> For the complete documentation index, see [llms.txt](https://hh-specs.handhistory.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hh-specs.handhistory.org/json-object/spec_version.md).

# spec\_version

#### spec\_version

A string with information describing the version of the specification.

**Type**: string

**Format:** [version\_string](/string-formats/less-than-version_obj-greater-than.md)

{% hint style="danger" %}
See the [Change Log](https://hh-specs.handhistory.org/change-log/change-log) for the current version number.
{% endhint %}

**Example:**

```javascript
"spec_version": "1.4.9"
```