Vercel Knowledge Base
How to Internationalise Error Pages in Next.js App Router
A practical guide for implementing localized error pages in the Next.js App Router with a maintainable routing strategy.
Hey, I'm Jonas Herrmannsdörfer
I'm a Developer Success Engineer at Vercel based in Germany. I work at the intersection of product, developer education, and real-world implementation with a strong focus on Next.js and React.
Before joining Vercel, I spent more than eight years building frontend and full-stack products across startups, enterprise teams, and consulting projects. I also run React.js and TypeScript trainings at workshops.de.
I regularly share what I learn through conference talks, workshops, and technical writing.
Latest Writing
View all →Vercel Knowledge Base
Dynamic Redirects with Edge Config and Next.js Proxy
How to build and manage dynamic redirect systems using Edge Config and proxy patterns in Next.js.
Vercel Knowledge Base
How to Optimize Your Document Size in Next.js
Techniques to reduce payload and improve performance by optimizing document size in Next.js applications.
Latest Speaking
View all →🎤 Conference📍 Bad Nauheim, Germany
One Roundtrip to rule them all: GraphQL-Architektur für eine neue User Experience
🎪 programmier.con Web & AI Edition 2025
🎤 Conference📍 Mannheim, Germany
4 Critical Antipatterns in React/TypeScript (and How We Fixed Them)
🎪 enterJS
🎤 Conference📍 Munich, Germany
Mastering React: 5 Antipatterns and How to Fix Them
🎪 International JavaScript Conference