WooCommerce 3 introduced a new format to structured product data called JSON/LD. Despite the fact that this improvement is a huge step forward, some people asked how to remove it.

From our official post release:

Previously, structured data was output inline in our template files (marking up things such as products). In 3.0 we’ve switched to JSON-LD format which keeps our template files tidy and keeps data intact if customizations are made by theme developers.

But for some reason you might be tempted to remove this method that adds some javascript to your page source code. To do so, use this code:

if ( class_exists( 'WooCommerce' ) ):
function osc_remove_output_structured_data() {
remove_action( 'wp_footer', array( WC()->structured_data, 'output_structured_data' ), 10 );
}
add_action( 'init', 'osc_remove_output_structured_data' );
endif;