Dev tools · alternatives · 2026

24 alternatives to Streaming JSON in Rust

Terabytes of JSON, kilobytes of memory

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.

1. 1
   Python JSON library in Rust, faster than ujson▲40

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

   2018 · github.com · its alternatives →

2. 2
   A fast JSON library for Go▲119

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

   2021 · github.com · its alternatives →

3. 3AF
   Apache Fory Rust – 10-20x faster serialization than JSON/Protobuf▲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:…

   Oct 2025 · fory.apache.org · its alternatives →

4. 4
   Gojay – Performant JSON encoder/decoder for Golang▲153

   high performance JSON encoder/decoder with stream API for Golang - GitHub - francoispqt/gojay: high performance JSON encoder/decoder with stream API for Golang

   2018 · github.com · its alternatives →

5. 5
   SwimOS Rust – A framework for real-time streaming data applications▲71

   2024 · github.com · its alternatives →

6. 6
   RipDB▲65

   Fast, decentralized key-value Store for web3 builders

   2022 · zdenham.github.io · its alternatives →

7. 7
   ffjson: faster json serialization in Go▲83

   2014 · journal.paul.querna.org · its alternatives →

8. 8
   JQL – A JSON Query Language CLI Tool Built with Rust▲25

   crates.io serves as a central registry for sharing crates, which are packages or libraries written in Rust that you can use to enhance your projects

   2020 · crates.io · its alternatives →

9. 9
   Visualising how streaming AJAX speeds up the web▲13

   A streaming approach to JSON. Oboe.js is a Javascript library for Node.js and browsers that speeds up web applications by providing parsed objects before the response completes

   2014 · oboejs.com · its alternatives →

10. 10
    Feedsmith — Fast parser & generator for RSS, Atom, OPML feed namespaces▲70

    Hi HN! While working on a project that involves frequently parsing a lot of feeds, I needed a fast JavaScript-based parser to extract specific fields from feed namespaces. Existing Node packages were either too slow or merged all feed formats, losing namespace information. So I decided to write it myself and created this NPM package with a simple API. Feedsmith supports all feed formats and many popular namespaces, including: Podcast, Media, iTunes, Dublin Core, and more. It can also parse and generate OPML files. I am currently adding support for more namespaces and feed generation for RSS,…

    2025 · github.com · its alternatives →

11. 11
    JSON Sharp▲73

    Tool for lazy developers to convert JSON to C# Objects

    2020 · jsontocsharpconverter.web.app · its alternatives →

12. 12
    SPath is a Rust lib for query JSONPath over any semi-structured data▲35

    Query expressions for semi-structured data. Contribute to cratesland/spath development by creating an account on GitHub.

    2025 · github.com · its alternatives →

13. 13
    fastjson - Fast JSON Parsing for Go▲20

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

    2018 · github.com · its alternatives →

14. 14
    Incremental JSON parser for streaming LLM tool calls in Ruby▲13

    Built this for streaming AI tool calls. LLMs stream function arguments as JSON character-by-character. Most parsers reparse from scratch each time - O(n²) behavior that causes UI lag. This maintains parsing state, processing only new characters. True O(n) performance that stays imperceptible throughout the entire response. Ruby gem, MIT licensed. Would love feedback.

    Oct 2025 · aha.io · its alternatives →

15. 15
    JSON-Threat-Protection Rust High-Performance Crate▲34

    A crate to protect against malicious JSON payloads. - ADD-SP/json-threat-protection.rs

    2024 · github.com · its alternatives →

16. 16
    fastgron: A JSON to GRON Converter That's 40 Times Faster Than Gron▲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!

    2023 · github.com · its alternatives →

17. 17
    StaticJSON: fast, direct and static typed parsing of JSON with C++▲18

    Fast, direct and static typed parsing of JSON with C++ - netheril96/StaticJSON

    2016 · github.com · its alternatives →

18. 18
    Cyjson – Fast and Efficent JSON Parser for Python▲10

    2015 · github.com · its alternatives →

19. 19
    JSON-to-JSON mapping done easily▲14

    2019 · github.com · its alternatives →

20. 20
    Nano-JSON-stream-parser, a 750 bytes streamed JSON parser▲6

    A complete, pure JavaScript, streamed JSON parser in less than 1kb. - VictorTaelin/nano-json-stream-parser

    2017 · github.com · its alternatives →

21. 21
    JSONBason▲15

    I've been at it again, just sharing my simple JSON data inspection tool, love webdev and single page apps, this one took 4 days and was a lot of fun. The code is not obfuscated so you can inspect it and see how it works (very simple, server side is even more simple) Pretty much just do a POST of your JSON data from within your code and it will convert it into a basic table for instant search and sort. Made with love for the fun of it, no ads, no paid anything, it's totally free. Please only send in sanitized/test data only, this is meant to help make webdev a bit easier and more fun.…

    2025 · jsonbason.com · its alternatives →

22. 22
    Gojay – highly performant JSON encoder/decoder for Golang▲11

    high performance JSON encoder/decoder with stream API for Golang - GitHub - francoispqt/gojay: high performance JSON encoder/decoder with stream API for Golang

    2018 · github.com · its alternatives →

23. 23JA
    JSON as Fast as Binary▲12

    2015 · hperadin.github.io · its alternatives →

24. 24
    Searchable compression for JSON – ~99% page skip and sub-ms lookups▲15

    Problem JSON/NDJSON is everywhere in data platforms, but compression usually breaks searchability. You either keep queryable raw stores (high I/O/egress) or compress into gz/zstd blobs (cheap to store, painful to probe). The “cloud tax” shows up as wasted reads. What I built (SEE — Semantic Entropy Encoding) A schema-aware, searchable compression codec for JSON that keeps exists/pos lookups fast while still compressing. Internals: structure-aware delta + dictionaries, a PageDir + mini-index to jump to relevant pages, and a tuned Bloom filter that skips ~99% of pages.…

    2025 · github.com · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →