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

The `$toUpper` operator in Amazon DocumentDB is used to convert a string to uppercase.

**Parameters**
+ `expression`: The string expression to convert to uppercase.

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

The following example demonstrates the usage of the `$toUpper` operator to convert the `Desk` field to uppercase.

**Create sample documents**

```
db.locations.insertMany([
  { "_id": 1, "Desk": "düsseldorf-bvv-021" },
  { "_id": 2, "Desk": "munich-hgg-32a" }
]);
```

**Query example**

```
db.locations.aggregate([
  { $project: { item: { $toUpper: "$Desk" } } }
]);
```

**Output**

```
{ "_id" : 1, "item" : "DüSSELDORF-BVV-021" }
{ "_id" : 2, "item" : "MUNICH-HGG-32A" }
```

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

To view a code example for using the `$toUpper` 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('locations');

  const result = await collection.aggregate([
    { $project: { item: { $toUpper: '$Desk' } } }
  ]).toArray();

  console.log(result);

  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['locations']

    result = list(collection.aggregate([
        { '$project': { 'item': { '$toUpper': '$Desk' } } }
    ]))

    print(result)

    client.close()

example()
```

------