simdjson/simdjson

Health v2 · maintenance only

Adoption not part of the score

24196 stars · 1275 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

A C++ library that parses JSON at gigabytes-per-second speeds using SIMD instructions and microparallel algorithms, with runtime CPU-tailored parser selection. It provides full JSON and UTF-8 validation and is widely adopted in production systems like Node.js, ClickHouse, and Meta Velox.

Use cases

• parse json as fast as possible in c++
• validate utf-8 at high throughput
• minify large json files quickly
• parse ndjson streams at gigabytes per second
• speed up json parsing in a database engine
• replace rapidjson with a faster parser

When to choose

• you need maximum JSON parsing throughput in C++
• you process large JSON or NDJSON datasets
• you want strict validation with lossless parsing
• you need a battle-tested parser used by major projects

When to avoid

• you need a JSON serializer/writer more than a parser
• you work in a language without simdjson bindings
• your JSON payloads are tiny and parsing speed is irrelevant
• you need DOM-style mutable JSON manipulation

Facets

library · maturity stable

parser serialization json benchmarking parsers performance developer-tools databases cpp cross-platform windows wasm simd json-parser high-performance avx2 avx512 neon utf8-validation ndjson linux macos gpu

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markdown · JSON · MCP: product_card(name="simdjson/simdjson")