DocumentDB is a MongoDB-compatible document database based on PostgreSQL from Microsoft and already used to power the Azure Cosmos DB database. Earlier this year, Microsoft open-sourced DocumentDB to provide a fully open-source, MongoDB-compatible document database.
To everyone's surprise, Microsoft released DocumentDB under the more permissive MIT license, which allows developers and organizations to integrate it into their solutions without restrictions. Within a week of open-sourced development, the DocumentDB project had 1000 stars on GitHub, 50 forks, and a ton of pull requests.





