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Using Magento 2, I trying to retrieve the data (rating, nickname, ...) when the user write a review for a product. i want to retrieve this data, do some process and return back to be displayed in the screen.

How to grab this data inside the observer?

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As this event pass Action as a parameter of event , Then you can get all field values of the review form at Observer.

$controllerAction =  $observer->getEvent()->getControllerAction ();
   $nickname = $controllerAction->getRequest()->getParam('nickname', false);
   $title = $controllerAction->getRequest()->getParam('title', false);
   $detail = $controllerAction->getRequest()->getParam('detail', false);
   $ratings = $controllerAction->getRequest()->getParam('ratings', false)

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