fastmcp/docs/python-sdk/fastmcp-settings.mdx
2025-07-18 10:19:16 -05:00

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---
title: settings
sidebarTitle: settings
---
# `fastmcp.settings`
## Classes
### `ExtendedEnvSettingsSource` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/settings.py#L27" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
A special EnvSettingsSource that allows for multiple env var prefixes to be used.
Raises a deprecation warning if the old `FASTMCP_SERVER_` prefix is used.
**Methods:**
#### `get_field_value` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/settings.py#L34" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
```python
get_field_value(self, field: FieldInfo, field_name: str) -> tuple[Any, str, bool]
```
### `ExtendedSettingsConfigDict` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/settings.py#L54" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
### `Settings` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/settings.py#L58" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
FastMCP settings.
**Methods:**
#### `settings_customise_sources` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/settings.py#L70" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
```python
settings_customise_sources(cls, settings_cls: type[BaseSettings], init_settings: PydanticBaseSettingsSource, env_settings: PydanticBaseSettingsSource, dotenv_settings: PydanticBaseSettingsSource, file_secret_settings: PydanticBaseSettingsSource) -> tuple[PydanticBaseSettingsSource, ...]
```
#### `settings` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/settings.py#L88" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
```python
settings(self) -> Self
```
This property is for backwards compatibility with FastMCP < 2.8.0,
which accessed fastmcp.settings.settings
#### `normalize_log_level` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/settings.py#L107" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
```python
normalize_log_level(cls, v)
```
#### `setup_logging` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/settings.py#L175" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
```python
setup_logging(self) -> Self
```
Finalize the settings.