Evaluation Query Operators

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