Compatibility Changes in MongoDB 8.1
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Warning
MongoDB 8.1 Not Yet Available
MongoDB 8.1 release candidates are not yet available. This version of the manual is for an upcoming release and is currently a work in progress.
Important
MongoDB 8.1 is a rapid release and is only supported for MongoDB Atlas. MongoDB 8.1 is not supported for use on-premises. For more information, see MongoDB Versioning.
To install the latest MongoDB version supported for on-premises use, MongoDB 8.0, see the MongoDB 8.0 installation instructions.
Backward-Incompatible Features
General Changes
Subtype Conversion
Starting in MongoDB 8.1, $convert returns an error when attempting
to convert between different binData subtypes. In MongoDB 8.0,
$convert returns the original value and original subtype: no
conversion is performed. MongoDB versions before 8.0 don't have binData
conversion.