh, makes sense. I'm unfamiliar with that product, although I think it would be...

1984 Ford Laser•11/6/25, 12:05 AM

Stream it back via WebSockets

11984 Ford Laser Stream it back via WebSockets

Larry•11/6/25, 12:34 AM

Would need something like that. I'm sure someone has already built that or will soon.

mau•11/6/25, 2:50 AM

Request/Question:

I was wondering if there’s a way to perform a cross join between data stored in different Durable Object tables — similar to how PostgreSQL uses foreign data wrappers (FDWs). It would be game changer.

Mmau Request/Question: I was wondering if there’s a way to perform a cross join betw...

Larry•11/6/25, 3:41 AM

That would be a neat trick, but I've never heard of anything like that, and I probably would have if it existed.

LLarry Would need something like that. I'm sure someone has already built that or will ...

ALECKS•11/6/25, 4:13 AM

It's built in, you can open a ws to anything insider your sandbox
https://developers.cloudflare.com/sandbox/guides/websocket-connections/

AALECKS It's built in, you can open a ws to anything insider your sandbox https://devel...

Larry•11/6/25, 4:19 AM

It's good to know that the WebSocket part is already built in. Do you know anyone who is using it as a remote AI coding platform? I'd love to hear more about the setup.

ALECKS•11/6/25, 4:21 AM

No I just recently found out about this myself. Looks like a killer offering tho... docker container, with DO-like ergonomics

ALECKS•11/6/25, 4:29 AM

Does anyone happen to know, if you call a DurableObject via RPC, does that implicitly also wake up its associated Worker?

To ask differently. Do I get billed more if I do:
CallerA -> WorkerB.rpc() -> DO-B.rpc()
vs
CallerA -> DO-B.rpc()

AALECKS Does anyone happen to know, if you call a DurableObject via RPC, does that impli...

Larry•11/6/25, 5:08 AM

What is CallerA? Is it client-side (browser or app)? Workers RPC is between Workers, DOs, and RpcTargets. If you want all the way to the client, you need something like Cap'n Web or Lumenize RPC. If you are just using Workers RPC, the called DO is accessed directly without the involvement of the Worker in the module where that DO is defined.

Kunal Verma•11/6/25, 7:31 AM

how can I view storage.kv/_cf_KV items for remote durable objects?

scruffy•11/6/25, 10:35 AM

Hihi! If I spin up a Durable Object to store session data via the KV API and give the data an expiry via TTL, will the Durable Object still exist after the data's expired? If so, is there any residual wrapper that might incur storage costs?

Sscruffy Hihi! If I spin up a Durable Object to store session data via the KV API and giv...

Larry•11/6/25, 12:19 PM

Workers KV has expiration dates but the KV inside a DO does not. You'd have to implement that yourself, or use Workers KV.

KKunal Verma how can I view storage.kv/_cf_KV items for remote durable objects?

Larry•11/6/25, 12:30 PM

You can add a method on the remote DO that returns it and then call that method remotely using Workers RPC. So,

this.env.REMOTE_DO.getByName('remote-instance-name').get_cf_KV()

this.env.REMOTE_DO.getByName('remote-instance-name').get_cf_KV()

. If you are going to call the remote DO more times, I recommend that you two-step it and put the the remote DO stub in a variable. So:

const remoteStub = this.env.REMOTE_DO.getByName('remote-instance-name');
const remote_cf_KV = remoteStub.get_cf_KV();

const remoteStub = this.env.REMOTE_DO.getByName('remote-instance-name');
const remote_cf_KV = remoteStub.get_cf_KV();

if you are using id's instead of instance names its:

const remoteId = this.env.REMOTE_DO.getIdFromString('23abc...');  // 64 byte opaque hex
const remoteStub = this.env.REMOTE_DO.get(remoteId);
const remote_cf_KV = remoteStub.get_cf_KV();

const remoteId = this.env.REMOTE_DO.getIdFromString('23abc...');  // 64 byte opaque hex
const remoteStub = this.env.REMOTE_DO.get(remoteId);
const remote_cf_KV = remoteStub.get_cf_KV();

The only tricky part most of the time is knowing the id or name of the remote DO.

LLarry Workers KV has expiration dates but the KV inside a DO does not. You'd have to i...

scruffy•11/6/25, 12:56 PM

thanks for the info. in terms of how to implement in DO, is this only doable via alarms or are there other alternatives?

Bboop If you generate and query by name, you have to supply the jurisdiction. If you u...

1534980751438970153470891543•11/6/25, 6:04 PM

that wouldve saved me a lot of work lol....

1534980751438970153470891543•11/6/25, 6:06 PM

at least it looks consistent... i added jurisdiction even when using the DO IDs

WWallslide When I'm running a worker locally, how can I clear out my local durable objects

Hard@Work•11/6/25, 11:55 PM

You can nuke the

.wrangler

.wrangler

directory, or find the specific DO namespace folder and delete it

Tuna•11/7/25, 7:00 AM

HI everyone,

is it possible to mix a durableObject to have Sqllite and also key value?
i have some structured data that i want to save and avoid recalculating, the issue that if i use tabular structure its take for ever to save to sqlite, and if i use a json its failing cause this json is too big.
what is the best practice here?

Ffaraday sql durable objects have synced kv storage

Larry•11/7/25, 12:03 PM

As of 2025-09-12 compatiblity date you can do

const x = this.ctx.storage.kv.get(”x”);  // no await

const x = this.ctx.storage.kv.get(”x”);  // no await

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

Jaiganesh•11/7/25, 1:25 PM

Hi, I was also wondering the same thing...
I am not a developer but an infra guy ... could you please let me know how to dump SQLlite manually?

JJaiganesh Hi, I was also wondering the same thing... I am not a developer but an infra guy...

Larry•11/7/25, 3:27 PM

Export ~~for backup~~ is a real hole in Cloudflare's offering at this time. I keep saying, "You have read replicas working. Please, just disconnect one and stick the .sqlite file in R2." The response I keep getting is that idea is just one option that's part of a larger discussion. What I haven't heard is that I'm wrong and it's not as easy as I think, but I do wonder if that's true.

LLarry Export ~~for backup~~ is a real hole in Cloudflare's offering at this time. I ke...

lambrospetrou•11/7/25, 3:37 PM

What I haven't heard is that I'm wrong and it's not as easy as I think, but I do wonder if that's true.

I said this multiple times

Right now, you cannot just go and "disconnect one and stick the .sqlite file in R2". It can be done, and that's our plan in some form, but it's not a 2 hour thing our next intern can do.

And to add more colour, it's not that it takes 8 months to do this, it's just that other priorities postponed this work.

Llambrospetrou > What I haven't heard is that I'm wrong and it's not as easy as I think, but I ...

lambrospetrou•11/7/25, 3:40 PM

Exporting, backups, migration to some other database system, are all on the roadmap. You can argue they should be higher priority than what is delivered, which is fair, but we can say that for all the other 100 features users are asking for.

Llambrospetrou Exporting, backups, migration to some other database system, are all on the road...

Larry•11/7/25, 3:58 PM

When I've been in product manager roles in the past, whenever some annoying person (like I am right now) tells me something should be easy, my reply is, "Not as easy as you think, but if you tell me which of these 10 other things that are near the top of the backlog you would like this to take priority over, we will put it in that spot. Think about it overnight and we'll adjust when you come back in the morning." They usually look at the list and tell me that they think the priorities are pretty close to right as-is. I'm sure that's the case now also.

Burrito•11/7/25, 4:22 PM

Not just for backup, real data is also useful for debugging. It's not always simple to manually reproduce a complex database locally.