$titlecase

Update records by converting a string column to title case format. The $titlecase method is used to modify text fields by capitalizing the first letter of each word in a string, while keeping the rest of the letters in lowercase (e.g., “Hello World”). This is useful for formatting titles, headings, or names where title case is preferred.

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