The Vite for Kotlin test suite fails with Kotlin 2.3.0 because... Kotlin Wasm has been optimized enough, that the generated Wasm file is so small, that Vite decides to inline it entirely, so there is no visible Wasm in the output

How was one of the most loved programming languages - Kotlin - created, and what is next after it? This is a rare and special conversation with Kotlin creator Andrey Breslav, with so many fascinating details on how Kotlin became the global success as it is today. youtu.be/ZggUn2mNqMU (cont'd)

OpenSavvy ❤️ Arrow

Spine is really cool! If you’re looking for a great way of doing typesafe routing in Ktor check it out! Now also with Arrow-kt support 😍

We got social media cards now! It uses the short title instead of the long one though… spine.opensavvy.dev/failures-arr...

Spine 0.9.1 comes with bug fixes for #Arrow compatibility for typed #Ktor endpoints: Thanks @skye.codes for the contribution!

This Thursday is the first Belgian #Kotlin Meetup of this year @ DPG Media! 8 spots left! Devs DPG will share how they have adopted #KMP in their iOS and Android apps, and after we’ll have an open space & networking event. It’s going to be super fun. www.meetup.com/belgian-kotl...

🗳️ Help us understand how you use Exposed! We’re running a short survey to learn how Exposed is used in real projects and where the experience can be improved. ⏱️ Just 5 minutes to make a big impact. Take the survey 👉 https://surveys.jetbrains.com/s3/757c90830e4e

It's #FOSDEM time! And we have a Kotlin Community stand. Come say hi if you're around!

Joining the #FOSDEM today! Ping us if you want to meet for a coffee and discuss Kotlin.

We're here at #FOSDEM! Visit the Kotlin Community Stand in Building K, level 1 (group A).

Open source friends 🫶 @postgresql.eu @kotlinlang.org

Thursday 12/02 we’re hosting the first BEKUG MeetUp of 2026 at DPGMedia in Vilvoorde! Interested or curious about @kotlinlang.org ? Register for free: meetu.ps/e/PNbwy/sYjb...

A benefit of upgrading to Spring Boot 4 for #Kotlin developers: you will be able to leverage JUnit 6 support for suspending functions to have cleaner tests.

#Kotlin's Ktor HTTP toolkit is pretty cool, having everything I need, like: - Multiplatform support; - Cancellation of HTTP requests; - OpenAPI docs auto-generation. https://blog.jetbrains.com/kotlin/2026/01/ktor-3-4-0-is-now-available/

Ktor 3.4.0 is out! 🎉 The release improves stability and brings new features: 🔶 Zstd compression 🔶 OkHttp duplex streaming 🔶 Structured concurrency for the HTTP request lifecycle 🔶 OpenAPI generation from code Read the blog post for details ⬇️ https://kotl.in/n31gtm

25 years ago, the first-ever JetBrains product was released: IntelliJ IDEA 1.0. To celebrate the occasion, the team invites you to a party with Runzo, our special guest, featuring a game by @glycin.bsky.social, interactive postcards, and exclusive giveaways. https://jb.gg/IJ25

When you hear JPA, you think #Java. But what about #Kotlin? This code looks correct, but a DB-generated ID changes after save() and entities disappear from HashSet/Map. Val and non-null types give false guarantees due to the reflection. How to avoid it 👇 jb.gg/3cn6mp

From #Either to Raise https://arrow-kt.io/lear...#Either #Kotlin #Arrow #FP

Compose Multiplatform 1.10.0 is out! 🎉 What’s new: ✨ Common @​Preview annotation 🧭 Support for Navigation 3 on non-Android targets 🔥 Stable and bundled Compose Hot Reload Learn more: https://blog.jetbrains.com/kotlin/2026/01/compose-multiplatform-1-10-0/

Yay, I'll be speaking in @amsterdam.voxxeddays.com! Curious about how early returns are used in Kotlin?

Reminder that in 2026, just like in 2025, `*.main.kts` files are better replacement for most of your scripting needs! mbonnin.net/2024-11-21_s...

My New Year's wish for you: may your type-system be strong and null-safe. #kotlin

List of the top contributors to the Kotlin Weekly in 2025 (this required a few iterations with AI to get it right):

Just tried Amper for the first time today. And I'm so in love already 🤤 It's SUPER simple to understand and configure, and just gets out of my way. I could even imagine doing major restructuring without the fear Gradle instilled into me. It's like, what the hell have we been tolerating

First-Class Kotlin Serialization Support in Spring Boot 4 itnext.io/first-class-...

In KtMongo 0.25.0, the new experimental BsonPath class allows extracting #MongoDB documents using #JSONPath queries! Currently only a subset of the JSONPath syntax is supported, more will be added in coming versions. Send us your feedback! ktmongo.opensavvy.dev/api/-kotlin%...

Kotlin 2.3.0 is out! Check out the highlights of this release on the Kotlin blog. 👉 https://kotl.in/trf88y

My last blog post of the year: Next level Kotlin support in Spring Boot 4. spring.io/blog/2025/12... #spring #kotlin

✨ Introducing the Golden Kodee Community Awards ✨ We’re celebrating the people who make the Kotlin community shine – educators, creators, organizers, and innovators. Think you deserve an award? 🏆 Nominate yourself now! → kotl.in/golden-kodee...

Arrow-kt 2.2.1.1 is out. Release notes: arrow-kt.io/community/bl... If you're curious about the Arrow-kt, or functional programming in Kotlin be sure to check out the website. It's full of cool sections on resilience, typed errors, coroutines, STM, immutable data, etc.

Unused value checker is really awesome! If you've not tried it, it's experimental in Kotlin 2.3.0 and check you didn't forget any computed values. I.e. it checks if you forgot to call bind(), or flatMap on an Either value and are tossing the result. Release notes: arrow-kt.io/community/bl...

Arrow 2.2.1 is out! Taking into account the new @kotlinlang.org 2.3, the library is now ready for the “unused value checker” 👷 arrow-kt.io/community/bl...

Spring Boot 4 now has automatic context propagation for Kotlin coroutines 🎉 Trace context flows inside coroutine execution, making async code simpler and ensuring seamless integration – all in the familiar Spring ecosystem. Try Spring with @kotlinlang.org 👉https://kotl.in/vk4h77

Kotlin 2.3.0 is out! My faves (no order) 😅 - Unused value checker - Improved Context Sensitive Resolution - Java 25 Bytecode - JS suspend function export - Better Swift Interop - Explicit backing fields - New Kotlin Uuid APIs and there is much more! Check it out: blog.jetbrains.com/kotlin/2025/...

💡 Did you know? Ktor has a built-in test framework for REST APIs. Run tests in isolation, verify endpoints, and serialize types safely. Docs 👉 https://kotl.in/ktor-test

Goodbye K1 mode! 👋 IntelliJ IDEA 2025.3 deprecates Kotlin K1. K2 now powers the IDE via the Kotlin Analysis API. This means: ⚡ Faster analysis on large projects 🧱 Stable foundation for evolving Kotlin support 🛠️ Improved stability More in the blog 👇 blog.jetbrains.com/idea/2025/12...

📢 If you’ve been meaning to send your KotlinConf 2026 talk proposal – this is your sign to do it now! The Call for Speakers is wrapping up tomorrow! Don’t miss the opportunity to share your expertise at the world’s largest Kotlin event. Submit here ⤵️ sessionize.com/kotlinconf-2...

Amper powered Apollo github.com/martinbonnin...

In 2 weeks we’re kicking off the Belgium @kotlinlang.org User Group with @sch3lp.bsky.social! The first session since 2019 😍 We’re starting off with a talk, and afterwards we’ll have an open space. There’ll will be lots of Kotlin and Kodee goodies 😁 See you there! www.meetup.com/belgian-kotl...

🐳 Ready to take your Ktor app live? With the Ktor Gradle plugin, packaging and deployment become simple and seamless. Check out this step‑by‑step guide to ensure smooth deployment 👉 https://kotl.in/tkzc0l

The most frequent question about Amper is definitely the extensibility story. You can find the answer now in the blog about the 0.9.0 release!

Kotlin samples are now part of the official Spring tutorials! 🚀 Check out the Spring WebFlux guide to build a RESTful web service, and switch easily between Java and Kotlin examples ⬇️ https://spring.io/guides/gs/reactive-rest-service

Want to advance your career as an Android developer by learning Kotlin Multiplatform (KMP)? Learn from LEGENDS like Jake Wharton, Philipp Lackner, @zacsweers.dev, @russhwolf.com, @marcogomiero.com , and @chriskrueger.dev. More info and register here: info.jetbrains.com/kotlin-lives...

blog.jetbrains.com/kotlin/2025/... great blog post that proves why moving to Kotlin is a good choice. @jlengrand.bsky.social and I can vouch for that 😉

All my fellow @kotlinlang.org server devs, there is still time to fill the annual Ktor survey! If you're using Ktor then please consider filling the survey, and help us continue making it better.

The @kotlinlang.org DA team @jetbrains.com is looking for a new team member to help promote and collaborate with Kotlin on the server with Spring! If you're passionate about Kotlin, and Spring this might be just the thing for you. job-boards.eu.greenhouse.io/jetbrains/jo...

Happy to announce that #Kotlin Community Stand was accepted at #FOSDEM2026! All Kotlin enthusiasts, see you in Brussels soon! fosdem.org/2026/news/20...

Just 6 months after a small-circle demo at KotlinConf, TestBalloon has achieved its first 100 stars on GitHub today. ♥️ On a mission to make Kotlin testing incredibly easy, its trajectory is showing lots of upwind, even compared to the wildly popular (and excellent) Ktor. github.com/infix-de/tes...