> ## Documentation Index
> Fetch the complete documentation index at: https://mintlify.com/upstash/redis-js/llms.txt
> Use this file to discover all available pages before exploring further.

# exists

> Check if one or more keys exist

## Description

Returns the number of keys that exist from those specified as arguments.

## Method Signature

```typescript theme={null}
exists(...keys: string[]): Promise<number>
```

## Parameters

<ParamField path="keys" type="string[]" required>
  One or more keys to check for existence
</ParamField>

## Return Value

<ResponseField name="result" type="number">
  The number of keys that exist. If the same existing key is mentioned in the arguments multiple times, it will be counted multiple times.
</ResponseField>

## Examples

### Check single key existence

```typescript theme={null}
await redis.set("mykey", "value");
const exists = await redis.exists("mykey");
console.log(exists); // 1

const notExists = await redis.exists("nonexistent");
console.log(notExists); // 0
```

### Check multiple keys

```typescript theme={null}
await redis.set("key1", "value1");
await redis.set("key2", "value2");

const exists = await redis.exists("key1", "key2", "key3");
console.log(exists); // 2 (key1 and key2 exist, key3 does not)
```

### Duplicate keys are counted multiple times

```typescript theme={null}
await redis.set("mykey", "value");
const exists = await redis.exists("mykey", "mykey", "mykey");
console.log(exists); // 3
```

## See Also

* [del](/api/commands/del) - Delete keys
* [keys](/api/commands/keys) - Find keys matching a pattern