How to Make My Flask Development Server Accessible from Other Devices on My Network?

How to Make Flask Development Server Accessible on Network

When running a Flask application in development mode, it's often desirable to access the server from other devices on the network. However, by default, the Flask development server is only visible on the local machine.

Configure Flask Dev Server for Network Visibility

To make the Flask development server accessible to other machines on the network, it's recommended to use the --host option when running the server:

flask run --host=0.0.0.0

This option instructs the server to listen on all network interfaces, including the one facing the network.

Note on Production Environment

It's important to note that the Flask development server is not intended for production use. It's not secure, stable, or efficient. For production environments, refer to the official Flask documentation on deployment.

Firewall Configuration

After configuring the server to listen on the network interface, you may need to adjust your firewall settings to allow external access to the port (usually port 5000).

Example from Quickstart Docs

The Flask quickstart documentation also provides an example:

$ flask run --host=0.0.0.0

This command tells the operating system to listen on all public IP addresses, making the server publicly accessible.

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