Sonnet – The fastest JSON parser I can think of in Go
- What's different? It's fast. On my machine, the stream decoder is faster than bytedance/sonic which claim to be the fastest even though mine is written in pure Go and Sonic is written in Go + C + Assembly. It also is a drop-in replacement of the standard library. - Why is it fast? technologies used are in my articles (available in English and Japanese) EN: https://sugawarayuuta.medium.com/still-i-wanted-to-build-the... JA: https://zenn.dev/sugawarayuuta/articles/2a5a3cb3f9a504
Sonnet – The fastest JSON parser I can think of in Go launched on May 1, 2023 with 7 votes, #1,883 of 4,910 launches that month and more than 50% of that year's launches. The site was still online in September 2026, 3 years on.
What it does
High performance JSON decoder in Go. Contribute to sugawarayuuta/sonnet development by creating an account on GitHub.
Does a similar job
all alternatives →
A fast JSON library for Go2021 · github.com · ▲119Fast JSON encoder/decoder compatible with encoding/json for Go - goccy/go-json
Gojay – Performant JSON encoder/decoder for Golang2018 · github.com · ▲153high performance JSON encoder/decoder with stream API for Golang - GitHub - francoispqt/gojay: high performance JSON encoder/decoder with stream API for Golang
The fastest JSON parser for GoJul 2026 · github.com · ▲7THE fastest alternative JSON parser for Go that does not require schema - buger/jsonparser
fastjson - Fast JSON Parsing for Go2018 · github.com · ▲20Fast JSON parser and validator for Go. No custom structs, no code generation, no reflection - valyala/fastjson
ffjson: faster json serialization in Go2014 · journal.paul.querna.org · ▲83- AFApache Fory Rust – 10-20x faster serialization than JSON/ProtobufOct 2025 · fory.apache.org · ▲67
Serialization framework with some interesting numbers: 10-20x faster on nested objects than json/protobuf. Technical approach: compile-time codegen (no reflection), compact binary protocol with meta-packing, little-endian layout optimized for modern CPUs. Unique features that other fast serializers don't have: - Cross-language without IDL files (Rust ↔ Python/Java/Go) - Trait object serialization (Box) - Automatic circular reference handling - Schema evolution without coordination Happy to discuss design trade-offs. Benchmarks:…
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