developers

Key features:

• Kint (enable kint submodule, for pretty variable printing, way to view properties and methods)
• DevelMailLog (redirect all mail to text files instead, specify location directory, specify filenames using tokens for recipient, subject, timestamp) - DevelMailLog requires that you also install the MailSystem module to activate it
• Config Editor and State Editor (enable via /admin/config/development/devel/toolbar)

Add a UI to easily create scaffolding for new modules (including hooks, plugins, permissions etc.) NB: first, you need to download drupal-code-builder from GitHub and place it in a /libraries top-level directory (see module builder's README.txt).   You can preview and edit the output files before writing to disk - and each module's configuration is saved  as a node, so you can add another hook etc. at a later date, regenerate the files and copy/paste the extra things you need. Video walkthrough.

Install the devel module first.  The profile is a toolbar at the bottom of the screen. Features:

• useful shortcuts (e.g. clear cache)
• view info about current user, their role and permissions
• server HTTP response
• cache, DB and DOM loading performance
• memory use
• which blocks and views have been loaded

Tip: there are further reports ("collectors") you can turn on in the module preferences, and there's a shortcut to these from the menu in the first icon (Drupal logo). The toolbar is only a summary, all icons are clickable to view a full report. Each report is saved in the DB for later reading.

This module was ported from Symfony

Provides:

• /admin/reports/fields/tools - new Tools tab contains a more detailed field list that lists the instances (e.g. entities/content types) where each field is in use
• editing individual fields in a content type - new Clone tab which will let you copy it to other Bundles (it also copies form and view display options)
• Manage Fields page of a content type - new Clone tab where you can selectively clone multiple:
  • fields
  • displays
  • copy display settings

Use Xdebug breakpoints in Twig templates - {{ breakpoint() }}