/Tech4h ago

Bun Adds SIMD-Optimized JSON Parser for Faster Installs and Lower Memory

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Jarred Sumner@jarredsumner#1502inTech

The AST format for JSON is more compact now, which reduces memory usage

In the next version of Bun

bun install & bun's bundler get a new SIMD-optimized JSON parser

In ideal conditions: package installs get up to 40% faster & peak memory usage drops by 2x

7:26 PM · Jun 29, 2026 · 933 Views

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Users are excited about Bun adding a SIMD-optimized JSON parser because it promises faster installs and lower memory usage.

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The approach is inspired by SIMDJSON

https://github.com/oven-sh/bun/pull/33032

The AST format for JSON is more compact now, which reduces memory usage

4h71372

John@jrysana

@jarredsumner Ooooh very cool

3h10