Best answer by david_r
currently, FME doesn't seem to have any native MongoDb reader/writer. But it should be relatively easy to let FME interact with your database using the PythonCreator (as reader) and PythonCaller (as writer) with the PyMongo (http://api.mongodb.org/python/2.7.2/) module.
An alternative could be the REST api (http://docs.mongolab.com/restapi/) using the HTTPFetcher/HTTPDeleter.
David
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