| Type | Number |
| Double | 1 |
| String | 2 |
| Object | 3 |
| Array | 4 |
| Binary data | 5 |
| Object id | 7 |
| Boolean | 8 |
| Date | 9 |
| Null | 10 |
| Regular Expression | 11 |
| JavaScript | 13 |
| Symbol | 14 |
| JavaScript (with scope) | 15 |
| 32-bit integer | 16 |
| Timestamp | 17 |
| 64-bit integer | 18 |
| Min key | 255 |
| Max key | 127 |
两个不同类型的值相比较时，按照如下顺序决定大小
- MinKey (internal type)
- Null
- Numbers (ints, longs, doubles)
- Symbol, String
- Object
- Array
- BinData
- ObjectID
- Boolean
- Date, Timestamp
- Regular Expression
- MaxKey (internal type)
当使用$type判断某个文档属性是否是MinKey时，不应使用255，应使用-1