Sebastian Beltran

OSS Advocate | Member of expressjs @openjsf webpack | All opinions are mine

Sebastian Beltranbjohansebas
2026-01-31

Si usas o planeas usar Clawdbot/OpenClaw (o el nombre que termine teniendo la próxima semana), échale un vistazo a este video (youtu.be/QFhDB3UEFm8?si=LSX9J4), súper recomendado. La seguridad es lo primordial, por encima de todo. Es una herramienta excelente y le tengo muchísimo hype.

Sebastian Beltranbjohansebas
2026-01-30

And what if we rewrote Express in Rust?

Sebastian Beltranbjohansebas
2026-01-29

January was a pleasant and productive month in open-source: many things got done, like new releases of iconv-lite, improvements in Express and Webpack, performance optimizations, and much more.

If you want to see everything that happened 👇

bjohansebas.me/blog/2026-janua

Sebastian Beltranbjohansebas
2026-01-29

Enero fue un mes agradable y bonito en open-source, se trabajaron muchas cosas, como nuevas releases de iconv-lite, mejoras en Express y Webpack, optimizaciones de rendimiento y mucho más.

Si quieres ver todo lo que pasó 👇

bjohansebas.me/es/blog/2026-ja

Sebastian Beltranbjohansebas
2026-01-25

Fun fact, you can send the ETag header as a section trailer, wow.

Sebastian Beltranbjohansebas
2026-01-16

I definitely did not expect this, Astro joining Cloudflare. I'm really happy for Astro and they’ll surely do amazing things within Cloudflare, and I hope that over the years they continue to keep the promise that it will remain open governance.

blog.cloudflare.com/astro-join

Sebastian Beltranbjohansebas
2026-01-14

After months (yes, months, because I have a life beyond open source) I finally finished the draft PR I had to add HTTP/2 support to on-finished, also thanks to the help of my Express teammates. Feel free to review it, any help is welcome.

github.com/jshttp/on-finished/

Sebastian Beltranbjohansebas
2026-01-13

🎉 The codemods to migrate Express to version 5 are now available on codemod.com!

👉 Run the recipe: npx codemod@latest @expressjs/v5-migration-recipe

👉 More codemods here: codemod.link/express

Sebastian Beltranbjohansebas
2026-01-09

Okay, today I spent time organizing the webpack security group. Tomorrow I’ll do the same with the Express TypeScript group.

Sebastian Beltranbjohansebas
2026-01-08

🚀 iconv-lite@1.0.0.alpha.0 has been released! 🎉

⚠️ Breaking:
- Node <18 & safe-buffer removed 🛑
- Native TextDecoder now used 🖥️

✨ Improvements:
- Backend abstraction for Uint8Array 🌐
- GBK table updated 📜

github.com/pillarjs/iconv-lite

Sebastian Beltranbjohansebas
2026-01-08

🚀 iconv-lite@0.7.2 has been released! 🎉

📦fixed the TypeScript definitions to correctly reflect the library's CommonJS exports

github.com/pillarjs/iconv-lite

Sebastian Beltranbjohansebas
2026-01-07

Luckily, npm ignores .env files when publishing, otherwise, I’d be worried right now.

Sebastian Beltranbjohansebas
2026-01-06

Reviewing vulnerability reports, when it’s unclear whether something is truly a vulnerability or not, requires genuinely taking the time to deeply analyze scenarios where it could actually have an impact. Most of the time, it turns out to be simply a bug that needs to be fixed, without any security implications for the software

Sebastian Beltranbjohansebas
2025-12-31

happy new year!🎉

Sebastian Beltranbjohansebas
2025-12-30

@giggls it may not be dangerous, but we need to work on adding it in a safe way, and that’s something we know Express 5 is lacking. Pull requests are always welcome.

Sebastian Beltranbjohansebas
2025-12-30

@giggls There were reasons to remove much of the regex support and features, and then gradually work on adding them back, but without the possibility of unintentionally introducing a ReDoS.

Sebastian Beltranbjohansebas
2025-12-28

In the next major version of iconv-lite, it will use TextDecoder. With this, we are working to get closer to the specification, although there is still a lot of work to be done.

github.com/pillarjs/iconv-lite

Sebastian Beltranbjohansebas
2025-12-27

Hi, I’m Sebastián. Greetings from Colombia.

I’m a full-stack developer and a maintainer of several open-source projects such as Express and Node.js.
Additionally, I’m currently studying electronic engineering.

I’m a cat lover, and I really enjoy listening to music.

If you’d like to talk about technology or anything else, I’m always happy to chat in DMs.

Sebastian Beltranbjohansebas
2025-12-27

He actualizado mi CV, ahora disponible en mi sitio web 🌐

Inglés: bjohansebas.me/cv
Español: bjohansebas.me/es/cv

Lo mejor: solo edito un JSON para mantenerlo al día, sin rehacer nada 😅 (¡gracias a quien me dio la idea hace mucho tiempo!)

Client Info

Server: https://mastodon.social
Version: 2025.07
Repository: https://github.com/cyevgeniy/lmst