zap VS go-cmp

Compare zap vs go-cmp and see what are their differences.

zap

Blazing fast, structured, leveled logging in Go. (by uber-go)

go-cmp

Package for comparing Go values in tests (by google)
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zap go-cmp
51 7
20,762 3,935
1.6% 1.3%
8.1 3.7
about 21 hours ago 3 months ago
Go Go
MIT License BSD 3-clause "New" or "Revised" License
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.

zap

Posts with mentions or reviews of zap. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-09-27.
  • Building RESTful API with Hexagonal Architecture in Go
    21 projects | dev.to | 27 Sep 2023
    The project currently uses slog package from standard library for logging. But switching to a more advanced logger like zap could offer more flexibility and features.
  • Structured Logging with Slog
    11 projects | news.ycombinator.com | 22 Aug 2023
    It's nice to have this in the standard library, but it doesn't solve any existing pain points around structured log metadata and contexts. We use zap [0] and store a zap logger on the request context which allows different parts of the request pipeline to log with things like tenantid, traceId, and correlationId automatically appended. But getting a logger off the context is annoying, leads to inconsistent logging practices, and creates a logger dependency throughout most of our Go code.

    [0] https://github.com/uber-go/zap

    11 projects | news.ycombinator.com | 22 Aug 2023
    Oof. We just converted all of our logging to zap[0] to get structured JSON logging for downstream parsing. Wonder how the perf stacks up.

    [0]: https://github.com/uber-go/zap

  • Kubebuilder Tips and Tricks
    2 projects | dev.to | 22 Aug 2023
    Kubebuilder, like much of the k8s ecosystem, utilizes zap for logging. Out of the box, the Kubebuilder zap configuration outputs a timestamp for each log, which gets formatted using scientific notation. This makes it difficult for me to read the time of an event just by glancing at it. Personally, I prefer ISO 8601, so let's change it!
  • Go 1.21 Released
    7 projects | news.ycombinator.com | 8 Aug 2023
    What else would you expect from a structured logging package?

    To me it absolutely makes sense as the default and standard for 99% of applications, and the API isn't much unlike something like Zap[0] (a popular Go structured logger).

    The attributes aren't an "arbitrary" concept, they're a completely normal concept for structured loggers. Groups are maybe less standard, but reasonable nevertheless.

    I'm not sure if you're aware that this is specifically a structured logging package. There already is a "simple" logging package[1] in the sodlib, and has been for ages, and isn't particularly fast either to my knowledge. If you want really fast you take a library (which would also make sure to optimize allocations heavily).

    [0]: https://pkg.go.dev/go.uber.org/zap

    [1]: https://pkg.go.dev/log

  • Why elixir over Golang
    10 projects | /r/elixir | 29 May 2023
    And finally for structured logging: https://github.com/uber-go/zap
  • Beginner-friendly API made with Go following hexagonal architecture.
    5 projects | /r/golang | 21 May 2023
    For logging: I recommend using Uber Zap https://github.com/uber-go/zap It will log stack backtraces and makes it super easy to debug errors when deployed. I typically log in the business logic and not below. And log at the entry for failures to start the system. Maybe not necessary for this example, but it’s an essential piece of any API backend.
  • slogx - slog package extensions and middlewares
    3 projects | /r/golang | 1 May 2023
  • Why it is so weirdo??
    2 projects | /r/ProgrammerHumor | 22 Mar 2023
  • What is the common log library which is industry standard that is used in server applications?
    5 projects | /r/golang | 21 Mar 2023

go-cmp

Posts with mentions or reviews of go-cmp. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2022-11-03.

What are some alternatives?

When comparing zap and go-cmp you can also consider the following projects:

logrus - Structured, pluggable logging for Go.

zerolog - Zero Allocation JSON Logger

slog

glog - Leveled execution logs for Go

Testify - A toolkit with common assertions and mocks that plays nicely with the standard library

go-log - a golang log lib supports level and multi handlers

log - Structured logging package for Go.

lumberjack - lumberjack is a log rolling package for Go

Gin - Gin is a HTTP web framework written in Go (Golang). It features a Martini-like API with much better performance -- up to 40 times faster. If you need smashing performance, get yourself some Gin.

seelog - Seelog is a native Go logging library that provides flexible asynchronous dispatching, filtering, and formatting.

go-grpc-middleware - Golang gRPC Middlewares: interceptor chaining, auth, logging, retries and more.

log15 - Structured, composable logging for Go