# setNAGKey()

**Method signature**

```javascript
function setNAGKey(nagKey)
```

**Parameters**

| Name     | Type   | Description |
| -------- | ------ | ----------- |
| `nagKey` | string | nagKey      |

**Example**

```javascript
var nagKey = "48656c6c6f2c20576f726c6421";

CircularProtocolAPI.setNAGKey(NAGKey);
```