---
title: sign-a-token
product: vercel
url: /docs/rest-api/kms/sign-a-token
canonical_url: "https://vercel.com/docs/rest-api/kms/sign-a-token"
last_updated: 2026-09-08
type: reference
prerequisites:
  []
related:
  - /docs/rest-api
summary: Learn about sign-a-token on Vercel.
install_vercel_plugin: npx plugins add vercel/vercel-plugin
---

# Sign a token

```http
POST /v1/kms/issuers/{issuerId}/sign/token
```

Sign a JWT with a KMS issuer's active signing key. Authenticate the request with a Vercel OIDC token in the `Authorization: Bearer` header; the issuer's policies decide which workloads are allowed to sign.

## Authentication

**bearerToken**: HTTP bearer

## Path parameters

| Name | Type | Required | Description |
|---|---|---|---|
| `issuerId` | string | Yes | The ID of the issuer. |


## Request body

Required: No

Content-Type: `application/json`

```json
{
  "type": "object",
  "properties": {
    "claims": {
      "type": "object",
      "description": "The claims to include in the token."
    },
    "headers": {
      "type": "object",
      "description": "Additional headers to include in the token."
    },
    "ttl": {
      "type": "number",
      "description": "The time-to-live for the token, in seconds.",
      "default": 300,
      "nullable": true
    }
  }
}
```

## Example request

### TypeScript

```typescript
const response = await fetch('https://api.vercel.com/v1/kms/issuers/issuerId/sign/token', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_ACCESS_TOKEN',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    "claims": "value",
    "headers": "value",
    "ttl": "123"
  }),
});

const data = await response.json();
console.log(data);
```

### Next.js

```typescript
'use server';

export async function callEndpoint() {
  const response = await fetch('https://api.vercel.com/v1/kms/issuers/issuerId/sign/token', {
    method: 'POST',
    headers: {
      'Authorization': `Bearer ${process.env.VERCEL_ACCESS_TOKEN}`,
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({
      "claims": "value",
      "headers": "value",
      "ttl": "123"
    }),
    next: { revalidate: 3600 }
  });

  if (!response.ok) {
    throw new Error('Request failed');
  }

  return response.json();
}
```

### cURL

```bash
curl -X POST 'https://api.vercel.com/v1/kms/issuers/issuerId/sign/token' \
  -H 'Authorization: Bearer YOUR_ACCESS_TOKEN' \
  -H 'Content-Type: application/json' \
  -d "{
    \"claims\": \"value\",
    \"headers\": \"value\",
    \"ttl\": \"123\"
  }"
```

## Example response

```json
{
  "token": "string"
}
```

## Responses

### 200: No description

Content-Type: `application/json`

```json
{
  "type": "object",
  "required": [
    "token"
  ],
  "properties": {
    "token": {
      "type": "string"
    }
  }
}
```

### 400: One of the provided values in the request body is invalid.
One of the provided values in the request query is invalid.

### 401: No description

### 403: No description

### 404: No description

### 429: No description

---

## Related

- [kms endpoints](/docs/rest-api#kms)

- [REST API overview](/docs/rest-api)

- [OpenAPI spec](https://openapi.vercel.sh/) (machine-readable, all endpoints)

---

[View full sitemap](/docs/sitemap)