> ## Documentation Index
> Fetch the complete documentation index at: https://gofastmcp.com/llms.txt
> Use this file to discover all available pages before exploring further.
# in_memory
# `fastmcp.server.auth.providers.in_memory`
## Classes
### `InMemoryOAuthProvider`
An in-memory OAuth provider for testing purposes.
It simulates the OAuth 2.1 flow locally without external calls.
**Methods:**
#### `get_client`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
get_client(self, client_id: str) -> OAuthClientInformationFull | None
```
#### `register_client`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
register_client(self, client_info: OAuthClientInformationFull) -> None
```
#### `authorize`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
authorize(self, client: OAuthClientInformationFull, params: AuthorizationParams) -> str
```
Simulates user authorization and generates an authorization code.
Returns a redirect URI with the code and state.
#### `load_authorization_code`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
load_authorization_code(self, client: OAuthClientInformationFull, authorization_code: str) -> AuthorizationCode | None
```
#### `exchange_authorization_code`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
exchange_authorization_code(self, client: OAuthClientInformationFull, authorization_code: AuthorizationCode) -> OAuthToken
```
#### `load_refresh_token`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
load_refresh_token(self, client: OAuthClientInformationFull, refresh_token: str) -> RefreshToken | None
```
#### `exchange_refresh_token`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
exchange_refresh_token(self, client: OAuthClientInformationFull, refresh_token: RefreshToken, scopes: list[str]) -> OAuthToken
```
#### `load_access_token`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
load_access_token(self, token: str) -> AccessToken | None
```
#### `verify_token`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
verify_token(self, token: str) -> AccessToken | None
```
Verify a bearer token and return access info if valid.
This method implements the TokenVerifier protocol by delegating
to our existing load\_access\_token method.
**Args:**
* `token`: The token string to validate
**Returns:**
* AccessToken object if valid, None if invalid or expired
#### `revoke_token`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
revoke_token(self, token: AccessToken | RefreshToken) -> None
```
Revokes an access or refresh token and its counterpart.