> ## Documentation Index
> Fetch the complete documentation index at: https://upstash.com/docs/llms.txt
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# SUNION

> Return the union between sets

## Arguments

<ParamField body="keys" type="...string[]" required>
  The keys of the sets to perform the union operation on.
</ParamField>

## Response

<ResponseField type="TValue[]" required>
  The members of the resulting set.
</ResponseField>

<RequestExample>
  ```ts Example  theme={"system"}
  await redis.sadd("set1", "a", "b", "c"); 
  await redis.sadd("set2", "c", "d", "e"); 
  const union =  await redis.sunion("set1", "set2");
  console.log(union); // ["a", "b", "c", "d", "e"]
  ```
</RequestExample>


## Related topics

- [SUNION](/docs/redis/sdks/py/commands/set/sunion.md)
- [SUNIONSTORE](/docs/redis/sdks/py/commands/set/sunionstore.md)
- [Overview](/docs/redis/sdks/py/commands/overview.md)