zap

Name: zap
Brand: zap

Fast, structured, leveled logging for Go applications

softwareMonitoring & Logging LoggingGoPerformance

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Our Verdict

Best for

High-performance Go apps

Skip if

Multi-language projects

What is zap?

Zap is a high-performance logging library written in Go, designed for speed and low memory allocation. It provides structured, leveled logging that integrates seamlessly with Go applications and other logging tools. Because it is self‑hosted and open source, teams can embed it directly into their services without external dependencies, making it ideal for DevOps pipelines and production environments.

SpecificationsAI-estimated

deploymentSelf-hosted

open source✅ Yes

github stars24,583

api available✅ Yes

support optionsEmail, GitHub Issues

key integrationsGo applications, logging tools

primary languageGo

Key Features of zap

Zap writes log entries with minimal allocations, often under 100 ns per call, enabling high‑throughput services.

It supports leveled logging (Debug, Info, Warn, Error, DPanic, Panic, Fatal) to filter output by severity.

Zap can output logs in JSON or console format, facilitating ingestion by log aggregators and human‑readable debugging.

The logger can be configured at runtime with atomic levels, allowing dynamic log level changes without restart.

Zap provides a SugaredLogger API for ergonomic, printf‑style logging while retaining the performance of the strongly typed logger.

It integrates with the standard library's log package, letting existing code adopt Zap with minimal changes.

Zap includes built‑in sampling to reduce log volume in high‑traffic scenarios while preserving important events.

The library offers hooks for custom fields and encoders, enabling deep integration with monitoring and tracing systems.

Use Cases for zap

Microservice Observability

Emit structured JSON logs from Go microservices for centralized analysis.

CI/CD Pipeline Debugging

Capture detailed logs during builds and deployments to troubleshoot failures quickly.

High‑Throughput APIs

Maintain low latency logging in APIs handling thousands of requests per second.

Dynamic Log Level Control

Adjust log verbosity on the fly in production without restarting services.

Pros & Cons of zap

Pros

Extremely low latency and allocation overhead
Rich structured logging out of the box
Supports both strongly typed and sugared APIs
Easy integration with existing Go codebases

Cons

Requires explicit field definitions for maximum performance, which can add boilerplate
Limited to Go ecosystem; no native support for other languages
Configuration can be verbose for complex setups

Frequently Asked Questions

Is Zap suitable for production use?

Yes, Zap is widely used in production systems due to its speed, low overhead, and structured output.

Can I change log levels without restarting my service?

Yes, Zap’s atomic level feature allows runtime log level adjustments.

Does Zap support log rotation?

Zap itself does not rotate files; you can combine it with external tools like logrotate or use a custom WriteSyncer.

Is there a way to log to multiple destinations simultaneously?

Yes, you can create a multi‑core logger that writes to multiple WriteSyncers, such as files and stdout.

Pricing Overview

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Free

Detailed plans are not listed. Visit the official website for pricing information.

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Top Alternatives & Similar Tools

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Logrus

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Logrus is a popular, open‑source logging library for Go that provides leveled, structured, and extensible logging. It integrates seamlessly with Go applications, allowing developers to output logs in JSON, text, or custom formats. Designed for performance and flexibility, Logrus supports hooks, custom formatters, and easy integration with monitoring tools, making it ideal for both simple scripts and large microservice architectures.

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