<br />

The following tables include a breakdown of MongoDB 3.6 features supported by Cloud Firestore. For differences in behavior, see [Behavior differences](https://firebase.google.com/docs/firestore/enterprise/behavior-differences).

<br />

## Query and projection operators

Cloud Firestore 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 |
| `$text` | No |
| `$where` | No |

### Logical operators

| **Operator** | **Supported** |
|---|---|
| `$and` | Yes |
| `$nor` | Yes |
| `$not` | Yes |
| `$or` | Yes |

### Projection operators

| **Operator** | **Supported** |
|---|---|
| `$` | Yes |
| `$elemMatch` | Yes |
| `$meta` | No |
| `$slice` | Yes |

## Update operators

Cloud Firestore 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

Cloud Firestore 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 |
| `$second` | Yes |
| `$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 |
| `$lookup` | Yes Doesn't support the `let` and `pipeline` fields. |
| `$match` | Yes |
| `$out` | No |
| `$project` | Yes |
| `$redact` | No |
| `$replaceRoot` | Yes |
| `$sample` | No |
| `$set` | Yes |
| `$skip` | Yes |
| `$sort` | Yes |
| `$sortByCount` | Yes |
| `$unset` | Yes |
| `$unwind` | Yes |

### String operators

| **Operator** | **Supported** |
|---|---|
| `$concat` | Yes |
| `$dateFromString` | Yes |
| `$dateToString` | Yes |
| `$indexOfBytes` | Yes |
| `$indexOfCP` | Yes |
| `$split` | Yes |
| `$strcasecmp` | Yes |
| `$strLenBytes` | Yes |
| `$strLenCP` | Yes |
| `$substr` | Yes |
| `$substrBytes` | Yes |
| `$substrCP` | Yes |
| `$toLower` | Yes |
| `$toString` | Yes |
| `$toUpper` | Yes |

### System variables

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

### Text operators

| **Operator** | **Supported** |
|---|---|
| `$meta` | No |

### Type operators

| **Operator** | **Supported** |
|---|---|
| `$type` | Yes |

### Variable operators

| **Operator** | **Supported** |
|---|---|
| `$let` | Yes |

## Geospatial

Cloud Firestore 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 |
| `$near` | No |
| `$nearSphere` | No |
| `$nearSphere` | No |
| `$uniqueDocs` | No |

## Indexes and index properties

Cloud Firestore supports the following indexes and index operators.

### Indexes

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

### Index properties

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

## Database commands

Cloud Firestore 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** |
|---|---|
| `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** |
|---|---|
| `endSessions` | Yes |
| `killAllSessions` | No |
| `killAllSessionsByPattern` | No |
| `killSessions` | No |
| `refreshSessions` | No |
| `startSession` | Sessions can be started using the `startSession` driver method. |

## Administrative commands

Cloud Firestore supports the following administrative commands.

| **Command** | **Supported** |
|---|---|
| `cloneCollectionAsCapped` | No |
| `collMod` | No |
| `collMod: expireAfterSeconds` | No |
| `convertToCapped` | No |
| `copydb` | No |
| `create` | Yes |
| `createIndex` | Yes To create indexes, see [Manage indexes](https://firebase.google.com/docs/firestore/enterprise/indexing). |
| `createIndexes` | Yes To create indexes, see [Manage indexes](https://firebase.google.com/docs/firestore/enterprise/indexing). |
| `createView` | No |
| `currentOp` | No |
| `drop` | No |
| `dropDatabase` | No To delete a database, see [Delete a database](https://firebase.google.com/docs/firestore/enterprise/create-databases#delete-database). |
| `dropIndex` | Yes To delete indexes, see [Manage indexes](https://firebase.google.com/docs/firestore/enterprise/indexing). |
| `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](https://firebase.google.com/docs/firestore/enterprise/query-explain#explain-command) |
| `features` | No |
| `hostInfo` | Yes |
| `listCommands` | No |
| `profiler` | No |
| `serverStatus` | No |
| `top` | No |
| `whatsmyuri` | No |

### Role management commands

To manage database access, Cloud Firestore supports
[Identity and Access Management roles and permissions](https://firebase.google.com/docs/firestore/enterprise/security/iam).

| **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](https://firebase.google.com/docs/firestore/enterprise/create-and-query-database).
- Learn about [Behavior differences](https://firebase.google.com/docs/firestore/enterprise/behavior-differences).