From Costa Sano MediaWiki
| Command
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Description
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composer --version
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Show the installed Composer version.
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composer install
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Install all dependencies listed in composer.json (used after cloning a project).
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composer update
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Update all dependencies to the latest allowed versions.
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composer update drupal/core --with-all-dependencies
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Update Drupal core and all related packages.
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composer require drupal/<module>
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Download and add a Drupal module to the project.
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composer require drupal/<theme>
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Download and add a Drupal theme to the project.
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composer remove drupal/<module>
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Remove a module from the codebase (does not uninstall it in Drupal).
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composer show
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List all installed Composer packages.
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composer show drupal/<package>
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Show details about a specific Drupal package.
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composer outdated
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List packages with newer versions available.
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composer validate
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Validate the composer.json file for syntax and structure.
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composer dump-autoload -o
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Rebuild the autoloader with optimization (useful after file changes).
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composer create-project drupal/recommended-project mysite
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Create a new Drupal project using the recommended template.
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composer config
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Show or modify Composer configuration settings.
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composer clear-cache
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Clear Composer’s internal cache.
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