uber-go/zap

Zap is a high-performance, structured logging library for Go that provides type-safe APIs for logging objects and arrays. It supports integration with Go's standard log/slog interface, gRPC, and io.Writer streams, while offering comprehensive testing utilities and in-memory observers for verifying log output. The system also includes internal optimizations such as zero-allocation buffers and buffered write syncers to improve throughput.

This period focused on enhancing logging performance through a new buffered write syncer and a zero-allocation buffer pool, alongside introducing Go generics for type-safe array logging. Significant effort was also dedicated to testing infrastructure, including an in-memory log observer, gRPC compatibility wrappers, and automated benchmarking tools to measure and compare structured logging performance.

12 changes

This period focused on integrating Go 1.21's log/slog via the new zapslog package and adding a streaming io.Writer for flexible log output. Internal refactoring included a leveled enabler to break cyclic dependencies, a generic object pool, and an efficient stack trace capture utility. The work also involved updating dependencies and adding integration tests for gRPC.

9 changes

uber-go/zap was measured the same way every project in this corpus was: the same rubric, at a pinned commit, with the result published in full. Point the surveyor at a repository you know and see whether you agree with it.