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

> ## Agent Instructions
> Unkey is two separate products. Compute builds, deploys, and runs apps behind a gateway. API Management issues API keys, enforces rate limits, manages identities and permissions, and reports usage. Say which product a page belongs to; a reader can use either without the other.
> Every Unkey API endpoint is an HTTP POST to https://api.unkey.com/v2/{service}.{procedure} with a root key in the Authorization: Bearer header. Root keys are workspace scoped.
> Error codes have the form err:{system}:{category}:{specific} and each has a page at /errors/{system}/{category}/{specific}.
> The word environment means production or preview in Compute. Rate limiting has four meanings on this site; the glossary lists them.

# unkey api keys reroll-key

> Issue a replacement key and let the old one expire after a grace period.

<Note>
  You need a root key with the permissions listed on this page. Create one in the dashboard under **Settings > Root Keys**. See [Permission reference](/docs/platform/root-keys/permissions-legacy) for every permission.
</Note>

Replace a key with a new one. The new key copies the old one's identity, permissions, roles, credits, rate limits, metadata, name, enabled state, and expiry. The expiry is the same date, so a key close to expiry gets a replacement close to expiry too. Use [`update-key`](/docs/api-management/cli/keys/update-key) to set a new one.

The response has the new key's plaintext, and you only see it once, so save it. The old key expires after `--expiration` milliseconds so callers have time to switch. It can keep verifying for about 10 seconds past that. Calls `POST /v2/keys.rerollKey`. See [Rerolling keys](/docs/api-management/keys/rerolling-keys).

## Usage

```bash theme={"system"}
unkey api keys reroll-key --expiration=<expiration> --key-id=<key id> [flags]
```

## Flags

<ParamField body="--expiration" type="integer" required>
  Milliseconds until the old key expires. The expiry is rounded up to the next whole minute, so the old key can work up to a minute longer than you asked. `0` expires it right away. The old key isn't deleted. After it expires, it verifies with `valid: false` and code `EXPIRED`.
</ParamField>

<ParamField body="--key-id" type="string" required>
  Id of the key to reroll.
</ParamField>

### Shared flags

Every `unkey api` command takes these. See [CLI output and shared flags](/docs/platform/cli/output-and-flags).

<ParamField body="--root-key" type="string">
  Root key used for the request. Falls back to `UNKEY_ROOT_KEY`, then to the key stored by `unkey auth login`.
</ParamField>

<ParamField body="--api-url" type="string" default="https://api.unkey.com">
  Base URL of the API. Falls back to `UNKEY_API_BASE_URL`. You don't normally need to set it.
</ParamField>

<ParamField body="--config" type="string" default="~/.unkey/config.toml">
  Path of the config file written by `unkey auth login`. Falls back to `UNKEY_CONFIG`.
</ParamField>

<ParamField body="--output" type="string">
  Output format. Falls back to `UNKEY_OUTPUT`. `json` prints the full response. Any other value prints the request ID and `data`.
</ParamField>

<ParamField body="--body" type="string">
  Send this JSON as the whole request body instead of using the command's flags. You can't combine it with them.
</ParamField>

## Required permissions

`api.*.create_key` or `api.<apiId>.create_key`, plus `api.*.encrypt_key` or `api.<apiId>.encrypt_key` when the original key is recoverable. See [Root key permissions](/docs/platform/root-keys/permissions).

## Examples

```bash Reroll with a one day overlap theme={"system"}
unkey api keys reroll-key --key-id=key_1234abcd --expiration=86400000
```

```bash Reroll and revoke immediately theme={"system"}
unkey api keys reroll-key --key-id=key_1234abcd --expiration=0
```

Or send the whole request as JSON:

```bash Raw body theme={"system"}
unkey api keys reroll-key --body='{"keyId":"key_1234abcd","expiration":86400000}'
```