Rare find

YYJSON. A faster way to read and write JSON in Swift apps.

github.com/mattt/swift-yyjson

Problem

The full read on this project is a sign-in away — what it solves, who it serves, and where it sits in the market.

Audience

The full read on this project is a sign-in away — what it solves, who it serves, and where it sits in the market.

Market

The full read on this project is a sign-in away — what it solves, who it serves, and where it sits in the market.

Pricing

The full read on this project is a sign-in away — what it solves, who it serves, and where it sits in the market.

Vaya's read on this project

Problem, audience, market, and the verdict — sign in to see it.

Updates

May 2026

Release —0.6.0 May 31
Bump version to 0.6.0 May 31
Add lossless Decimal encoding and decoding (#20) May 31

February 2026

Release —0.5.0 Feb 6
Add encoding / serialization option to write infinity and NaN as null… Feb 6
Rename prettyPrintedTwoSpaces to indentationTwoSpaces (#17) Feb 6
Add Linux support (#16) Feb 6
Add direct write pass to `YYJSONSerialization` to bypass Foundation r… Feb 5
Add `YYJSONSerialization` formatting options (#13) Feb 5
Release —0.4.0 Feb 5
Add sortedKeys option for JSON encoding (#14) Feb 5
Release —0.3.1 Feb 4
fix: JSON integer to Swift Double decoding (#12) Feb 4

January 2026

Optimize string conversions and array size calculation (#11) Jan 18
Add benchmark results for tokenizer.json (#7) Jan 9
Add benchmarking information to README (#6) Jan 9
Release —0.3.0 Jan 9
Bump version to 0.3.0 Jan 9
Update design and implementation of in-place parsing (#5) Jan 9
Update JSON values to lazily convert to Swift string (#4) Jan 9
Release —0.2.1 Jan 9
Remove unsafe flags in Cyyjson target (#3) Jan 9
Release —0.2.0 Jan 8
Bump version to 0.2.0 Jan 8
Conditionalize features with Swift 6.1 package traits (#2) Jan 8
Add CI workflow (#1) Jan 8
Release —0.1.0 Jan 8
Initial commit Jan 8