orjson
Fast Python JSON library with support for dataclasses, dates, and NumPy types.
Utilities PyPI
Used in agent projects
52
0.4% of 12,697 public repos built with AI coding agents
Rank in utilities
#41 of 109
by use in those projects
Downloads
47.9M
PyPI, last 7 days, orjson
GitHub stars
8,250
last push Oct 7, 2026
How orjson is used
orjson is a dependency in 52 of the 12,697 public GitHub projects set up for AI coding agents that we scanned (0.4%), #41 of 109 in utilities. The most used alternative there is clsx. Projects that use it most often also use Pydantic (76.9%), python-dotenv (73.1%), FastAPI (65.4%).
Often used with orjson
| Pydantic | 76.9% of orjson projects · 15.0× more than average |
|---|---|
| python-dotenv | 73.1% of orjson projects · 11.2× more than average |
| FastAPI | 65.4% of orjson projects · 15.5× more than average |
| PyYAML | 65.4% of orjson projects · 21.6× more than average |
| Requests | 65.4% of orjson projects · 12.3× more than average |
| Uvicorn | 63.5% of orjson projects · 14.8× more than average |
| NumPy | 57.7% of orjson projects · 15.0× more than average |
| Rich | 55.8% of orjson projects · 29.1× more than average |
By coding agent
| Claude Code | 0.7% of projects set up for it |
|---|---|
| GitHub Copilot | 0.5% of projects set up for it |
| Cursor | 0.4% of projects set up for it |
Share of public repos configured for each agent that list orjson as a dependency.
Install
| Package | pip install orjson |
|---|---|
| Main stacks | Python (51), Next.js (1) |
| Example projects | microsoft/edge-ai, kr8tiv-ai/Jarvis, touyi/solana-onchain-arbitrage-bot-contract, QPG-MIT/PixCell, ManojINaik/manimAnimationAgent |
Alternatives to orjson
| Tool | Used in agent projects | Downloads / wk | GitHub stars | License |
|---|---|---|---|---|
| clsx npm Tiny utility for conditionally constructing className strings. |
2,251 (17.7%) | 126M | 9,847 | MIT |
| date-fns npm Modern JavaScript date utility library with comprehensive formatting functions. |
1,079 (8.5%) | 97.6M | 36.6K | MIT |
| uuid npm Generate RFC9562 compliant UUIDs for unique identifiers in applications. |
454 (3.6%) | 296M | 15.3K | MIT |
| PyYAML pypi YAML parser and emitter for reading and writing YAML configuration files. |
385 (3.0%) | 239M | 2,954 | MIT |
| Lodash npm Modular utility library with methods for common programming tasks and data manipulation. |
269 (2.1%) | 162M | 61.4K | MIT |
| bn.js npm Big number library for handling arbitrary-precision integers in JavaScript. |
217 (1.7%) | 62.1M | 1,230 | MIT |
| python-dateutil pypi Extensions to Python's datetime module for advanced date and time manipulation. |
165 (1.3%) | 233M | 2,638 | Dual License |
| yaml npm JavaScript YAML parser and stringifier with full spec compliance. |
164 (1.3%) | 179M | 1,693 | ISC |