Head-to-Head: Bunyan vs Caterpillar Analysis


v1.8.15(over 3 years ago)

This package was last published over a year ago. It may not be actively maintained.Types definitions are provided via a separate npm package: @types/bunyanNumber of direct dependencies: 4Monthly npm downloads

Bunyan is a simple and fast JSON logging library for Node.js applications. It is designed to be easy to use and highly performant, making it ideal for logging structured data in a production environment. Bunyan allows you to log messages at different levels of severity, add contextual information to log entries, and easily integrate with various logging transports like files, streams, and external services.


Tags: node.jsloggingJSONstructured-dataperformance


v8.2.0(6 months ago)

This package is actively maintained.Types definitions are bundled with the npm packageNumber of direct dependencies: 4Monthly npm downloads

Caterpillar is the ultimate logging system for Deno, Node.js, and Web Browsers. Log levels are implemented to the RFC standard. Log entries can be filtered and piped to various streams, including coloured output to the terminal, the browser's console, and



Bunyan is a widely adopted logging library with a sizable user base and active community support. Caterpillar, while less popular, also has a decent following but may not have as much community support or resources available.


Both Bunyan and Caterpillar are scalable and can handle a large volume of logs. Bunyan is known for its high performance and efficient log handling, making it suitable for large-scale applications. Caterpillar also provides scalability features, but it may not be as performant as Bunyan for extremely high loads.

Ease of Use

Bunyan is praised for its simple and easy-to-use API. It provides a straightforward configuration and integrates well with other Node.js libraries and frameworks. Caterpillar, while also relatively easy to use, may require a bit more effort for setup and configuration compared to Bunyan.


Both libraries offer essential logging functionalities such as log levels, log formatting, and log output customization. Bunyan provides additional features like structured logging, log rotation, and log streaming out of the box. Caterpillar, on the other hand, has a more minimalistic approach and focuses on providing core logging capabilities.

Community Support

Bunyan has a larger community and active development, which means better community support, frequent updates, and bug fixes. Caterpillar, while it may have a smaller community, still benefits from open-source collaboration and continuous improvements.


Bunyan has comprehensive and well-documented official documentation, making it easy for developers to learn and use the library effectively. Caterpillar may have less extensive documentation and fewer examples available, which could make it slightly more challenging for newcomers to get started.