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

The `$rename` operator in Amazon DocumentDB is used to rename a field in a document. This operator can be particularly useful when you need to update the structure of your documents or align them with new data models.

**Parameters**
+ `field`: The field to be renamed.
+ `newName`: The new name for the field.

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

The following example demonstrates how to use the `$rename` operator to rename the `&quot;Date.DoW&quot;` field to `&quot;Date.DayOfWeek&quot;` in a document with the `&quot;DocName&quot;` field set to `&quot;Document 1&quot;`.

**Create sample documents**

```
db.example.insertOne({
    "DocName": "Document 1",
    "Date": {
        "Month": 4,
        "Day": 18,
        "Year": 1987,
        "DoW": "Saturday"
    },
    "Words": 2482
})
```

**Query example**

```
db.example.update(
    { "DocName": "Document 1" },
    { $rename: { "Date.DoW": "Date.DayOfWeek" } }
)
```

**Output**

```
{
    "DocName": "Document 1",
    "Date": {
        "Month": 4,
        "Day": 18,
        "Year": 1987,
        "DayOfWeek": "Saturday"
    },
    "Words": 2482
}
```

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

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

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

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

async function example() {
    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('example');

    await collection.updateOne(
        { "DocName": "Document 1" },
        { $rename: { "Date.DoW": "Date.DayOfWeek" } }
    );

    const updatedDoc = await collection.findOne({ "DocName": "Document 1" });
    console.log(updatedDoc);

    await client.close();
}

example();
```

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

```
from pymongo import MongoClient

def example():
    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['example']

    collection.update_one(
        {"DocName": "Document 1"},
        {"$rename": {"Date.DoW": "Date.DayOfWeek"}}
    )

    updated_doc = collection.find_one({"DocName": "Document 1"})
    print(updated_doc)

    client.close()

example()
```

------