You can start by asking librarians. They are very knowledgeable about books for different age groups and can recommend some great middle grade novels. Another way is to check online book review platforms like Goodreads. There, you can see ratings and reviews from other readers. Also, looking at award - winning lists for children's literature can be helpful as books that have won awards like the Newbery Medal are often excellent middle grade novels.
One way to find the best middle grade novels is to ask teachers. They deal with kids of that age group all the time and are familiar with books that are both engaging and educational. Look for book fairs too, especially those focused on children's literature. There you can discover new and popular middle grade novels. You might also consider looking at books that have been made into movies or TV shows for kids, as often these are based on great middle grade novels.
To find the best middle grade novels, you could join a book club for kids or parents of kids. People in the club can share their favorite reads. You can also visit your local bookstore and browse the middle grade section. Read the back covers and first few pages of books that catch your eye. Additionally, follow children's book authors on social media. They often promote their own books as well as other great middle grade novels in the genre.