Zap vs Bunyan: What are the differences?
Developers describe Zap as "Blazing fast, structured, leveled logging in Go (by Uber)". Zap takes a different approach. It includes a reflection-free, zero-allocation JSON encoder, and the base Logger strives to avoid serialization overhead and allocations wherever possible. By building the high-level SugaredLogger on that foundation, zap lets users choose when they need to count every allocation and when they'd prefer a more familiar, loosely typed API. On the other hand, Bunyan is detailed as "A logging module for node.js services". It is a simple and fast JSON logging module for node.js services. It has extensible streams system for controlling where log records go (to a stream, to a file, log file rotation, etc.).
Zap and Bunyan can be categorized as "Logging" tools.
Zap and Bunyan are both open source tools. Zap with 7.81K GitHub stars and 597 forks on GitHub appears to be more popular than Bunyan with 5.96K GitHub stars and 488 GitHub forks.