The composer require command can help you get your requirements into composer.json more easily. However, that ease is more theoretical than actual for modules without a full stable release.
The Honeypot module has a full stable release version, so any of these will work:
composer require drupal/honeypot:8.*
composer require drupal/honeypot:8.x
composer require drupal/honeypot:8
composer require drupal/honeypot
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