Web Reference: MongoDB uses a flexible schema model, which means that documents in a collection do not need to have the same fields or data types by default. Once you've established an application schema, you can use schema validation to ensure there are no unintended schema changes or improper data types. Aug 19, 2025 · It allows you to define your MongoDB collection schemas declaratively with Python classes, while supporting advanced typing features like Annotated, Literal, Union, custom validation markers, and nested models. Oct 4, 2017 · I am trying to validate an inserted document against a schema, and was trying to find a way to validate the inserted document. There are libraries like MongoEngine that say they do the work, but is there a way to do document validation directly via pymongo ?
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