> ## 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.

# SINTER

> Get the intersection of multiple sets

Returns the members of the set resulting from the intersection of all the given sets. Keys that do not exist are considered to be empty sets.

## Usage

```typescript theme={null}
await redis.sinter(key, ...keys);
```

## Parameters

<ParamField body="key" type="string" required>
  The first set key
</ParamField>

<ParamField body="keys" type="string[]">
  Additional set keys to intersect with
</ParamField>

## Response

<ResponseField name="result" type="TData[]">
  An array containing the members of the resulting set (intersection of all sets)
</ResponseField>

## Examples

### Intersect two sets

```typescript theme={null}
await redis.sadd("set1", "a", "b", "c", "d");
await redis.sadd("set2", "c", "d", "e", "f");

const result = await redis.sinter("set1", "set2");
console.log(result); // ["c", "d"]
```

### Intersect multiple sets

```typescript theme={null}
await redis.sadd("tags:post1", "javascript", "typescript", "react");
await redis.sadd("tags:post2", "typescript", "react", "node");
await redis.sadd("tags:post3", "react", "vue", "typescript");

const commonTags = await redis.sinter("tags:post1", "tags:post2", "tags:post3");
console.log(commonTags); // ["typescript", "react"]
```

### Find common friends

```typescript theme={null}
await redis.sadd("friends:alice", "bob", "charlie", "david");
await redis.sadd("friends:bob", "alice", "charlie", "eve");

const mutualFriends = await redis.sinter("friends:alice", "friends:bob");
console.log(mutualFriends); // ["charlie"]
```

### Empty intersection

```typescript theme={null}
await redis.sadd("set1", "a", "b", "c");
await redis.sadd("set2", "d", "e", "f");

const result = await redis.sinter("set1", "set2");
console.log(result); // []
```