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# Civetweb API Reference
### `mg_get_user_connection_data( conn );`
### Parameters
| Parameter | Type | Description |
| :--- | :--- | :--- |
|**`conn`**|`const struct mg_connection *`|The connection for which to return the user data|
### Return Value
| Type | Description |
| :--- | :--- |
|`void *`|A pointer to the user data, or NULL if no user data was registered with the connection|
### Description
The function `mg_get_user_connection_data()` returns the user data associated with a connection. This user data is represented with a pointer which has been prevously registered with a call to [`mg_set_user_connection_data();`](mg_set_user_connection_data.md). With this function it is possible to pass state information between callback functions refering to a specific connection.
### See Also
* [`mg_set_user_connection_data();`](mg_set_user_connection_data.md)
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