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David Mytton

@davidmytton.social
495 followers 190 following 20 posts

Building the security platform that ships with your code at arcjet.com. Writing the console.dev devtools newsletter.

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David Mytton @davidmytton.social · 12/08/2025
Capability-based sandboxing in Wasm can lock down the external communication leg of @simonwillison.net's AI lethal trifecta. Private data via APIs + user prompt (untrusted content) + no fetch capability. This is what Microsoft is going for with Wassette opensource.microsoft.com/blog/2025/08...
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Sacha Greif @sachagreif.com · 10/08/2025
The State of CSS 2025 survey results are now available: 2025.stateofcss.com/en-US/ Big thanks to @amitsheen.bsky.social, @saron.bsky.social, @miocene.io, @sjoy.lol, @joshwcomeau.com, @kilianvalkhof.com, and all the other contributors!
2025.stateofcss.com
State of CSS 2025
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David Mytton @davidmytton.social · 05/08/2025
Moving to NYC! 🇺🇸 Packing the essentials
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Corbin Crutchley @crutchcorn.dev · 04/08/2025
Today's the day! We're releasing a new major feature of @tanstack.com Form for all adapters that allows you to change the validation mode based on submission. (For React nerds that's how RHF works OOTB) No breaking changes, trivial to implement; try it out! tanstack.com/form/latest/...
tanstack.com
Dynamic Validation | TanStack Form React Docs
In many cases, you want to change the validation rules based depending on the state of the form or other conditions. The most popular example of this is when you want to validate a field differently b...
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Gergely Orosz @gergely.pragmaticengineer.com · 05/08/2025
Wow - CNN’s front page is the investigation “Inside North Korea’s effort to infiltrate US companies.” 4 months ago covered this same threat in @pragmaticengineer.com with exactly this AI filter. If you’re hiring full remote as a tech company, you NEED to expect NK to try and infiltrate
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Ben Holmes @bholmes.dev · 05/08/2025
🔥 The MacOS Stickies app is so underrated. - Little floating windows to take notes throughout the day - Can pin/float on top of whatever you're doing - Can color-coat to organize thoughts ...Probably hasn't been changed since the 90s, but you can't knock stable software
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David Mytton @davidmytton.social · 03/08/2025
Reviewed github.com/9001/copyparty for the @console.dev newsletter this week. Makes anything a file server with resumable downloads/uploads + web UI. Also a great example of a super comprehensive README!
github.com
GitHub - 9001/copyparty: Portable file server with accelerated resumable uploads, dedup, WebDAV, FTP, TFTP, zeroconf, media indexer, thumbnails++ all in one file, no deps
Portable file server with accelerated resumable uploads, dedup, WebDAV, FTP, TFTP, zeroconf, media indexer, thumbnails++ all in one file, no deps - 9001/copyparty
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David Mytton @davidmytton.social · 02/08/2025
So many JS runtimes. Node.js. Edge runtime. Bun. Deno. workerd. At least one of these has already been deprecated, which is an issue if you've built your entire app around its APIs!
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TypeScript @typescriptlang.org · 01/08/2025
TypeScript 5.9 is now available! 📣 This release brings: ✅ An updated tsc --init ✅ Type-checking for the new 'import defer' ✅ Actual summaries in more DOM APIs ✅ Expandable quick info hovers (✨preview✨) and more! Read up more on our blog: devblogs.microsoft.com/typescript/a...
devblogs.microsoft.com
Announcing TypeScript 5.9 - TypeScript
Today we are excited to announce the release of TypeScript 5.9! If you’re not familiar with TypeScript, it’s a language that builds on JavaScript by adding syntax for types. With types, TypeScript mak...
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Scott Hanselman 🌮 @scott.hanselman.com · 02/08/2025
The S in MCP stands for security
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David Mytton @davidmytton.social · 02/08/2025
A prize to anyone who can name all my laptop stickers 👀 www.youtube.com/watch?v=Cuem...
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David Mytton @davidmytton.social · 01/08/2025
Useful security assumptions for 2025: - All your personal data has already been "lost" - A random dependency has been compromised with a malware post-install script - Your washing machine has a zero day and is now part of a botnet
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David Mytton @davidmytton.social · 30/07/2025
That you need to use react-hook-form to do anything more than the most basic form... The next Next.js <Form> component is a good first step, but it only supports POST requests right now yorickpeterse.com/articles/thr...
yorickpeterse.com
Three HTTP versions later, forms are still a mess
The last few weeks I've been working on adding an HTTP 1.1 stack to the standard library of Inko as part of this pull request. The work is still ongoing but the initial set of changes will include an…
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Opal @opalescentopal.bsky.social · 27/07/2025
With Tom Lehrer's passing, I suppose this is a moment to share the story of the prank he played on the National Security Agency, and how it went undiscovered for nearly 60 years.
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Kevin Webb @kevinwebb.io · 04/06/2025
One of the best examples of LLM developer tooling I've heard is from a team that supports software from the 80s-90s. Their only source of documentation is *video interviews* with retired employees. So they feed them into transcription software and get summarized searchable notes out the other end.
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Tech on the Rocks @totrrocks.bsky.social · 19/12/2024
Join us at another episode of Tech on the Rocks, this time with @davidmytton.social of Arcjet. We talk about security as code, security in a world of AI and dev tooling. Check the episode here: buff.ly/4ggWGeO
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Filippo Valsorda @filippo.abyssdomain.expert · 18/11/2024
A friend got her (Android) phone stolen and the thieves were able to quickly pivot into her Google account and then bank. I’ve been wondering how they did that and my best guess is SMS password resets (aka SMS 1FA). So yeah, SIM PINs (or eSIMs) might help. Also no text body on lock screens.
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Matt Pocock @mattpocock.com · 18/11/2024
'AI Engineer' means you build things that contain AI - LLM chains, agents, multi-modal stuff. So, what is its opposite? What do we call a 'normal' software engineer?
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Arcjet @arcjet.com · 15/11/2024
Creating an email parser requires combining local part parsing with domain parsing to ensure we validate the syntax against the RFCs...but of course just following the RFC doesn't quite work in the real world!
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David Mytton @davidmytton.social · 14/11/2024
Developer <-> security interaction today is pretty negative. After coding, testing, deploying...they get hit from 2 angles:
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David Mytton @davidmytton.social · 12/11/2024
Love the minimalism of iCloud Mail on the web especially now it has primary inbox, and dark mode that works properly. Gmail's "dark" theme really is terrible - the web UI is such a mess.
iCloud Mail web UI
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Arcjet @arcjet.com · 11/11/2024
The ultimate Next.js SaaS template: next-forge.com ORM, auth, billing, analytics, website, blog, cron jobs, dark mode, email, testing. Built with @nextjs.org @vercel.com @prisma.io and a great set of amazing tools
next-forge.com
Production-grade Turborepo template for Next.js apps
A monorepo template designed to have everything you need to build your new SaaS app as quick as possible. Authentication, billing, analytics, SEO, database ORM and more — it's all here.
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David Mytton @davidmytton.social · 08/11/2024
Go is the best
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David Mytton @davidmytton.social · 02/11/2024
🫠
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console.dev @console.dev · 01/11/2024
Interesting devtool of the week: rsbuild.dev by @rspack.bsky.social What we like: Designed as an alternative to Vite and Create React App/Webpack. Compiles TypeScript, Sass, Wasm, JSX. Handles image compression, CSS builds e.g. PostCSS, and type checking. Not tied to a UI framework
rsbuild.dev
Rsbuild
The Rspack-based build tool
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David Mytton @davidmytton.social · 01/11/2024
Great seeing so many developers and founders interested in devtools & infra on Monday at the first console.dev San Francisco devtools meetup!
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