# FUNCTION RESTORE

```json metadata
{
  "title": "FUNCTION RESTORE",
  "description": "Restores all libraries from a payload.",
  "categories": ["docs","develop","stack","oss","rs","rc","oss","kubernetes","clients"],
  "arguments": [{"display_text":"serialized-value","name":"serialized-value","type":"string"},{"arguments":[{"display_text":"flush","name":"flush","token":"FLUSH","type":"pure-token"},{"display_text":"append","name":"append","token":"APPEND","type":"pure-token"},{"display_text":"replace","name":"replace","token":"REPLACE","type":"pure-token"}],"name":"policy","optional":true,"type":"oneof"}],
  "syntax_fmt": "FUNCTION RESTORE serialized-value [FLUSH | APPEND | REPLACE]",
  "complexity": "O(N) where N is the number of functions on the payload",
  "group": "scripting",
  "command_flags": ["write","denyoom","noscript"],
  "acl_categories": ["@write","@slow","@scripting"],
  "since": "7.0.0",
  "arity": -3,
  "tableOfContents": {"sections":[{"id":"required-arguments","title":"Required arguments"},{"id":"optional-arguments","title":"Optional arguments"},{"id":"redis-software-and-redis-cloud-compatibility","title":"Redis Software and Redis Cloud compatibility"},{"id":"return-information","title":"Return information"}]}

,
  "codeExamples": []
}
```Restore libraries from serialized payload.

You can use the optional [policy argument](#optional-arguments) to provide a policy for handling existing libraries.


For more information see [Introduction to Redis Functions](https://redis.io/docs/latest/develop/programmability/functions-intro).

## Required arguments

<details open><summary><code>serialized-value</code></summary>

The payload produced by [`FUNCTION DUMP`](https://redis.io/docs/latest/commands/function-dump).

</details>

## Optional arguments

<details open><summary><code>FLUSH | APPEND | REPLACE</code></summary>

Policies for handling existing libraries:

* `APPEND:` appends the restored libraries to the existing libraries and aborts on collision. 
  This is the default policy.
* `FLUSH:` deletes all existing libraries before restoring the payload.
* `REPLACE:` appends the restored libraries to the existing libraries, replacing any existing ones in case of name collisions. Note that this policy doesn't prevent function name collisions, only libraries.

</details>

## Redis Software and Redis Cloud compatibility

| Redis<br />Software | Redis<br />Cloud | <span style="min-width: 9em; display: table-cell">Notes</span> |
|:----------------------|:-----------------|:------|
| <span title="Supported">&#x2705; Standard</span><br /><span title="Supported"><nobr>&#x2705; Active-Active</nobr></span> | <span title="Supported">&#x2705; Standard</span><br /><span title="Supported"><nobr>&#x2705; Active-Active</nobr></span> |  |

## Return information

**RESP2:**

[Simple string reply](../../develop/reference/protocol-spec#simple-strings): `OK`.

**RESP3:**

[Simple string reply](../../develop/reference/protocol-spec#simple-strings): `OK`.