Streaming JSON in Rust
Terabytes of JSON, kilobytes of memory
Streaming JSON in Rust launched on January 30, 2026 with 7 votes, #1,609 of 14,584 launches that month and more than 90% of that year's launches.
What it does
Streaming JSON is a set of Rust libraries for parsing and transforming JSON using a sliding window approach, without loading the full document into memory. It includes: - "RJiter": a streaming JSON parser - "scan_json": trigger actions during parsing by matching keys and nested structures - "id_transform": copy input to output, a base for JSON rewriting - "ddb_convert": convert JSON to/from DynamoDB format, 12× faster than Python and 2× faster than a baseline Rust implementation
Process json while it's being generated. Contribute to olpa/streaming_json development by creating an account on GitHub.
Parse and transform JSON through a sliding window, without waiting for the complete document to load. scan_json is the fastest, 12 times faster than the Python botofrom github.com
Does a similar job
all alternatives →
Python JSON library in Rust, faster than ujson2018 · github.com · ▲40Fast, correct Python JSON library supporting dataclasses, datetimes, and numpy - ijl/orjson
A fast JSON library for Go2021 · github.com · ▲119Fast JSON encoder/decoder compatible with encoding/json for Go - goccy/go-json
- 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:…
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
SwimOS Rust – A framework for real-time streaming data applications2024 · github.com · ▲71
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