Appian compatible with MongoDB

MongoDB is not supported. Take a look at system requirements @ docs.appian.com/.../System_Requirements.html . MySQL, Oracle, SQL Server and IBM DB2 are supported.

It's not compatible in the sense that it is not supported. But, you can create a connector for mongoDB. This will require that you create a custom plugin. The plugin should be able to read and write data to/from MongoDB. The interface to the connector should be similar to Write to Datastore and query entity. And you will also need utilities to convert between structured data (CDTs in Appian) to unstructured data (arbitrary Json with arbitrary number of attributes in it).. you will need the database driver for mongoDB with the Java bindings.

Or just use the OOTB HTTP enterface. Talking to REST interfaces in Appian is pretty simple. docs.mongodb.com/.../

@Stefan, yes that's a good and easier option. Checked the link - the RESTHeart for Java looks like a good option.

Please share your use case with Appian, either on the Forum here or confidentially through a support case enhancement request.

Thanks all for the feedback, we will use the REST interface to talk to MongoDB from Appian.