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

New from version 8.0

The `$rand` operator in Amazon DocumentDB is used to generate a random number between 0 and 1.

**Parameters**

None

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

The following example demonstrates how to use the `$rand` operator to randomly select two documents from the `temp` collection.

**Create sample documents**

```
db.items.insertMany([
  { "name": "pencil", "quantity": 110 },
  { "name": "pen", "quantity": 159 }
])
```

**Query example**

```
db.items.aggregate([
  {
    $project: {
      randomValue: { $rand: {} }
    }
  }
])
```

**Output**

```
[
  {
    _id: ObjectId('6924a5edd66dcae121d29517'),
    randomValue: 0.8615243955294392
  },
  {
    _id: ObjectId('6924a5edd66dcae121d29518'),
    randomValue: 0.22815483022099903
  }
]
```

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

To view a code example for using the `$rand` 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('items');

  const result = await collection.aggregate([
    {
      $project: {
        randomValue: { $rand: {} }
      }
    }
  ]).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['items']

  result = list(collection.aggregate([
      {
        "$project": {
          "randomValue": { "$rand": {} }
        }
      }
  ]))

  print(result)

  client.close()

example()
```

------