Skip to content
  • About
    • What is Symfony?
    • Community
    • News
    • Contributing
    • Support
  • Documentation
    • Symfony Docs
    • Symfony Book
    • Screencasts
    • Symfony Bundles
    • Symfony Cloud
    • Training
  • Services
    • Platform.sh for Symfony Best platform to deploy Symfony apps
    • SymfonyInsight Automatic quality checks for your apps
    • Symfony Certification Prove your knowledge and boost your career
    • SensioLabs Professional services to help you with Symfony
    • Blackfire Profile and monitor performance of your apps
  • Other
  • Blog
  • Download
sponsored by
  1. Home
  2. Documentation
  3. Logging
  4. How to Define a Custom Logging Formatter
  • Documentation
  • Book
  • Reference
  • Bundles
  • Cloud

How to Define a Custom Logging Formatter

Edit this page

Warning: You are browsing the documentation for Symfony 2.7, which is no longer maintained.

Read the updated version of this page for Symfony 6.3 (the current stable version).

How to Define a Custom Logging Formatter

Each logging handler uses a Formatter to format the record before logging it. All Monolog handlers use an instance of Monolog\Formatter\LineFormatter by default but you can replace it easily. Your formatter must implement Monolog\Formatter\FormatterInterface.

1
2
3
4
5
6
7
8
9
10
# app/config/config.yml
services:
    my_formatter:
        class: Monolog\Formatter\JsonFormatter
monolog:
    handlers:
        file:
            type: stream
            level: debug
            formatter: my_formatter
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
<!-- app/config/config.xml -->
<?xml version="1.0" encoding="UTF-8" ?>
<container xmlns="http://symfony.com/schema/dic/services"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:monolog="http://symfony.com/schema/dic/monolog"
    xsi:schemaLocation="http://symfony.com/schema/dic/services
        http://symfony.com/schema/dic/services/services-1.0.xsd
        http://symfony.com/schema/dic/monolog
        http://symfony.com/schema/dic/monolog/monolog-1.0.xsd">

    <services>
        <service id="my_formatter" class="Monolog\Formatter\JsonFormatter" />
    </services>

    <monolog:config>
        <monolog:handler
            name="file"
            type="stream"
            level="debug"
            formatter="my_formatter"
        />
    </monolog:config>
</container>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
// app/config/config.php
use Monolog\Formatter\JsonFormatter;

$container->register('my_formatter', JsonFormatter::class);

$container->loadFromExtension('monolog', array(
    'handlers' => array(
        'file' => array(
            'type'      => 'stream',
            'level'     => 'debug',
            'formatter' => 'my_formatter',
        ),
    ),
));
This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.
TOC
    Version
    We stand with Ukraine.
    Version:
    Become certified from home

    Become certified from home

    Symfony Code Performance Profiling

    Symfony Code Performance Profiling

    Symfony footer

    ↓ Our footer now uses the colors of the Ukrainian flag because Symfony stands with the people of Ukraine.

    Avatar of Denys Voronin, a Symfony contributor

    Thanks Denys Voronin (@hurricane) for being a Symfony contributor

    2 commits • 20 lines changed

    View all contributors that help us make Symfony

    Become a Symfony contributor

    Be an active part of the community and contribute ideas, code and bug fixes. Both experts and newcomers are welcome.

    Learn how to contribute

    Symfony™ is a trademark of Symfony SAS. All rights reserved.

    • What is Symfony?

      • Symfony at a Glance
      • Symfony Components
      • Case Studies
      • Symfony Releases
      • Security Policy
      • Logo & Screenshots
      • Trademark & Licenses
      • symfony1 Legacy
    • Learn Symfony

      • Symfony Docs
      • Symfony Book
      • Reference
      • Bundles
      • Best Practices
      • Training
      • eLearning Platform
      • Certification
    • Screencasts

      • Learn Symfony
      • Learn PHP
      • Learn JavaScript
      • Learn Drupal
      • Learn RESTful APIs
    • Community

      • SymfonyConnect
      • Support
      • How to be Involved
      • Code of Conduct
      • Events & Meetups
      • Projects using Symfony
      • Downloads Stats
      • Contributors
      • Backers
    • Blog

      • Events & Meetups
      • A week of symfony
      • Case studies
      • Cloud
      • Community
      • Conferences
      • Diversity
      • Documentation
      • Living on the edge
      • Releases
      • Security Advisories
      • SymfonyInsight
      • Twig
      • SensioLabs
    • Services

      • SensioLabs services
      • Train developers
      • Manage your project quality
      • Improve your project performance
      • Host Symfony projects

      Deployed on

    Follow Symfony

    Search by Meilisearch