WebSocket servers in JavaScript: Node.js, Bun and Deno in 2026 – Daniel Lemire's blog

kept by eddie oct 13

Node.js 26 with uWebSockets.js achieves ~49k round‑trips/sec, outpacing Bun and Deno, while the ws package shows similar relative rankings across runtimes.

Node.js needs a virtual file system
A large PR adding a virtual file system to Node.js core, mostly written by Claude Code, divides commenters on AI's role and the feature's value.
also on Deno, Node.js, Bun, #open-source, #developer-tools
LogTape
LogTape is a zero-dependency, library-first logging library for JavaScript runtimes that stays silent until the application opts in.
also on Deno, Node.js, Bun, #open-source, #developer-tools
Bun 1.4 | Bun Blog
Bun 1.4 rewrites the runtime in Rust, adds built-in headless browser automation, image and markdown APIs, boosts Node.js compatibility, and reduces CPU and memory usage.
also on Node.js, Bun, #benchmarks, #open-source, #developer-tools
GitHub - af/envalid: Environment variable validation for Node, Bun, and other compatible JS runtimes
Envalid provides validation and immutable access to environment variables, ensuring they meet expected formats before a Node.js or Bun program runs.
also on Node.js, Bun, #open-source, #developer-tools
I made a build profiler to understand Bun’s compile times - Lalit Maganti
The author built buildprof to trace Bun's compile times, revealing that Full LTO linking and a monolithic Zig module caused slow builds, which improved with ThinLTO and crate splitting.
also on Bun, #performance, #open-source, #developer-tools