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Home/ Questions/Q 6948781
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Editorial Team
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Editorial Team
Asked: May 27, 20262026-05-27T13:52:05+00:00 2026-05-27T13:52:05+00:00

What are the major differences between Rails 3 built-in logger and Log4r? It seems

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What are the major differences between Rails 3 built-in logger and Log4r? It seems to me that Rails 3 logger gives you everything that you need.

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  1. Editorial Team
    Editorial Team
    2026-05-27T13:52:05+00:00Added an answer on May 27, 2026 at 1:52 pm

    Built-in logger is good enough for both development or production environment. especially at the very beginning stages of your project, you don’t need to waste time to testing and choose an appropriate tool or library to do the logger job. You can concentrate on the project itself. the simliar situation like “erb” or “haml”, “sass” or “less”, “coffeescript” or “plain javascript”, etc…

    Log4r allow you to format your logs easily through configuration file. its a good built-in logger alternator when you real need it.

    http://log4r.rubyforge.org/

    What Log4r Is

    Log4r is a comprehensive and flexible logging library written in Ruby
    for use in Ruby programs. It features a hierarchical logging system of
    any number of levels, custom level names, logger inheritance, multiple
    output destinations, execution tracing, custom formatting, thread
    safteyness, XML and YAML configuration, and more. Log4r is an adherent
    to the philosophy of logging using simple print statements. What Log4r
    adds to this philosophy is a flexible way of controling the
    information being logged. Log information can be sent to any kind of
    destination and with varying degrees of importance. Log4r is designed
    so that logging statements can remain in production code with almost
    no extra computational cost.

    Log4r intends to be easy to use and configure, no matter the
    complexity. Casual scripts can use Log4r right away with minimal
    configuration, while more sophisticated applications can set up a
    structured configuration file in XML or YAML. Comprehensive
    documentation is provided, with a user’s manual, a reference API, and
    over a dozen examples. Log4r attempts to abide by the Principle of
    Least Surprise, which means that it works as intended at all points.

    Log4r was inspired by and provides much of the features of the Apache
    Log4j project, but is not a direct implementation or clone. Aside from
    superficial similarities, the projects are not related in any way and
    the code base is completely distinct. Log4r was developed without even
    looking at the Apache Log4j code.

    Log4r is an Open Source project and intends to remain that way. The
    Log4r license is similar to the Ruby Language license. It resides on
    this page and in the distribution in a file named LICENSE.

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