# feature

[[Source]](https://github.com/XRPLF/rippled/blob/master/src/ripple/rpc/handlers/Feature1.cpp)

The `feature` command returns information about [amendments](/docs/concepts/networks-and-servers/amendments) this server knows about, including whether they are enabled and whether the server is voting in favor of those amendments in the [amendment process](/docs/concepts/networks-and-servers/amendments#amendment-process).

You can use the `feature` command to configure the server to vote against or in favor of an amendment. This change persists even if you restart the server. Updated in: rippled 1.7.0

*The `feature` method documented on this page is an [admin method](/docs/references/http-websocket-apis/admin-api-methods). For the non-admin version, see the [`feature` public API method](/docs/references/http-websocket-apis/public-api-methods/server-info-methods/feature).*

### Request Format

An example of the request format:

WebSocket - list all

```json
{
  "id": "list_all_features",
  "command": "feature"
}
```

WebSocket - reject

```json
{
  "id": "reject_multi_sign",
  "command": "feature",
  "feature": "4C97EBA926031A7CF7D7B36FDE3ED66DDA5421192D63DE53FFB46E43B9DC8373",
  "vetoed": true
}
```

JSON-RPC

```json
{
    "method": "feature",
    "params": [
        {
            "feature": "4C97EBA926031A7CF7D7B36FDE3ED66DDA5421192D63DE53FFB46E43B9DC8373",
            "vetoed": false
        }
    ]
}
```

Commandline

```sh
#Syntax: feature [<feature_id> [accept|reject]]
rippled feature 4C97EBA926031A7CF7D7B36FDE3ED66DDA5421192D63DE53FFB46E43B9DC8373 accept
```

The request includes the following parameters:

| `Field` | Type | Description |
|  --- | --- | --- |
| `feature` | String | *(Optional)* The unique ID of an amendment, as hexadecimal; or the short name of the amendment. If provided, limits the response to one amendment. Otherwise, the response lists all amendments. |
| `vetoed` | Boolean | *(Optional; ignored unless `feature` also specified)* If `true`, instructs the server to vote against the amendment specified by `feature`. If false, instructs the server to vote in favor of the amendment. On the commandline, use 'accept' or 'reject rather than 'true' or 'false'. You cannot vote in favor of an amendment that is marked as *obsolete* in the server's source code. Updated in: rippled 1.11.0 |


You can configure your server to vote in favor of a new amendment, even if the server does not currently know how to apply that amendment, by specifying the amendment ID in the `feature` field. For example, you might want to do this if you plan to upgrade soon to a new `rippled` version that *does* support the amendment.

### Response Format

An example of a successful response:

WebSocket - list all

```json
{
  "id": "list_all_features",
  "status": "success",
  "type": "response",
  "result": {
    "features": {
      "42426C4D4F1009EE67080A9B7965B44656D7714D104A72F9B4369F97ABF044EE": {
        "enabled": false,
        "name": "FeeEscalation",
        "supported": true,
        "vetoed": false
      },
      "4C97EBA926031A7CF7D7B36FDE3ED66DDA5421192D63DE53FFB46E43B9DC8373": {
        "enabled": false,
        "name": "MultiSign",
        "supported": true,
        "vetoed": false
      },
      "6781F8368C4771B83E8B821D88F580202BCB4228075297B19E4FDC5233F1EFDC": {
        "enabled": false,
        "name": "TrustSetAuth",
        "supported": true,
        "vetoed": false
      },
      "C1B8D934087225F509BEB5A8EC24447854713EE447D277F69545ABFA0E0FD490": {
        "enabled": false,
        "name": "Tickets",
        "supported": true,
        "vetoed": false
      },
      "DA1BD556B42D85EA9C84066D028D355B52416734D3283F85E216EA5DA6DB7E13": {
        "enabled": false,
        "name": "SusPay",
        "supported": true,
        "vetoed": false
      }
    }
  }
}
```

WebSocket - reject

```json
{
    "id": "reject_multi_sign",
    "status": "success",
    "type": "response",
    "result": {
        "features": {
            "4C97EBA926031A7CF7D7B36FDE3ED66DDA5421192D63DE53FFB46E43B9DC8373": {
                "enabled": false,
                "name": "MultiSign",
                "supported": true,
                "vetoed": true
            }
        }
    }
}
```

JSON-RPC

```json
200 OK

{
    "result": {
        "4C97EBA926031A7CF7D7B36FDE3ED66DDA5421192D63DE53FFB46E43B9DC8373": {
            "enabled": false,
            "name": "MultiSign",
            "supported": true,
            "vetoed": false
        },
        "status": "success"
    }
}
```

Commandline

```json
Loading: "/etc/rippled.cfg"
Connecting to 127.0.0.1:5005

{
    "result": {
        "4C97EBA926031A7CF7D7B36FDE3ED66DDA5421192D63DE53FFB46E43B9DC8373": {
            "enabled": false,
            "name": "MultiSign",
            "supported": true,
            "vetoed": false
        },
        "status": "success"
    }
}
```

The response follows the [standard format](/docs/references/http-websocket-apis/api-conventions/response-formatting), with a successful result containing **a map of amendments** as a JSON object. The keys of the object are amendment IDs. The values for each key are *amendment objects* that describe the status of the amendment with that ID. If the request specified a `feature`, the map contains only the requested amendment object, after applying any changes from the request. Each amendment object has the following fields:

| `Field` | Type | Description |
|  --- | --- | --- |
| `enabled` | Boolean | Whether this amendment is currently enabled in the latest ledger. |
| `name` | String | (May be omitted) The human-readable name for this amendment, if known. |
| `supported` | Boolean | Whether the server knows how to apply this amendment. If this field is set to `false` (the server does not know how to apply this amendment) and `enabled` is set to `true` (this amendment is enabled in the latest ledger), this amendment may cause your server to be [amendment blocked](/docs/concepts/networks-and-servers/amendments#amendment-blocked-servers). |
| `vetoed` | Boolean or String | For most amendments, this is a boolean value indicating whether the server has been instructed to vote against this amendment. For amendments that are marked as obsolete in the code, this is the string `Obsolete` instead. Updated in: rippled 1.11.0 |


The `name` for an amendment does not strictly indicate what that amendment does. The name is not guaranteed to be unique or consistent across servers.

### Possible Errors

- Any of the [universal error types](/docs/references/http-websocket-apis/api-conventions/error-formatting#universal-errors).
- `badFeature` - The `feature` specified was invalidly formatted, or the server does not know an amendment with that name.