Golang zap logger example. We will analyze the key design .
Golang zap logger example Index func CustomRecoveryWithZap (logger ZapLogger, stack bool, recovery gin. GitHub Gist: instantly share code, notes, and snippets. 0 and Jan 6, 2025 · Log rotation is a critical aspect of maintaining healthy logging practices in production applications. Notice that it clones a new logger instead of modifying the logger. It stands out in the developer community for its blazing fast, low-allocation logging strategies, making it an ideal choice for applications that require high-speed logging with minimal overhead. Mar 27, 2022 · In this article, we will look into Structured Logging in Golang with Zap from Uber! When it comes to product development, logging plays a vital role in identifying issues, evaluating performances, and knowing the process status within the application. Nov 24, 2024 · OpenTelemetry Zap is a plugin for Zap logging library that provides integration with OpenTelemetry. May 17, 2024 · Hi everybody, continuing from the previous post, which was a basic setup with Golang. The presentation provided Feb 17, 2023 · When it comes to logging, there are plenty of options for Golang like Zerolog, Logrus and Zap. The recommended approach would be to put Dec 28, 2023 · Zerolog is a high-performance Go structured logging library aimed at latency-sensitive applications where garbage collections are undesirable Jan 19, 2022 · Examine five libraries for implementing a structured logging approach in Go apps, including Zap, Zerolog, Logrus, apex/log, and Log15. Zap Logger 1. g. Dec 4, 2023 · I am working on a log package and hope to configure whether to use log rotation through switches. However, these features are not built in directly—they need to be actively configured by us to enable them. These exporters send data to an external system like Grafana or another OTLP-compatible backend. This recently changed with the release of Go 1. In the linked article author sets a field EncodeLevel of EncoderConfig to a custom function. Contribute to gin-contrib/zap development by creating an account on GitHub. This guide covers how to use different logging levels and configure them to enhance your application's logging system. It introduces the basics of effective logging practices and dives into the `log` package from the standard library, covering usage and customization. HandlerFunc func Ginzap (logger ZapLogger, timeFormat string, utc bool) gin. Oct 4, 2024 · In this article, we'll explore structured logging in Go with a specific focus on the recently introduced log/slog package which aims to bring high-performance, structured, and leveled logging to the Go standard library. Previous code did not support log rotate // using zap. Zap is a high-performance, structured logging library for Go developed by Uber. org/zap and [OpenTelemetry]. Error() Our blog covers practical insights into Golang logging, including how to use the log package, popular third-party libraries, and tips for structured logging Golang Zap logger with context. Recently I switched from Java to Golang, and I am finding it easier to learn and fun than other languages I have worked on. NewSlogHandler to provide a slog. The zapr logr. Basic Logging with log The standard log package in Go provides basic logging Jan 28, 2025 · Abstract Zap is a very fast, structured, and log-leveled Go logging library developed by Uber. Among the contenders, Uber's Zap quickly distinguished itself with a relentless focus on performance and structured, leveled logging. New accepts a couple of options: otelzap. That way you can change encoding of logging level, timestamp, duration, caller and logger name. Contribute to yuseferi/zax development by creating an account on GitHub. Context has a Value method to keep variables under a context. Explore tips for structured, fast, and leveled logging. WithMinLevel(zap. Code structure based on ginrus package. This article will explore several popular logging libraries, such as logrus, zap, and the official slog. WarnLevel) sets the minimal zap logging level on which the log message is recorded on the span. ). Jul 17, 2024 · Zap Logger - Complete Guide to Golang Zap Logger Logging is the practice of recording or storing information and messages that provide insights into the behavior and execution of a program. Conclusion zap is a powerful and efficient logging library for Go that provides many useful features, such as structured logging, level-based logging, and log output customization. Feb 6, 2025 · We start by importing OpenTelemetry's SDK and exporters for logs, metrics, and traces. Contribute to go-logr/logr development by creating an account on GitHub. The OTLP gRPC exporter sends logs over the network via gRPC, and the Jul 2, 2024 · This guide explores the critical role of logging in GoLang application development. That enables slogr. We will analyze the key design Sep 11, 2018 · Zap allows to customize encoders. Dec 22, 2023 · Discover how the Zap Logger tool enhances the logging capabilities of your Go applications, ensuring fast, structured, and customizable logging to fit your needs. Mar 8, 2023 · Building a Logger Wrapper in Go with Support for Multiple Logging Libraries When building a Go application, logging is an essential part of the development process. HandlerFunc func RecoveryWithZap (logger . You know Golang has an context package and it's offically recommended to always pass a context as first argument. Structured Logging in Golang with Zap - Blazing Fast Logger In this article, we will look into Structured Logging in Golang with Zap from Uber! When it comes to product development, logging plays a vital role in identifying issues, evaluating performances, and knowing the process status within the application. Definition and origin of Zap Zap was developed with the goal of providing a structured logger that can offer I have integrated Zap with my go application, we have logs getting printed in two log files and i am also using Lumberjack for log rotation. Echo has 2 different logger middlewares: Older string template based logger Logger - easy to start with but has limited capabilities Newer customizable function based logger RequestLogger - allows developer fully to customize what is logged and how it is logged. Zap logger with OpenTelemetry support. Alternative logging through zap. Unlike Zap, all fields must be in the form of sugared fields -- it's illegal to pass a strongly-typed Zap field in a key position to any of the logging methods (Log, Error). Core), and developers can also customize their own logging packages based on this interface ( For example: the previous implementation of our New function). I want a few functions e. 3 days ago · NewExample builds a Logger that's designed for use in zap's testable examples. So, you should reassign the logger variable (or define a new variable) like this: logger = logger. Mar 6, 2024 · It looks like logger. Config and cannot log rotate // Build constr Aug 12, 2023 · } In this example, we define a custom customTimeEncoder function that formats timestamps using a custom format, and pass it to the EncodeTime field of the EncoderConfig. Handler which just Jul 31, 2021 · From the documentation: func (log *Logger) WithOptions(opts Option) *Logger WithOptions clones the current Logger, applies the supplied Options, and returns the resulting Logger. Jun 20, 2025 · Preface In existing logging libraries, including Go’s built-in log/slog logging library, they typically support log file rotation and splitting. Nov 29, 2016 · 10 I am building a web server in Golang. NewWithConfig(logger, config)) From here, we could use the sloggin middleware for Gin to instrument logging on every request with request and response information. Go provides several libraries for logging, including the standard log package and popular third-party libraries like zap. For example: The example above produces Blazing fast, structured, leveled logging in Go. You also can use zap. 16. Finally, we'll wrap up the article by touching base on more advanced topics such as custom encoders, multi-output logging, and using Zap as an Slog backend. Additionally, it provides instructions on Nov 3, 2023 · DPanicOnBugs controls whether extra log messages are emitted for invalid log calls with zap's DPanic method. Blazing fast, structured, leveled logging in Go. HandlerFunc func GinzapWithConfig (logger ZapLogger, conf *Config) gin. Suitable for usage with 3rd party logger libraries. SlogHandler. InfofContext(ctx, "Failed to fetch URL: %s", url) Options otelzap. It is easy, rich and faster, but how to handle the messages logged from zap in our tests? *all examples are tested with the Zap 1. WithErrorStatusLevel(zap. However, most logging libraries also privide a way to inherit logger, say, creating child loggers with fields from its Dec 26, 2021 · How can I prepend every log entry with the correct level label (like for Info it would be <6>) with uber-zap library? EDIT: This is the relevant part of my logger configuration: Aug 29, 2025 · Package otelzap provides a bridge between the go. An example might look something like this. According to the Uber — go Zap documentation, it performs better than similar structured logging packages and is also faster than the standard library. 为什么选择Uber-go zap 它同时提供了结构化日志记录和printf风格的日志记录 它非常的快 根据Uber-go Zap的文档，它的性能比类似的结构化日志包更好——也比标准库更快。 以下是Zap发布的基准测试信息 记录一条消息和10 Golang Zap Logging example with Elastic Search, Kibana & Filebeat for centralised logging. Examples of using Uber's zap Go logging library. zip that will insert the message and fields into a database table for querying. Once finalized Jan 16, 2021 · Last year I started working with Golang, mainly building REST APIs with the default net/http package. It helps manage disk space usage and keeps logs organized by automatically archiving and cleaning up old log files. But i am trying to display the logs in console as well, Jun 8, 2021 · Z ap is one of the most used log libraries for Golang. Learn how to implement structured logging and improve application observability with best practices and tools like Uptrace. Oct 21, 2019 · NewExample builds a Logger that's designed for use in zap's testable examples. Uber-go Zap Zap 是非常快的、结构化的，分日志级别的Go日志库。 1. Apr 6, 2023 · This custom logger implementation in Go using the zap library demonstrates how to create a flexible and extensible logger with various log levels, custom formatting, and additional functionality. Use(sloggin. It does look a bit complex from a distance, but trust me as soon as you get close, it is really very easy. WithOptions(zap Dec 15, 2023 · Learn to boost your Go applications' performance with Zap Logger through this beginner-friendly guide. com Sep 15, 2025 · A Practitioner's Guide to Logging in Go with Zap For years, Go developers faced a choice when it came to logging: use the minimalist standard log package or adopt a more powerful, third-party library. It writes DebugLevel and above logs to standard out as JSON, but omits the timestamp and calling function to keep example output short and deterministic. The package has its origins in this GitHub discussion opened by Jonathan Amsterdam, which later led to the proposal describing the exact design of the package. Contribute to sandipb/zap-examples development by creating an account on GitHub. Jan 28, 2025 · Abstract Zap is a very fast, structured, and log-leveled Go logging library developed by Tagged with go, devops, ops, zap. Aug 23, 2023 · Creating a pretty console logger using Go's slog packageCreating a pretty console logger using Go's slog package Published 23 Aug 2023 2 Comments golang slog logging I had the privilege of attending GopherCon UK last week, and among the many captivating talks, one that stood out to me was "Structured Logging for the Standard Library" presented by Jonathan Amsterdam. Oct 6, 2025 · Go-simple project Building on our previous article, we plan to integrate the Zap logger into our simple Golang project structure in order to provide more efficient and structured logging. log. Jan 23, 2022 · I have been searching for examples of how to implement a database logger for uber-go. Contribute to uber-go/zap development by creating an account on GitHub. Old Logger Apr 1, 2025 · Overview Package ginzap provides log handling using zap package. Let's get started! Prerequisites Before following through with this See full list on golinuxcloud. RecoveryFunc) gin. Logger combines zapcore. SugaredLogger. Specific performance tests can be found on GitHub. Depending on the configuration of the zap logger, the program then panics after emitting the log message which is useful in development because such invalid log calls are bugs in the program. Logger Logger middleware logs the information about each HTTP request. Nov 9, 2025 · Discover the top Golang logging libraries in 2025, from standard packages like log and slog to advanced tools like Logrus, Zap, and Zerolog. Popular third-party logging libraries like Logrus, Zap, and Zerolog are detailed for their features and setup. Contribute to agoda-com/otelzap development by creating an account on GitHub. Feb 4, 2025 · Learn how to use Zap Logger effectively for clean, fast logs in your applications with this simple, comprehensive guide. 1. When implementing log rotation with Zap logger, we need to consider file size limits, rotation periods, and retention policies. Add the package to your go. go file contains functions for the following: newLoggerProvider: creates a logger provider, which collects and exports logs. trace_id and otel. Sugar() was omitted from the example — zap. 2. The log messages explain why a call was invalid (for example, non-string key). mod file: Set up a default logger. Sep 1, 2019 · You can set up your logger in the main function and call zap. Keep in mind that encoder is used on every Blazing fast, structured, leveled logging in Go. For the most part, concepts in Zap correspond directly with those in logr. It's safe to use concurrently. Logging is a crucial part of application development and maintenance. The providers. Datalog Log & Trace Correlation In the above screenshot you see an otel. span_id. context. The Go standard library Jun 22, 2024 · Zap is a high-performance logging library designed specifically for Go applications. ErrorLevel) sets the minimal zap logging level on which the span status is set to codes Jul 9, 2018 · The requested logging style would result in a mix of structured logging (json) and unstructured logging (all other fields in the console). uber. Oct 12, 2024 · } router. Dec 19, 2023 · There's probably a 99% chance that if you're logging in Go, you're using a third-party logging framework since the built-in log package lacks even the most basic features required for production logging. Sprintf. 21 where the new log/slog package for structured, leveled, and context-aware logging was one of the major highlights. Infof formats the objects according to fmt. LogSink implementation also implements logr. Let’s see how to use Zap from Uber! Sep 22, 2024 · sugar. RegisterEncoder to add your custom encoder and then set Encoding field in config to the name of your encoder. ReplaceGlobals to use it as a default global logger. otelzap. blackgreen's answer should make it possible, and it's a good hack, but the bigger problem here I think is that you are working against what zap has to offer (Blazing fast, structured, leveled logging in Go. In this part, Tagged with beginners, programming, tutorial, go. For example: You can customize your ECS logger. Logger doesn't have an Infof method. Dec 19, 2023 · We'll start with the basic setup of Zap in a Go program, then move on to detailed examples illustrating how to write and manage logs of various levels and formats. Emitting them is A simple logging interface for Go. Since then, I've been using Go to build many types of application, using several different A few reasons include that (1) engineers will accodentally instantiate a new logger, without that encoder, instead of reusing a centralized logger, (2) there will possibly be applications in other languages in a medium/large business (but since this is r/golang, let's ignore this for a moment). Jan 8, 2022 · featured image Table of Contents To log or not to log Go’s built-in logging package What is Level-Based Logging? Introducing “Uber Zap: Blazing fast, structured, leveled logging in Go How to configure uber-go/zap logger api to append logs to a specified file-path. zap logger example. 1. ReplaceGlobals replaces the global Logger and SugaredLogger, and returns a function to restore the original values. Can it be made to work like rolling file-appender (based on file-size or date) without affecting performance? Mar 27, 2022 · Core is a logging interface defined by zap, and as the name suggests, around this Core, zap provides upper-level logging objects and corresponding methods (zap. Jun 3, 2013 · Is there any good wrapper available for level based logging in golang? If not, how should I go about implementing one myself? What I want is pretty simple. yvv lowjx gakbki wglndy xewz uipd uhzch qndrrm glgjcx pgy iabgtj ldcq jjgbor hkck ivn