Yoshifumi Kawai – Medium

Yoshifumi Kawai

ToonEncoder — A JSON-Compatible Format Encoder for C# and LLMs

I’ve created a serializer (encode-only) for Token-Oriented Object Notation (TOON), a JSON-compatible format. When used appropriately, TOON…

Dec 25, 2025

ToonEncoder — A JSON-Compatible Format Encoder for C# and LLMs

Dec 25, 2025

“ZLinq”, a Zero-Allocation LINQ Library for .NET

I’ve released ZLinq v1 last month! By building on structs and generics, it achieves zero allocations. It includes extensions like LINQ to…

May 15, 2025

“ZLinq”, a Zero-Allocation LINQ Library for .NET

May 15, 2025

MasterMemory v3 — A Fast Read-Only In-Memory Database for C# with Source Generator Support

I’ve released MasterMemory v3! It finally supports Source Generators!

Dec 20, 2024

MasterMemory v3 — A Fast Read-Only In-Memory Database for C# with Source Generator Support

Dec 20, 2024

ConsoleAppFramework v5.3.0

I’ve made a relatively significant update to ConsoleAppFramework v5! For details about v5 itself, please refer to my previous article…

Dec 17, 2024

Dec 17, 2024

MessagePack for C# v3 Release with Source Generator Support

Last month, the MessagePack for C# project joined the .NET Foundation! I hope this will help users feel more confident about using the…

Dec 6, 2024

Dec 6, 2024

Fast Dictionary Lookup of UTF-8 String in the C# 13 with .NET 9 AlternateLookup

In .NET 9, a new method GetAlternateLookup<TKey, TValue, TAlternate>() has been added to dictionary-like classes: Dictionary…

Aug 29, 2024

Aug 29, 2024

ZLogger v2 Architecture: Leveraging .NET 8 to Maximize Performance

We have released ZLogger v2, a new ultra-fast and low-allocation logging library for C# and .NET. It’s been completely redesigned from v1…

Jul 5, 2024

ZLogger v2 Architecture: Leveraging .NET 8 to Maximize Performance

Jul 5, 2024

ConsoleAppFramework v5 — Zero Overhead, Native AOT-compatible CLI Framework for C#

We have released a completely new version of ConsoleAppFramework. It is a brand new framework that has been completely redesigned and…

Jun 14, 2024

Jun 14, 2024

How to create a modern C# web API client: An example implementation of the C# SDK for Anthropic…

Anthropic Claude 3, a recently emerged rising star among LLMs, has exceptionally high performance and surpasses GPT-4! I am greatly…

Mar 24, 2024

How to create a modern C# web API client: An example implementation of the C# SDK for Anthropic…

Mar 24, 2024

R3 — A New Modern Reimplementation of Reactive Extensions for C#

Recently, I officially released R3 as a new implementation of Reactive Extensions for C#! R3 is named as the third generation of Rx…

Mar 5, 2024

R3 — A New Modern Reimplementation of Reactive Extensions for C#

Mar 5, 2024

Yoshifumi Kawai

Yoshifumi Kawai

a.k.a. neuecc. Creator of UniRx, UniTask, MessagePack for C#, MagicOnion etc. Microsoft MVP for C#. CEO/CTO of Cysharp Inc. Live and work in Tokyo, Japan.

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