$uppercase

Update records by converting all characters in a string column to uppercase. The $uppercase method is used to modify text fields by making all characters in a string uppercase, ensuring consistent formatting or standardizing text data for easier comparison and display.

await Member.$update({
    $where: { 
        age: { 
            $eq: 16 
        } 
    },
    $update: {
       $uppercase: {
         username: true
       }
    }
});