# \$1type
<a name="type"></a>

The `$type` operator is used to check the data type of a field in a document. It can used when type-specific operations or validations are needed. The `$type` operator returns the BSON type of the evaluated expression. The returned type is a string, which corresponds to the type of the field or expression.

Planner version 2.0 added index support for `$type`.

**Parameters**
+ `expression` : The expression to evaluate.

## Example (MongoDB Shell)
<a name="type-examples"></a>

**Create sample documents**

```
db.documents.insertMany([
  { _id: 1, name: "John", age: 30, email: "john@example.com" },
  { _id: 2, name: "Jane", age: "25", email: 123456 },
  { _id: 3, name: 123, age: true, email: null }
]);
```

**Query example**

```
db.documents.find({
  $or: [
    { age: { $type: "number" } },
    { email: { $type: "string" } },
    { name: { $type: "string" } }
  ]
})
```

**Output**

```
[
  { "_id": 1, "name": "John", "age": 30, "email": "john@example.com" },
  { "_id": 2, "name": "Jane", "age": "25", "email": 123456 }
]
```

This query will return the documents where the `age` field is of type "number", the `email` field is of type "string", and the `name` field is of type "string".

## Code examples
<a name="type-code"></a>

To view a code example for using the `$type` command, choose the tab for the language that you want to use:

------
#### [ Node.js ]

```
const { MongoClient } = require('mongodb');

async function findByType() {
  const client = await MongoClient.connect('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false');
  const db = client.db('test');
  const collection = db.collection('documents');

  const results = await collection.find({
    $or: [
      { age: { $type: 'number' } },
      { email: { $type: 'string' } },
      { name: { $type: 'string' } }
    ]
  }).toArray();

  console.log(results);
  client.close();
}

findByType();
```

------
#### [ Python ]

```
from pymongo import MongoClient

def find_by_type():
    client = MongoClient('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false')
    db = client['test']
    collection = db['documents']

    results = list(collection.find({
        '$or': [
            {'age': {'$type': 'number'}},
            {'email': {'$type': 'string'}},
            {'name': {'$type': 'string'}}
        ]
    }))

    print(results)
    client.close()

find_by_type()
```

------