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---
# JsonModel
A base model class that can be serialized to JSON with extra
properties support.
- Full name: `\Logto\Sdk\Models\JsonModel`
- This class implements:
[`\JsonSerializable`](../../../JsonSerializable.md)
## Properties
### extra
The extra fields of the model.
```php
public ?array $extra
```
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public jsonSerialize(): arrayAutomatically generated from source code comments using phpDocumentor and saggre/phpdocumentor-markdown