Skip to main content

Environment variables

Below is the list of useful environment variables and their default values:

FLET_APP_CONSOLE​

The path to the application's console log file (console.log) in the temporary storage directory.

Its value is set in production mode.

FLET_APP_STORAGE_DATA​

A directory for the storage of persistent application data that is preserved between app updates. It is already pre-created and its location depends on the platform the app is running on.

FLET_APP_STORAGE_TEMP​

A directory for the storage of temporary application files, i.e. cache. It is already pre-created and its location depends on the platform the app is running on.

FLET_ASSETS_DIR​

Absolute path to app "assets" directory.

Defaults to assets.

FLET_CLI_NO_RICH_OUTPUT​

Whether to disable rich output in the console.

Default is "false".

FLET_PLATFORM​

The platform on which the application is running. Its value is one of the following: "android", "ios", "linux", "macos", "windows" or "fuchsia".

FLET_CLI_SKIP_FLUTTER_DOCTOR​

Whether to skip running flutter doctor when a build fails.

Default is False.

FLET_FORCE_WEB_SERVER​

Set to true to force running app as a web app. Automatically set on headless Linux hosts.

FLET_OAUTH_CALLBACK_HANDLER_ENDPOINT​

Custom path for OAuth handler.

Defaults to /oauth_callback.

FLET_OAUTH_STATE_TIMEOUT​

Maximum allowed time (in seconds) to complete OAuth web flow.

Defaults to 600.

FLET_MAX_UPLOAD_SIZE​

Maximum allowed size (in bytes) of uploaded files.

Default is unlimited.

FLET_SECRET_KEY​

A secret key to sign temporary upload URLs.

FLET_SERVER_IP​

IP address to listen web app on, e.g. 127.0.0.1.

Defaults to 0.0.0.0 - bound to all server IPs.

FLET_SERVER_PORT​

TCP port to run app on. 8000 if the program is running on a Linux server or FLET_FORCE_WEB_SERVER is set; otherwise random port.

FLET_SERVER_UDS_PATH​

The Unix Domain Socket (UDS) path for the Flet server. It enables inter-process communication on Unix-based systems, with its value being a socket file path in the format flet_<pid>.sock.

FLET_SESSION_TIMEOUT​

Session lifetime in seconds. Default is 3600.

FLET_UPLOAD_DIR​

Absolute path to app "upload" directory.

FLET_UPLOAD_HANDLER_ENDPOINT​

Custom path for upload handler. Default is /upload.

FLET_WEB_APP_PATH​

A URL path after domain name to host web app under, e.g. /apps/myapp. Default is / - host app in the root.

FLET_WEBSOCKET_HANDLER_ENDPOINT​

Custom path for WebSocket handler. Default is /ws.

FLET_WEB_RENDERER​

Web rendering mode: canvaskit (default), html or auto.

FLET_WEB_USE_COLOR_EMOJI​

Set to True, true or 1 to load web font with colorful emojis.

FLET_WEB_ROUTE_URL_STRATEGY​

The URL strategy of the web application: path (default) or hash.

Setting Boolean values​

The boolean True is represented by one of the following string values: "true", "1" or "yes". Any other value will be interpreted as False.