MongoDB Query Operators
There are many query operators that can be used to compare and reference document fields.
Comparison
The following operators can be used in queries to compare values:
$eq: Values are equal$ne: Values are not equal$gt: Value is greater than another value$gte: Value is greater than or equal to another value$lt: Value is less than another value$lte: Value is less than or equal to another value$in: Value is matched within an array
Logical
The following operators can logically compare multiple queries.
$and: Returns documents where both queries match$or: Returns documents where either query matches$nor: Returns documents where both queries fail to match$not: Returns documents where the query does not match
Evaluation
The following operators assist in evaluating documents.
$regex: Allows the use of regular expressions when evaluating field values$text: Performs a text search$where: Uses a JavaScript expression to match documents
