Install via composer :

composer require drupal/<module>
composer require "<vendor>/<package>:<version>"
exp : composer require "drupal/pathauto:^1.0"

 

What happpened after this command ?

These lines added to composer.json file

 

"require": {
    ...
    "drupal/recaptcha": "^2.3"
},

 

Uninstall via composer :

composer remove drupal/pathauto