Python JSON library in Rust, faster than ujson
Fast, correct Python JSON library supporting dataclasses, datetimes, and numpy - ijl/orjson
Python JSON library in Rust, faster than ujson launched on December 19, 2018 with 40 votes, #627 of 2,148 launches that month and more than 90% of that year's launches. The site was still online in September 2026, 7 years on.
In plain words
Python JSON library in Rust is a development tool that provides JSON parsing and serialization for Python applications using Rust for improved performance. It targets Python developers who need faster JSON handling than the standard ujson library. The tool leverages Rust's speed advantages to deliver quicker JSON operations while maintaining compatibility with Python workflows.
written from the facts on this page · September 2026
Does a similar job
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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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