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Dev tools · June 5, 2018

fastjson - Fast JSON Parsing for Go

Fast JSON parser and validator for Go. No custom structs, no code generation, no reflection - valyala/fastjson

fastjson - Fast JSON Parsing for Go launched on June 5, 2018 with 20 votes, #787 of 2,654 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 8 years on.

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In plain words

fastjson is a Go library that provides fast JSON parsing capabilities. It is designed for developers who need to process JSON data efficiently in Go applications. The library emphasizes performance optimization for parsing operations, making it suitable for projects where JSON processing speed is a priority. It is available as open-source code on GitHub.

written from the facts on this page · September 2026

Does a similar job

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  • A fast JSON library for Go2021 · github.com · ▲119

    Fast JSON encoder/decoder compatible with encoding/json for Go - goccy/go-json

  • ffjson: faster json serialization in Go2014 · journal.paul.querna.org · ▲83
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    high performance JSON encoder/decoder with stream API for Golang - GitHub - francoispqt/gojay: high performance JSON encoder/decoder with stream API for Golang

  • fastgron: A JSON to GRON Converter That's 40 Times Faster Than Gron2023 · github.com · ▲23

    Hello HN! I want to introduce fastgron, my new project. fastgron is a JSON to GRON converter, built to be incredibly fast – it's 40 times faster than Gron. GRON is a tool for making JSON greppable, but it can slow down with larger files. With fastgron, even a 200MB JSON file can be converted in just 1 second. Key features include streaming conversion for memory efficiency and an optimized path reconstruction for faster operations. It leverages C++ and the simdjson and fast_io libraries for speed. I welcome all feedback, suggestions, or questions. Thank you!

  • Jason – A new JSON Library for Go2014 · github.com · ▲106

    Easy-to-use JSON Library for Go. Contribute to antonholmquist/jason development by creating an account on GitHub.

  • Python JSON library in Rust, faster than ujson2018 · github.com · ▲40

    Fast, correct Python JSON library supporting dataclasses, datetimes, and numpy - ijl/orjson

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