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# Unmarshalling
Unmarshalling is the process of converting a primitive schema type value into a higher-level object based on a `format` keyword. All request/response data that can be described by a schema in the OpenAPI specification can be unmarshalled.
Unmarshallers first validate data against the provided schema (See [Validation](validation.md)).
Openapi-core comes with a set of built-in format unmarshallers:
- `date` - converts a string into a date object,
- `date-time` - converts a string into a datetime object,
- `binary` - converts a string into a byte object,
- `uuid` - converts a string into a UUID object,
- `byte` - decodes a Base64-encoded string.
!!! note
For backward compatibility, OpenAPI 3.1 unmarshalling in openapi-core currently supports `byte` and `binary` format handling.
You can also define your own format unmarshallers (See [Extra Format Unmarshallers](configuration.md#extra-format-unmarshallers)).
## Request unmarshalling
Use the `unmarshal_request` method to validate and unmarshal request data against a given spec. By default, the OpenAPI spec version is detected:
```python
# raises an error if the request is invalid
result = openapi.unmarshal_request(request)
```
The request object should implement the OpenAPI Request protocol (See [Integrations](integrations/index.md)).
!!! note
The Webhooks feature is part of OpenAPI v3.1+.
Use the same method to validate and unmarshal webhook request data against a given spec.
```python
# raises an error if the request is invalid
result = openapi.unmarshal_request(webhook_request)
```
The webhook request object should implement the OpenAPI WebhookRequest protocol (See [Integrations](integrations/index.md)).
Retrieve validated and unmarshalled request data:
```python
# get parameters
path_params = result.parameters.path
query_params = result.parameters.query
cookies_params = result.parameters.cookies
headers_params = result.parameters.headers
# get body
body = result.body
# get security data
security = result.security
```
You can also define your own request unmarshaller (See [Request Unmarshaller](configuration.md#request-unmarshaller)).
## Response unmarshalling
Use the `unmarshal_response` method to validate and unmarshal response data against a given spec. By default, the OpenAPI spec version is detected:
```python
# raises an error if the response is invalid
result = openapi.unmarshal_response(request, response)
```
The response object should implement the OpenAPI Response protocol (See [Integrations](integrations/index.md)).
!!! note
The Webhooks feature is part of OpenAPI v3.1+.
Use the same method to validate and unmarshal response data from a webhook request against a given spec.
```python
# raises an error if the request is invalid
result = openapi.unmarshal_response(webhook_request, response)
```
Retrieve validated and unmarshalled response data:
```python
# get headers
headers = result.headers
# get data
data = result.data
```
You can also define your own response unmarshaller (See [Response Unmarshaller](configuration.md#response-unmarshaller)).