Lib.rs

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#simd-json #string #avx2 #neon #optimized #avx-512

json-escape-simd

Optimized SIMD routines for escaping JSON strings

by LongYinan

8 stable releases

Uses new Rust 2024

3.0.1 Oct 14, 2025
3.0.0 Oct 13, 2025
2.0.0 Oct 13, 2025
1.1.0 Sep 23, 2025
0.0.0 Sep 23, 2025

#75 in Hardware support

Download history 2199/week @ 2025-09-23 2353/week @ 2025-09-30 3288/week @ 2025-10-07 12253/week @ 2025-10-14 19943/week @ 2025-10-21 26460/week @ 2025-10-28 15428/week @ 2025-11-04 13902/week @ 2025-11-11 16464/week @ 2025-11-18 19971/week @ 2025-11-25 13617/week @ 2025-12-02

66,773 downloads per month
Used in 91 crates (3 directly)

MIT license

71KB
2K SLoC

json-escape-simd

Crates.io Version docs.rs CodSpeed Badge

Optimized SIMD routines for escaping JSON strings. The implementation is from sonic-rs, we only take the string escaping part to avoid the abstraction overhead.

Benchmarks

Numbers below come from cargo bench runs on GitHub Actions hardware. Criterion reports are summarized to make it easier to spot relative performance. "vs fastest" shows how much slower each implementation is compared to the fastest entry in the table (1.00× means fastest).

GitHub Actions x86_64 (ubuntu-latest)

AVX2 enabled.

Short string payload (~89M iterations)

Implementation Median time vs fastest
escape simd 56.23 ns 1.00×
escape generic 111.58 ns 1.98×
serde_json 111.65 ns 1.99×
json-escape 140.01 ns 2.49×
escape v_jsonescape 151.98 ns 2.70×
escape sonic 202.21 ns 3.60×

RxJS payload (~10k iterations)

Implementation Median time vs fastest
escape simd 246.84 µs 1.00×
escape sonic 261.87 µs 1.06×
escape v_jsonescape 531.77 µs 2.15×
json-escape 561.93 µs 2.28×
escape generic 664.00 µs 2.69×
serde_json 649.19 µs 2.63×

Fixtures payload (~300 iterations)

Implementation Median time vs fastest
escape simd 9.1461 ms 1.00×
escape sonic 9.3410 ms 1.02×
json-escape 19.077 ms 2.09×
escape v_jsonescape 20.015 ms 2.19×
serde_json 21.240 ms 2.32×
escape generic 22.512 ms 2.46×

GitHub Actions aarch64 (ubuntu-24.04-arm)

Neon enabled.

Short string payload (~76M iterations)

Implementation Median time vs fastest
escape simd 65.42 ns 1.00×
escape generic 108.28 ns 1.66×
serde_json 110.73 ns 1.69×
json-escape 150.64 ns 2.30×
escape v_jsonescape 183.41 ns 2.80×
escape sonic 212.87 ns 3.25×

RxJS payload (~10k iterations)

Implementation Median time vs fastest
escape simd 283.40 µs 1.00×
escape sonic 305.34 µs 1.08×
json-escape 468.04 µs 1.65×
escape generic 548.50 µs 1.94×
serde_json 567.23 µs 2.00×
escape v_jsonescape 758.18 µs 2.68×

Fixtures payload (~300 iterations)

Implementation Median time vs fastest
escape simd 10.46 ms 1.00×
escape sonic 11.18 ms 1.07×
json-escape 15.45 ms 1.48×
escape generic 17.75 ms 1.70×
serde_json 18.01 ms 1.72×
escape v_jsonescape 24.93 ms 2.38×

GitHub Actions macOS (macos-latest)

Apple M1 chip

Short string payload (~45M iterations)

Implementation Median time vs fastest
escape simd 113.16 ns 1.00×
serde_json 128.52 ns 1.14×
escape generic 136.06 ns 1.20×
json-escape 173.16 ns 1.53×
escape v_jsonescape 198.80 ns 1.76×
escape sonic 226.21 ns 2.00×

RxJS payload (~10k iterations)

Implementation Median time vs fastest
escape sonic 379.94 µs 1.00×
escape simd 395.41 µs 1.04×
json-escape 618.74 µs 1.63×
escape generic 690.86 µs 1.82×
serde_json 720.05 µs 1.89×
escape v_jsonescape 839.86 µs 2.21×

AFFiNE sources payload (~300 iterations)

Implementation Median time vs fastest
escape simd 12.60 ms 1.00×
escape sonic 14.04 ms 1.11×
json-escape 21.54 ms 1.71×
serde_json 23.33 ms 1.85×
escape generic 24.55 ms 1.95×
escape v_jsonescape 26.82 ms 2.13×

Apple M3 Max

Short string benchmark

Implementation Median time vs fastest
escape simd 90.58 ns 1.00×
serde_json 139.23 ns 1.54×
escape generic 146.15 ns 1.61×
json-escape 173.60 ns 1.92×
escape v_jsonescape 198.60 ns 2.19×
escape sonic 199.27 ns 2.20×

RxJS payload (~10k iterations)

Implementation Median time vs fastest
escape simd 196.07 µs 1.00×
escape sonic 196.32 µs 1.00×
json-escape 446.94 µs 2.28×
escape generic 488.37 µs 2.49×
serde_json 553.08 µs 2.82×
escape v_jsonescape 618.31 µs 3.15×

AFFiNE sources payload (~300 iterations)

Implementation Median time vs fastest
escape simd 10.36 ms 1.00×
escape sonic 10.57 ms 1.02×
escape generic 17.61 ms 1.70×
json-escape 18.01 ms 1.74×
serde_json 19.00 ms 1.83×
escape v_jsonescape 21.38 ms 2.06×

No runtime deps