> ## Documentation Index
> Fetch the complete documentation index at: https://docs.runconverge.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Custom Event Properties

> Add custom properties to the auto-tracked events

### Tracking custom event properties for auto-tracked events

If you're using one of our prebuilt source integrations, and you want to include custom properties (or modify existing properties) on these events, then you can do so using the `set` method.

Imagine, for example, that I want to send a custom property with my `Added To Cart` event.
I would then call the following function *before* the `Added To Cart` event is fired.

```js theme={null}
cvg({method: "set", eventProperties: {hello:"world"}})
```

When my `Added To Cart` event fires, it will now include the custom `hello -> world` property mapping.

You can modify profile properties in the same way, a full example of the function would be:

```js theme={null}
cvg({method: "set", properties: {...profileProperties}, eventProperties: {...eventProperties}})
```