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I don't think of Flask as a framework, but rather a library. It is lightweight.
Django, on the other side, is a full fledged framework with a whole lot of features. We are talking ORM, server side rendering, REST and Web features.
Flask will not solve any issue regarding MongoDB, but you can get a library there and work with that. Django, AFAIK, does not work well with Mongo.
I would stick with Flask if you just want a REST API, without UI. And I also recommend connexion.
I don't think of Flask as a framework, but rather a library. It is lightweight.
Django, on the other side, is a full fledged framework with a whole lot of features. We are talking ORM, server side rendering, REST and Web features.
Flask will not solve any issue regarding MongoDB, but you can get a library there and work with that. Django, AFAIK, does not work well with Mongo.
I would stick with Flask if you just want a REST API, without UI. And I also recommend connexion.