About ohler55/oj
Oj is a high-performance JSON parser and object marshaller implemented as a Ruby gem. It provides fast parsing and serialization of JSON data, with support for multiple modes including strict JSON compliance, compatibility with the JSON gem, and custom Rails/ActiveSupport behavior. Oj's parser (Oj::Parser) is optimized for speed and offers option isolation. The library is widely used in Ruby and Rails applications for efficient data interchange. It is open-source under the MIT license and actively maintained.
Key Features
Fast JSON parsing and generation
Object marshalling from and to JSON
Multiple modes: strict, JSON gem compatibility, Rails/ActiveSupport compatibility, custom mode
Option isolation per parser instance
Comprehensive documentation and security updates
MIT license, free and open source
Pros & Cons
Pros
- Extremely fast parsing compared to standard JSON libraries
- Flexible mode system adapts to different compliance needs
- Well-documented and actively maintained
- Compatible with Rails and ActiveSupport out of the box
- Lightweight gem with no external dependencies
Cons
- Designed specifically for Ruby; not usable in other languages
- Advanced configuration options may have a learning curve
- Not a standalone tool; requires Ruby environment
Best For
High-performance JSON parsing in Ruby applicationsSerializing Ruby objects to JSON for APIsReplacing default JSON gem with faster alternativeIntegrating with Rails and ActiveSupportData interchange and storage
FAQ
How do I install Oj?
Install via gem command: `gem install oj` or add `gem 'oj'` to your Gemfile.
Is Oj compatible with Rails?
Yes, Oj provides a Rails quickstart section in its documentation and supports Rails/ActiveSupport compatibility mode.
What JSON modes does Oj support?
Oj supports strict JSON compliance, a mode mimicking the JSON gem, a mode mimicking Rails/ActiveSupport, and a custom mode for user-defined behavior.