# Logging

The Didomi SDK on iOS will log various informational and error messages.

As recommended by Apple, we use two mechanisms for logging:

* [NSLog](https://developer.apple.com/documentation/foundation/1395275-nslog) for iOS 9
* [os\_log](https://developer.apple.com/documentation/os/logging) for iOS 10+

## Formats

### iOS 9 - NSLog

Messages logged with `NSLog` use the format: `Didomi - {LEVEL} - {Message}`

Example: `Didomi - ERROR - Didomi SDK is not ready`

### iOS 10+ - os\_log

Messages logged with `os_log` use the type type to indicate the level and the following information:

* Subsystem: `Bundle.main.bundleIdentifier` or `io.didomi.sdk` if the bundler identifier is not available
* Category: `Didomi`

Example:

![](/files/-M9VFn0OOrecoG-yvCwI)

## Levels

We use the [standard log levels supported by os\_log](https://developer.apple.com/documentation/os/oslogtype): `debug`, `error`, `info`, and `fault`.

You can decide what level of logs should be displayed by the SDK by calling the setLogLevel function:

```swift
import os

...

Didomi.shared.setLogLevel(minLevel: OSLogType.debug.rawValue)
Didomi.shared.setLogLevel(minLevel: 2)
Didomi.shared.initialize(...)
```

{% hint style="danger" %}
Make sure that the call to `setLogLevel` is done before the call to `initialize` or some messages will be logged at the wrong level.
{% endhint %}

If your app supports iOS 9, use the actual value of the error level instead of `OSLogType`:

| Level   | Value |
| ------- | ----- |
| `info`  | 1     |
| `debug` | 2     |
| `error` | 16    |
| `fault` | 17    |


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