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Still new to Drupal, but I've read over the docs countless times and can't figure this out. I'm not seeing Twig's debug comments. I am using a sub-theme of 'Bootstrap 3'. Running on local environment in Windows (XAMPP).

In /sites/default/services.yml 

debug: true
auto_reload: true
cache: false

I've cleared the cache more times than I can count. I've also tried, unsuccessfully, making various changes to settings.php as well, however since these changes aren't in the docs I'm guessing they shouldn't be required for enabling debug statements.

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8 Answers 8

Reset to default
4

go to sites/default/services.yml

and write in the proper indentation with spaces as below..

parameters:
  twig.config:
    debug : true
    auto_reload: true
    cache: false

*remember to follow the same structure as above

If not working clear cache from back-office :
http://your-drupal.com/admin/config/development/performance

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7
  • Removed the default documentation above the statements, but it revealed the indentation level was correct. No debug statements still an issue. Commented May 11, 2016 at 19:26
  • 1
    go to sites and make a file development.services.yml and write the above code and c if it works @JonCarlyon Commented May 11, 2016 at 19:33
  • 1
    Adding settings.local.php to /sites/default/ did it for me. Does this means there is likely an issue in settings.php? Thanks for the help wouldn't have gotten this today without ya. Commented May 11, 2016 at 20:02
  • 2
    For those still struggling, the sites/development.services.yml file fixed the issue for me, after trying everything else. Would be useful if that could be incorporated into the answer. Commented Apr 18, 2017 at 20:02
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    How is this the accepted answer, when all it does is repeat the OP's the set up? Commented Feb 25, 2020 at 14:18
4

I had the same problem. I installed a fresh version of Drupal 8.55 and Bootstrap Theme. Modifying the services.yml didnt work. So I made a search for the word debug and find this file:

core/core.servicies.yml. I Modify this part and it work's

twig.config: debug: true

Somehow that file is taking precedence after services.yml.

Hope this help someone, but it's not really the best answer because we are modifying the core of drupal here.

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1
  • 1
    This works for me as well!! Commented Oct 9, 2019 at 14:37
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According to Drupal documentation, the advised method is to copy settings.local.php from sites/ to sites/default, then enable it by uncommenting this in your settings.php:

if (file_exists($app_root . '/' . $site_path . '/settings.local.php')) {
  include $app_root . '/' . $site_path . '/settings.local.php';
}

Then, add this to your settings.local.php:

$settings['container_yamls'][] = DRUPAL_ROOT . '/sites/development.services.yml';

(You can also copy development.services.yml, if you want).

Add this to your development.services.yml:

parameters:
  twig.config:
    debug: true
    auto_reload: true
    cache: false

Then, run drush cr. After this, you should see your Twig debugging.

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1
  • This is not working for me. Commented Apr 6, 2020 at 17:35
1

In Drupal 8.8, I needed to do this:

  1. copy /sites/example.local.settings.php to /sites/default/local.settings.php to enable local development services (this file enable those services by default).
  2. copy /sites/default/default.services.yml to /sites/default/services.yml and change twig debug settings i the twig.config: section (starting at line 39): debug: true auto_reload: true auto_reload: true
  3. run rebuild.php (this rebuilds caches). drush cr should work too.

I got there after trying many variations of the above answers. Apparently adding the "parameters: twig.config:" (etc) to the development.services.yml file is no longer necessary, as those parameters are now set in /sites/default/services.yml.

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0

Try enabling it manually in your site instance.

In /sites/yoursite/services.yml:

twig.config:
  debug: true
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2
  • should /yoursite/ be the name of my sub theme? Commented May 11, 2016 at 19:04
  • It's not theme specific, but site specific; so, /sites/default for most cases, or /sites/yoursite if you're doing multisite or otherwise being more specific. Commented Oct 24, 2018 at 15:49
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If you have a multiste installation,

  1. Copy /sites/development.services.yml to your subsite folder
  2. Rename it to be services.yml
  3. Open your settings.php and find the following line:

$settings['container_yamls'][] = DRUPAL_ROOT . '/sites/development.services.yml';

  1. Under that line add:

$settings['container_yamls'][] = DRUPAL_ROOT . '/sites/YOUR_SITE>/services.yml';

  1. Save your settings.php
  2. Rebuild your caches (drush cr) and now Drupal will be aware of your configuration changes in services.yml file
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0

If you copy default.services.yml in sites/default to services.yml, you will see the twig debug parameter is already in there, set to false. I didn't see this, and added the parameters/twig/debug: true at the bottom of the file. That didn't work, and no wonder.

The twig.config section in my services.yml starts at line 35, and the parameters you want are under that. This, in 8.7.

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0

I had the same issue and confusion was with the sites/default/services.yml file. I was editing the default.services.yml file and did not have a services.yml file.

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