Amazon DocumentDB is a fully managed native JSON document database that is mostly compatible with MongoDB. Why mostly? Because it it has a few functional differences from MongoDB and some MongoDB features are not supported. Despite from these limitation, customers benefit from a managed database service that has built-in security, backup integration, scalability and fault-tolerance. This rids customers from many operational burdens. AWS DMS (Database Migration Service) supports the migration from MongoDB to DocumentDB. Apart from the functional evaluation, pricing should of course be taken into consideration before migrating to DocumentDB as well.