## Create a token validation rule

`client.tokenValidation.rules.create(RuleCreateParamsparams, RequestOptionsoptions?): TokenValidationRule`

**post** `/zones/{zone_id}/token_validation/rules`

Create a token validation rule.

### Parameters

- `params: RuleCreateParams`

  - `zone_id: string`

    Path param: Identifier.

  - `action: "log" | "block"`

    Body param: Action to take on requests that match operations included in `selector` and fail `expression`.

    - `"log"`

    - `"block"`

  - `description: string`

    Body param: A human-readable description that gives more details than `title`.

  - `enabled: boolean`

    Body param: Toggle rule on or off.

  - `expression: string`

    Body param: Rule expression. Requests that fail to match this expression will be subject to `action`.

    For details on expressions, see the [Cloudflare Docs](https://developers.cloudflare.com/api-shield/security/jwt-validation/).

  - `selector: Selector`

    Body param: Select operations covered by this rule.

    For details on selectors, see the [Cloudflare Docs](https://developers.cloudflare.com/api-shield/security/jwt-validation/).

    - `exclude?: Array<Exclude> | null`

      Ignore operations that were otherwise included by `include`.

      - `operation_ids?: Array<string>`

        Excluded operation IDs.

    - `include?: Array<Include> | null`

      Select all matching operations.

      - `host?: Array<string>`

        Included hostnames.

  - `title: string`

    Body param: A human-readable name for the rule.

### Returns

- `TokenValidationRule`

  A Token Validation rule that can enforce security policies using JWT Tokens.

  - `action: "log" | "block"`

    Action to take on requests that match operations included in `selector` and fail `expression`.

    - `"log"`

    - `"block"`

  - `description: string`

    A human-readable description that gives more details than `title`.

  - `enabled: boolean`

    Toggle rule on or off.

  - `expression: string`

    Rule expression. Requests that fail to match this expression will be subject to `action`.

    For details on expressions, see the [Cloudflare Docs](https://developers.cloudflare.com/api-shield/security/jwt-validation/).

  - `selector: Selector`

    Select operations covered by this rule.

    For details on selectors, see the [Cloudflare Docs](https://developers.cloudflare.com/api-shield/security/jwt-validation/).

    - `exclude?: Array<Exclude> | null`

      Ignore operations that were otherwise included by `include`.

      - `operation_ids?: Array<string>`

        Excluded operation IDs.

    - `include?: Array<Include> | null`

      Select all matching operations.

      - `host?: Array<string>`

        Included hostnames.

  - `title: string`

    A human-readable name for the rule.

  - `id?: string`

    UUID.

  - `created_at?: string`

  - `last_updated?: string`

### Example

```node
import Cloudflare from 'cloudflare';

const client = new Cloudflare({
  apiToken: process.env['CLOUDFLARE_API_TOKEN'], // This is the default and can be omitted
});

const tokenValidationRule = await client.tokenValidation.rules.create({
  zone_id: '023e105f4ecef8ad9ca31a8372d0c353',
  action: 'log',
  description: 'Long description for Token Validation Rule',
  enabled: true,
  expression:
    'is_jwt_valid("52973293-cb04-4a97-8f55-e7d2ad1107dd") or is_jwt_valid("46eab8d1-6376-45e3-968f-2c649d77d423")',
  selector: {},
  title: 'Example Token Validation Rule',
});

console.log(tokenValidationRule.id);
```

#### Response

```json
{
  "errors": [
    {
      "code": 1000,
      "message": "message",
      "documentation_url": "documentation_url",
      "source": {
        "pointer": "pointer"
      }
    }
  ],
  "messages": [
    {
      "code": 1000,
      "message": "message",
      "documentation_url": "documentation_url",
      "source": {
        "pointer": "pointer"
      }
    }
  ],
  "result": {
    "action": "log",
    "description": "Long description for Token Validation Rule",
    "enabled": true,
    "expression": "is_jwt_valid(\"52973293-cb04-4a97-8f55-e7d2ad1107dd\") or is_jwt_valid(\"46eab8d1-6376-45e3-968f-2c649d77d423\")",
    "selector": {
      "exclude": [
        {
          "operation_ids": [
            "f9c5615e-fe15-48ce-bec6-cfc1946f1bec",
            "56828eae-035a-4396-ba07-51c66d680a04"
          ]
        }
      ],
      "include": [
        {
          "host": [
            "v1.example.com",
            "v2.example.com"
          ]
        }
      ]
    },
    "title": "Example Token Validation Rule",
    "id": "f174e90a-fafe-4643-bbbc-4a0ed4fc8415",
    "created_at": "2014-01-01T05:20:00.12345Z",
    "last_updated": "2014-01-01T05:20:00.12345Z"
  },
  "success": true
}
```