orjson
Fast, correct JSON library for Python.
Pricing
Free tier
Flat rate
Adoption
→StableLicense
Open Source
Data freshness
Aging · Jun 8, 2026Overview
What is orjson?
orjson is a high-performance JSON parser and generator written in Rust. It offers significant speed improvements over the standard json module in Python, making it ideal for applications where performance is critical.
Key differentiator
“orjson stands out as one of the fastest Python libraries for JSON processing, offering significant speed improvements without sacrificing correctness.”
Capability profile
Capability Radar
Honest assessment
Strengths & Weaknesses
↑ Strengths
↓ Weaknesses
orjson is primarily designed for Python and lacks native support for other languages, limiting its use in polyglot environments.
Setting up orjson in complex or non-standard Python environments (like embedded systems) can be challenging due to Rust dependencies and compilation requirements.
The community around orjson is relatively small compared to more established JSON libraries, which may result in slower resolution of issues and fewer resources for troubleshooting.
Fit analysis
Who is it for?
✓ Best for
Developers working on high-performance Python applications that require frequent JSON operations
Projects needing to optimize the speed of JSON parsing and generation in their critical paths
✕ Not a fit for
Applications where simplicity is prioritized over performance
Scenarios where the overhead of integrating a new library outweighs potential performance gains
Cost structure
Pricing
Free Tier
Available
Open source — free to use
Starts at
$0
Model
Flat rate
Enterprise
None
Performance benchmarks
How Fast Is It?
Ecosystem
Relationships
Next step
Get Started with orjson
Step-by-step setup guide with code examples and common gotchas.