ujson: Ultra Fast JSON for Python

UltraJSON (ujson) is an ultra-fast JSON encoder and decoder for Python, implemented in pure C with Python bindings. It focuses on performance for serialization and deserialization tasks. As of version 5.12.0, the project is in a maintenance-only mode due to architectural challenges in making changes without introducing security vulnerabilities. Support for new Python versions and critical bug/security fixes will continue, but other changes are generally rejected.