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

# EVALSHA_RO

> Evaluate a cached read-only Lua script server side.

`EVALSHA_RO` is like `EVAL_RO` but instead of sending the script over the wire every time, you reference the script by its SHA1 hash. This is useful for caching scripts on the server side.

## Arguments

<ParamField body="sha" type="string" required>
  The sha1 hash of the read-only script.
</ParamField>

<ParamField body="keys" type="string[]" required>
  All of the keys accessed in the script
</ParamField>

<ParamField body="args" type="unknown[]" required>
  All of the arguments you passed to the script
</ParamField>

## Response

<ResponseField type="?" required>
  The result of the script.
</ResponseField>

<RequestExample>
  ```ts Example theme={"system"}

  const result = await redis.evalshaRo("fb67a0c03b48ddbf8b4c9b011e779563bdbc28cb", [], ["hello"]);
  console.log(result) // "hello"

  ```
</RequestExample>