# The attributes block

The attributes block contains information on how attributes will be shown both on the popup and the table. Each attribute definition can contain the following properties:

<table><thead><tr><th width="191">Field name</th><th>Description</th></tr></thead><tbody><tr><td><code>displayName</code></td><td>Optional. How this attribute will be shown in different parts of the Felt UI.</td></tr><tr><td><code>format</code></td><td>Optional. A <a href="https://numbrojs.com/">numbro</a> object that encodes how numeric fields should be shown.</td></tr></tbody></table>

{% code title="Example of an attribute blocks block" %}

```jsx
"attributes": {
  "faa": {
    "displayName": "FAA Code",
    "format": {
      "mantissa": 0,
      "thousandSeparated": true
    }
  },
  "wikipedia": {"displayName": "Wikipedia"},
}
```

{% endcode %}