Evaluation Query Operators

This version of the documentation is archived and no longer supported. To upgrade your 5.0 deployment, see the MongoDB 6.0 upgrade procedures.

Evaluation operators return data based on evaluations of either individual fields or the entire collection's documents.

Note

For details on a specific operator, including syntax and examples, click on the link to the operator's reference page.

Name	Description
`$expr`	Allows use of aggregation expressions within the query language.
`$jsonSchema`	Validate documents against the given JSON Schema.
`$mod`	Performs a modulo operation on the value of a field and selects documents with a specified result.
`$regex`	Selects documents where values match a specified regular expression.
`$where`	Matches documents that satisfy a JavaScript expression.

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$type

$expr