json-api-server/docs/errors.md

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# Error Handling
The `JsonApi` class can produce [JSON:API error responses](https://jsonapi.org/format/#errors) from exceptions.
This is achieved by passing the caught exception into the `error` method.
```php
try {
$response = $api->handle($request);
} catch (Exception $e) {
$response = $api->error($e);
}
```
## Error Providers
Exceptions can implement the `ErrorProviderInterface` to determine what status code will be used in the response, and any JSON:API error objects to be rendered in the document.
The interface defines two methods:
* `getJsonApiStatus` which must return a string.
* `getJsonApiErrors` which must return an array of JSON-serializable content, such as [json-api-php](https://github.com/json-api-php/json-api) error objects
```php
use JsonApiPhp\JsonApi\Error;
use Tobyz\JsonApiServer\ErrorProviderInterface;
class ImATeapotException implements ErrorProviderInterface
{
public function getJsonApiErrors(): array
{
return [
new Error(
new Error\Title("I'm a teapot"),
new Error\Status($this->getJsonApiStatus())
)
];
}
public function getJsonApiStatus(): string
{
return '418';
}
}
```
Exceptions that do not implement this interface will result in a generic `500 Internal Server Error` response.