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Development Mode

With Development Mode, features that do not require a connection to WordPress.com servers can be activated on a localhost WordPress installation for testing.

You can turn on Development Mode by adding define( 'JETPACK_DEV_DEBUG', true); to your wp-config.php file.

Development mode automatically gets enabled if you don’t have a period in your site’s hostname, i.e. localhost. If you use a different URL, such as mycooltestsite.local or something, then you will need to define the JETPACK_DEV_DEBUG constant.

You can also enable Jetpack’s development mode through a plugin, thanks to the jetpack_development_mode filter:

add_filter( 'jetpack_development_mode', '__return_true' );
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