> For the complete documentation index, see [llms.txt](https://docs.drivequant.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.drivequant.com/trip-analysis/ios/custom-metadata.md).

# Custom metadata

If your use case requires it, it is possible to add your own data in the trip analysis request. For example, it can be data that is specific to your trip, application or user identification system.

{% hint style="warning" %}
Metadata is persisted, so if you want to send it only for one trip, you need to remove it at the end of the trip, on the [`sdkStateChanged(state: State)`](/trip-analysis/ios/triplistener.md)callback, by checking if `state` is `inactive`.
{% endhint %}

## Set metadata

You can add additional metadata to your trip by calling the following method:

```swift
let metadata: [String: String] = [
    "key": "value"
]
DriveKitTripAnalysis.shared.setTripMetadata(metadata)
```

The metadata must be represented as a key/value object where the key and value have a String type.

The metadata can be set any time before the end of a trip.

If metadata is sent, it will also be added to the push data request in the metaData field.

## Get metadata

It is possible to get a copy of configured metadata thanks to the following method on DriveKitTripAnalysis:

```swift
DriveKitTripAnalysis.shared.getTripMetadata()
```

{% hint style="info" %}
Note: Any modification on the returned object has no effect on the metadata sent with a trip.
{% endhint %}

## Update metadata

To update a value in metadata, call the following method:

```swift
DriveKitTripAnalysis.shared.updateTripMetadata(key: String, value: String?)
```

## Delete a specific metadata

To delete a specific value in metadata, call the following method:

```swift
DriveKitTripAnalysis.shared.deleteTripMetadata(key: String)
```

## Delete all metadata

To delete all values in metadata, call this method:

```swift
DriveKitTripAnalysis.shared.deleteTripMetadata()
```