> ## Documentation index
> Fetch the complete documentation index at: https://upstash.com/docs/llms.txt
> Ask it with GET https://upstash.com/docs/ask?q=<keywords or question>. Short keywords rank best.
> Use these to discover all available pages before exploring further.
> Feature requests: https://upstash.com/docs/common/help/feature-requests.md lists what users asked for and how to vote for a request or add one.
> Page rating: `GET https://upstash.com/docs/feedback?path=/docs/redis/sdks/ts/commands/list/lset&helpful=true` (or `false`) records whether this page helped. An optional `comment` (URL-encoded, at most 500 characters) says what was missing or wrong. It is anonymous and needs no key. Comments hold no code, secrets or personal data.

# LSET

> Set a value at a specific index.

## Arguments

<ParamField body="key" type="string" required>
  The key of the list.
</ParamField>

<ParamField body="index" type="number" required>
 At which index to set the value.
</ParamField>

<ParamField body="data" type="TValue" required>
  The value to set.
</ParamField>

## Response

<ResponseField type="OK" required>
  `OK`
</ResponseField>

<RequestExample>
```ts Example 
await redis.lpush("key", "a", "b", "c"); 
await redis.lset("key", 1, "d"); 

// list is now ["a", "d", "c"]
 ```
</RequestExample>