Jeremy Morrell
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jeremymorrell.dev
Jeremy Morrell
@jeremymorrell.dev
2.5K followers 630 following 5.2K posts
Principal engineer @ Cloudflare. I talk about tech sometimes

Location: Squamish, BC 🇨🇦
Website: https://jeremymorrell.dev/
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jeremymorrell.dev
More of this please www.theverge.com/policy/85990...
You know what's "offensive and sexualized," you worthless fucking cowards? Nonconsensual AI-generated images of women in bikinis spreading their legs, and of children with so-called "donut glaze" on their faces — which, by the way, were being generated at a rate of one per minute. I'd also call that "offensive, insensitive, upsetting, intended to disgust, in exceptionally poor taste" and especially "just plain creepy"! Do you need a back brace to stand up straight, buddy? Because at this point, I am certain you haven't got a single vertebra.
January 9, 2026 at 10:06 PM
jeremymorrell.dev
We need LLM warning stickers
Warning sign attached to a lathe: This machine does not know the difference between metal and flesh, nor does it care
January 6, 2026 at 7:52 PM
jeremymorrell.dev
Interesting thread and responses. Props to @dollspace.gay 👏 bsky.app/profile/maxi...
Doll challenges someone doubting the ability for LLM tooling to help software engineers, even leveraging things like proof systems. After all, where is all the new software in our day to day lives? (A good question) Maxine proposes implementing a specific scikit module since they have experience building exactly this in their studies Doll delivers in 3 hours with a linked GitHub repo Maxine’s response is “holy shit”. They expand later in the thread on their interpretation of the implemented module
January 4, 2026 at 10:28 PM
jeremymorrell.dev
We’re finally letting the 9 year old watch Jurassic Park, which he’s been begging to see since he was 4
Dr Alan Grant is pointing at a brachiosaurus
December 20, 2025 at 11:50 PM
jeremymorrell.dev
These two handsome boys are 1 year old today! Happy Birthday Bug and Patch ❤️
Bug is sitting in a 3d printer filament box. Despite his wishes he does not fit Patchy is a sweet boy Bug and Patch sharing a cat tree bed meant for one kitty Both kitties looking out a window together
December 19, 2025 at 3:21 AM
jeremymorrell.dev
One of the unexpected benefits of cat ownership is that we can place the used cat litter (pine pellets) in the green bin, and this has *dramatically* cut down on bears trying to get into it

They get a mouthful of cat urine dust and decide this… wasn’t really the snack they were after
A photo from earlier in the year where the neighborhood bear has pried a corner of our green bin’s lid open so it can spill out the contents This is generally bad for bears. They start to associate humans with food and can get more aggressive.
November 30, 2025 at 4:21 AM
jeremymorrell.dev
If the change was in the underlying v8 engine I don't think Node has much of a say in it? Same for Cloudflare Workers which is built on v8

github.com/v8/v8/commit...
Without pointer compression, the max string length on 64-bit platforms used to be 2**30 (minus header). With pointer-compression, this was accidentally lowered to 2**28 (which is the historical limit for 32-bit platforms). This CL bumps the limit on 64-bit platforms to 2**29, which is the maximum we can support given that any heap object's size in bytes must fit into a Smi (which are now 31-bit on all 64-bit platforms, with or without pointer compression).
November 27, 2025 at 12:17 AM
jeremymorrell.dev
Still waiting on tech support, but at least printing from a microSD card still works great, so I can use the printer in the meantime
A fine benchy print in white PLA
November 18, 2025 at 12:17 AM
jeremymorrell.dev
Downloaded an ancient version of the mac app, and it can see the printer! 🥳

But... it also fails to login when I try to get them to talk to each other...
Connecting to the printer returns some sort of HTTP 400 error, likely because the API is no longer supported
November 15, 2025 at 8:25 PM
jeremymorrell.dev
I’m calling this a success! (except that he has chosen @ctrlspice.bsky.social’s desk bed instead of my desk bed. He’s been there all day)
An extremely relaxed cat laying belly-up in a homemade cat bed attached to a desk
November 13, 2025 at 1:24 AM
jeremymorrell.dev
Yes! My steam deck has basically been a Hades 2 machine since EA 😅
Steam play time showing 188 hours on Hades 2
November 9, 2025 at 6:53 PM
jeremymorrell.dev
I’m working on clearing out my garage of gear and stuff that I’ll likely never use again, and this is the listing I put up for these giant cams
Truly enormous 9 inch cams, home made by one guy in a garage shop and they look it. They are burly and heavy but there was no commercial equivalent a decade ago and there may still not be Have your eye on sending Pipeline next season? Are perfect hand jams just not nearly painful enough for you? Do your back and ankles have just *too much* skin? Offwidth might be for you! Come back alive by getting the right protection My offwidth days are behind me so come get these 2 enormous cams for a bargain. https://weighmyrack.com/brand/valley-giant Me on the crux section of Pipeline. It’s a ~7 inch overhanging crack and my body is fully inside with only my face and one arm visible. My expression is one of extreme anguish
November 7, 2025 at 4:55 PM
jeremymorrell.dev
This was a bit more than that. I should maybe have just bought the real ones 😅 I just kind of winged it with some black pipes and connectors and bolted the thing to my desk with everything tightened as much as possible
The underside of the cat bed showing black pipes connected together with flanges screwed into the desk and a piece of wood for the cat bed
November 3, 2025 at 1:48 AM
jeremymorrell.dev
The kitten seems to have accepted the home-made cat bed I built for my desk 🥰
A gray and white kitten resting in a gray soft cat bed atop a cat tree attached to a desk made out of the thick black pipes sometimes used for coffee tables and the like
November 3, 2025 at 12:49 AM
jeremymorrell.dev
Trick or Treating is going to be… interesting this year. Kids are still psyched tho
Weather app showing 10c (50F) and raining all evening
October 31, 2025 at 10:58 PM
jeremymorrell.dev
I have enjoyed working with this team so so much 🧡
Tweet from Zeb: This has been what I've been working on for nearly a year now, super excited to finally do the first release of Automatic Tracing. Starting today anyone with Observability enabled will automatically get traces generated for their Workers that are present in the Cloudflare dashboard and can be sent to third party observability providers. We've had internal teams and select customers using this for a while and they've been able to make good performance gains through the increased understanding of what's happening in their Worker. But, today's release is only the first of many. There are several things that we didn't have time to include in this first release like context propagation for distributed tracing, user-created spans, even span events, or even some CF bindings we didn't get to instrument. All of these gaps are on the tracing roadmap and will be released as they're ready, but in the meantime there's still a lot of useful data for those that have Workers in production. Everyone on the Workers Observability team did a stellar job on this, but specifically @JeremyMorrell was incredible in making sure everything was thought through and would be built to last. Also big shout-out to the folks on the runtime team that created the new runtime primitives for tracing, @DanLapidCF Felix and Mar. We literally couldn't have done this without them and they worked their asses off on building this for us.
October 28, 2025 at 1:36 PM
jeremymorrell.dev
It looks like wrangler / esbuild is defaulting to the commonJS build for some reason? You can get better results by setting an ENV var to force it to use the ESM build. I'm not sure if this could break anything.

We're still at 24kb though. Feels like we can probably do better
.env file containing: WRANGLER_BUILD_CONDITIONS=module,import Analysis from https://esbuild.github.io/analyze/ showing a 24kb bundle. We no longer see things like metrics, however we do have quite a bit of internal stuff
October 26, 2025 at 12:04 AM
jeremymorrell.dev
Playing around with @opentelemetry.io api in JS and @cloudflare.social wrangler bundles.

Importing the trace module to generate spans probably shouldn't be bringing in 63kb of JS 😬
Hello world cloudflare worker that only brings in @opentelemetry/api to generate a single span import { trace } from '@opentelemetry/api'; let tracer = trace.getTracer('my-tracer'); export default { async fetch(request, env, ctx): Promise<Response> { let span = tracer.startSpan('fetch'); span.setAttribute('http.method', request.method); span.setAttribute('http.url', request.url); span.setAttribute('http.status_code', '200'); span.end(); return new Response('Hello World!'); }, } satisfies ExportedHandler<Env>; ESBuild analysis from https://esbuild.github.io/analyze/ showing that this simple import brings in 63kb of JS including lots of things we're not using like baggage and metrics
October 25, 2025 at 11:54 PM
jeremymorrell.dev
It's kinda complicated tbh qiolor.com/blogs/news/r...
As of recent legislation, Class 1 and Class 2 e-bikes are generally permitted on trails designated for bicycle use within state recreation areas unless specifically prohibited. However, many wilderness areas and sensitive ecological zones restrict all motorized vehicles, including e-bikes. Under current federal policy, e-bikes are permitted in National Parks wherever traditional bicycles are allowed, including park roads, paved or hardened trails, and areas designated for off-road motor vehicle use. However, individual park superintendents retain the authority to restrict e-bike access in specific areas. For instance, Yosemite National Park permits e-bikes on all paved roads where traditional bicycles are allowed but prohibits them on most unpaved trails. Death Valley National Park, conversely, allows e-bikes on many backcountry roads, offering unique opportunities for desert e-biking adventures.
October 24, 2025 at 6:18 PM
jeremymorrell.dev
Soon 👀
Tweet from my PM: Something ✨new✨ is coming to Workers Observability 👀 can you guess what it is Plus an illustration of someone sitting in front of a big dashboard with a conspicuous trace waterfall view in the top left
October 23, 2025 at 1:02 AM
jeremymorrell.dev
This phrase comes to mind a lot lately
A red poster with a rocking horse. Overlaid is text: Dont mistake motion for progress
October 12, 2025 at 2:25 AM
jeremymorrell.dev
“Momentum theater” captures a lot of what bothers me about the “omg we’re cooking so hard, shipping so fast” posturing that seems so common these days
There's a reason 996 culture flourishes in companies that haven't figured out product-market fit. If you have something people want, you don't need to run your team into the ground to move units. If you don't, all that's left is momentum theater. I've seen teams work twelve-hour days trying to brute-force their way to growth. It rarely ends well. They burn out before they break through.
October 12, 2025 at 2:25 AM
jeremymorrell.dev
but also smol
Screencap from a youtube walkthrough of the car. The boxy car only comes up to just below the man's shoulders, and takes up maybe 60% of a parking space.
October 6, 2025 at 6:21 PM
jeremymorrell.dev
Claude basically one-shotted it (though I lost a few hours trying to figure out how to work with accessibility permissions during development in XCode 😅)

This feels so so much better than anything else I've been able to find
September 27, 2025 at 11:38 PM
jeremymorrell.dev
Being able to send email was probably my biggest missing feature from the Cloudflare platform. So excited to see this beta! blog.cloudflare.com/email-service/
Code snippet showing a Cloudflare binding for sending email export default { async fetch(request, env, ctx) { await env.SEND_EMAIL.send({ to: [{ email: "hello@example.com" }], from: { email: "api-sender@your-domain.com", name: "Your App" }, subject: "Hello World", text: "Hello World!" }); return new Response(`Successfully sent email!`); }, };
September 25, 2025 at 1:28 PM