Supported features: 4.0

The following tables include a breakdown of MongoDB 4.0 features supported by Firestore with MongoDB compatibility. For differences in behavior, see Behavior differences.

Query and projection operators

Firestore with MongoDB compatibility supports the following query and projection operators:

Array operators

Operator	Supported
`$all`	Yes
`$elemMatch`	Yes
`$size`	Yes

Bitwise operators

Operator	Supported
`$bitsAllClear`	No
`$bitsAllSet`	No
`$bitsAnyClear`	No
`$bitsAnySet`	No

Comment operator

Operator	Supported
`$comment`	No

Comparison operators

Operator	Supported
`$eq`	Yes
`$gt`	Yes
`$gte`	Yes
`$in`	Yes
`$lt`	Yes
`$lte`	Yes
`$ne`	Yes
`$nin`	Yes

Element operators

Operator	Supported
`$exists`	Yes
`$type`	Yes

Evaluation query operators

Operator	Supported
`$expr`	Yes
`$jsonSchema`	No
`$mod`	Yes
`$regex`	Yes
`$text`	Yes
`$where`	No

Logical operators

Operator	Supported
`$and`	Yes
`$nor`	Yes
`$not`	Yes
`$or`	Yes

Projection operators

Operator	Supported
`$`	Yes
`$elemMatch`	Yes
`$meta`	Partial (supports `textScore`)
`$slice`	Yes

Update operators

Firestore with MongoDB compatibility supports the following update operators.

Array operators

Operator	Supported
`$`	Yes
`$[]`	Yes
`$[<identifier>]`	Yes
`$addToSet`	Yes
`$pop`	Yes
`$pull`	Yes
`$pullAll`	Yes
`$push`	Yes

Bitwise operators

Operator	Supported
`$bit`	Yes

Field operators

Operator	Supported
`$currentDate`	Yes
`$inc`	Yes
`$max`	Yes
`$min`	Yes
`$mul`	Yes
`$rename`	Yes
`$setOnInsert`	Yes

Update modifiers

Modifier	Supported
`$each`	Yes
`$position`	Yes
`$slice`	Yes
`$sort`	Yes

Aggregation pipeline operators

Firestore with MongoDB compatibility supports the following aggregation pipeline operators.

Accumulators

Expression	Supported
`$addToSet`	Yes
`$avg`	Yes
`$first`	Yes
`$last`	Yes
`$max`	Yes
`$mergeObjects`	Yes
`$min`	Yes
`$push`	Yes
`$stdDevPop`	No
`$stdDevSamp`	No
`$sum`	Yes

Accumulator expressions

Expression	Supported
`$avg`	Yes
`$first`	Yes
`$last`	Yes
`$max`	Yes
`$min`	Yes
`$stdDevPop`	No
`$stdDevSamp`	No
`$sum`	Yes

Arithmetic operators

Limitations: Arithmetic operators don't support decimal128 values.

Operator	Supported
`$abs`	Yes
`$add`	Yes
`$ceil`	Yes
`$divide`	Yes
`$exp`	Yes
`$floor`	Yes
`$ln`	Yes
`$log`	Yes
`$log10`	Yes
`$mod`	Yes
`$multiply`	Yes
`$pow`	Yes
`$sqrt`	Yes
`$subtract`	Yes
`$trunc`	Yes

Array operators

Operator	Supported
`$arrayElemAt`	Yes
`$arrayToObject`	Yes
`$concatArrays`	Yes
`$filter`	Yes
`$firstN`	Yes
`$in`	Yes
`$indexOfArray`	Yes
`$isArray`	Yes
`$map`	Yes
`$objectToArray`	Yes
`$range`	Yes
`$reduce`	Yes
`$reverseArray`	Yes
`$size`	Yes
`$slice`	Yes
`$zip`	Yes

Boolean operators

Operator	Supported
`$and`	Yes
`$not`	Yes
`$or`	Yes

Comparison operators

Operator	Supported
`$cmp`	Yes
`$eq`	Yes
`$gt`	Yes
`$gte`	Yes
`$lt`	Yes
`$lte`	Yes
`$ne`	Yes

Conditional expression operators

Operator	Supported
`$cond`	Yes
`$ifNull`	Yes
`$switch`	Yes

Date operators

Operator	Supported
`$dateFromParts`	Yes
`$dateFromString`	Yes
`$dateToParts`	Yes
`$dateToString`	Yes
`$dayOfMonth`	Yes
`$dayOfWeek`	Yes
`$dayOfYear`	Yes
`$hour`	Yes
`$isoDayOfWeek`	Yes
`$isoWeek`	Yes
`$isoWeekYear`	Yes
`$millisecond`	Yes
`$minute`	Yes
`$month`	Yes
`$second`	Yes
`$toDate`	Yes
`$week`	Yes
`$year`	Yes

Miscellaneous operators

Operator	Supported
`$natural`	Yes (ascending)
`$toHashedIndexKey`	No

Literal expression operators

Operator	Supported
`$literal`	Yes

Object operators

Operator	Supported
`$mergeObjects`	Yes
`$objectToArray`	Yes

Set operators

Operator	Supported
`$allElementsTrue`	Yes
`$anyElementTrue`	Yes
`$setDifference`	Yes
`$setEquals`	Yes
`$setIntersection`	Yes
`$setIsSubset`	Yes
`$setUnion`	Yes

Stage operators

Operator	Supported
`$addFields`	Yes
`$bucket`	Yes
`$bucketAuto`	No
`$collStats`	No
`$count`	Yes
`$currentOp`	No
`$facet`	Yes
`$geoNear`	No
`$graphLookup`	No
`$group`	Yes
`$indexStats`	No
`$limit`	Yes
`$listLocalSessions`	No
`$listSessions`	No
`$lookup`	Yes
`$match`	Yes
`$out`	No
`$project`	Yes
`$redact`	No
`$replaceRoot`	Yes
`$sample`	Yes
`$set`	Yes
`$skip`	Yes
`$sort`	Yes
`$sortByCount`	Yes
`$unset`	Yes
`$unwind`	Yes

String operators

Operator	Supported
`$concat`	Yes
`$dateFromString`	Yes
`$dateToString`	Yes
`$indexOfBytes`	Yes
`$indexOfCP`	Yes
`$ltrim`	Yes
`$rtrim`	Yes
`$split`	Yes
`$strcasecmp`	Yes
`$strLenBytes`	Yes
`$strLenCP`	Yes
`$substr`	Yes
`$substrBytes`	Yes
`$substrCP`	Yes
`$toLower`	Yes
`$toString`	Yes
`$toUpper`	Yes
`$trim`	Yes

System variables

Variable	Supported
`$$CURRENT`	No
`$$DESCEND`	No
`$$KEEP`	No
`$$PRUNE`	No
`$$REMOVE`	Yes
`$$ROOT`	Yes

Text operators

Operator	Supported
`$meta`	Yes

Type operators

Operator	Supported
`$convert`	Yes
`$toBool`	Yes
`$toDate`	Yes
`$toDecimal`	Yes
`$toDouble`	Yes
`$toInt`	Yes
`$toLong`	Yes
`$toObjectId`	Yes
`$toString`	Yes
`$type`	Yes

Variable operators

Operator	Supported
`$let`	Yes

Geospatial

Firestore with MongoDB compatibility supports the following Geospatial operators.

Geometry specifiers

Specifier	Supported
`$box`	No
`$center`	No
`$centerSphere`	No
`$geometry`	No
`$maxDistance`	No
`$minDistance`	No
`$polygon`	No
`$uniqueDocs`	No

Query selectors

Selector	Supported
`$geoIntersects`	No
`$geoWithin`	No
`$near`	Yes
`$nearSphere`	No
`$nearSphere`	No
`$uniqueDocs`	No

Indexes and index properties

Firestore with MongoDB compatibility supports the following indexes and index operators.

Indexes

Index type	Supported
2d	No
2dsphere	Yes
Compound	Yes
Hashed	No
Multikey	Yes
Single Field	Yes
Text	Yes

Index properties

Property	Supported
Background	Yes
Case Insensitive	No
Partial	No
Non-Sparse	Yes
Sparse	Yes
Text	Yes
TTL	Yes
Unique	Yes

Database commands

Firestore with MongoDB compatibility supports the following database commands.

Aggregation

Command	Supported
`aggregate`	Yes
`count`	Yes
`distinct`	Yes
`group`	No The `$group` stage in aggregations is supported whereas the group command isn't.
`mapReduce`	No

Authentication

Command	Supported
`authenticate`	No
`getnonce`	No
`logout`	No

Query and write operations

Command	Supported
`watch` (Change Streams)	No
`delete`	Yes
`eval`	No
`find`	Yes
`findAndModify`	Yes
`getLastError`	Yes
`getMore`	Yes
`getPrevError`	No
`GridFS`	No
`insert`	Yes
`parallelCollectionScan`	No
`replaceOne`	No The `replaceOne` driver method is supported with the `update` command.
`resetError`	No
`update`	Yes

Session commands

Command	Supported
`abortTransaction`	Yes
`commitTransaction`	Yes
`endSessions`	Yes
`killAllSessions`	No
`killAllSessionsByPattern`	No
`killSessions`	No
`refreshSessions`	No
`startSession`	Sessions can be started using the `startSession` driver method.

Administrative commands

Firestore with MongoDB compatibility supports the following administrative commands.

Command	Supported
`cloneCollectionAsCapped`	No
`collMod`	No
`collMod: expireAfterSeconds`	No
`convertToCapped`	No
`copydb`	No
`create`	Yes
`createIndex`	Yes
`createIndexes`	Yes
`createView`	No
`currentOp`	No
`drop`	Yes
`dropDatabase`	No To delete a database, see Delete a database.
`dropIndex`	Yes To delete indexes, see Manage indexes.
`dropIndexes`	No
`filemd5`	No
`killCursors`	Yes
`killOp`	No
`listCollections`	Yes
`listDatabases`	Yes
`listIndexes`	Yes
`reIndex`	No
`renameCollection`	No
`setAuditConfig`	No

Diagnostic commands

Command	Supported
`buildInfo`	Yes
`collStats`	No
`connectionStatus`	Yes
`connPoolStats`	No
`dataSize`	No
`dbHash`	No
`dbStats`	No
`explain`	Yes For behavior differences and limitations, see Query Explain
`features`	No
`hostInfo`	Yes
`listCommands`	No
`profiler`	No
`serverStatus`	No
`top`	No
`whatsmyuri`	No

Role management commands

To manage database access, Firestore with MongoDB compatibility supports Identity and Access Management roles and permissions.

Command	Supported
`createRole`	No
`dropAllRolesFromDatabase`	No
`dropRole`	No
`grantRolesToRole`	No
`revokePrivilegesFromRole`	No
`revokeRolesFromRole`	No
`rolesInfo`	No
`updateRole`	No

What's next

Run the Quickstart: Create a database and connect to it.
Learn about Behavior differences.