Skip to main content

Deploy a public Langflow server

By default, your Langflow server at http://localhost:7860 isn't exposed to the public internet. However, you can forward Langflow server traffic with a forwarding platform like ngrok or zrok to make your server public.

When your Langflow server is public, you can do things like deploy your Langflow MCP server externally, serve API requests, and share a flow's Playground publicly.

Prerequisites​

Expose your Langflow server with ngrok​

  1. Start Langflow:


    _10
    uv run langflow run

  2. In another terminal window, use your ngrok authtoken to authenticate your local ngrok server:


    _10
    ngrok config add-authtoken NGROK_AUTHTOKEN

  3. Use ngrok to expose your Langflow server to the public internet:


    _10
    ngrok http http://localhost:7860

    This example assumes that you use the default Langflow listening address at http://localhost:7860. If you have a different listening address, you must modify this command accordingly.

    The ngrok session starts in your terminal and deploys an ephemeral domain with no authentication. To add authentication or deploy a static domain, see the ngrok documentation.

    The Forwarding line prints the forwarding address for your Langflow server:


    _10
    Forwarding https://94b1-76-64-171-14.ngrok-free.app -> http://localhost:7860

    The forwarding address acts as a reverse proxy for your Langflow server, and ngrok forwards your local traffic to this domain.

  4. To verify that your Langflow server is publicly available, navigate to the forwarding address URL, such as https://94b1-76-64-171-14.ngrok-free.app.

Use a public Langflow server​

When your Langflow server is public, you can do things like deploy your Langflow MCP server externally, serve API requests, and share a flow's Playground publicly.

Deploy your MCP server externally​

After you deploy a public Langflow server, you can also access your Langflow projects' MCP servers publicly.

To do this, use your server's forwarding address when you connect a client to a Langflow MCP server.

Serve API requests​

To send requests to a public Langflow server's Langflow API endpoints, use the server's domain as the base URL for your API requests. For example:


_10
curl -X POST \
_10
"PUBLIC_SERVER_DOMAIN/api/v1/webhook/FLOW_ID" \
_10
-H "Content-Type: application/json" \
_10
-H "x-api-key: LANGFLOW_API_KEY" \
_10
-d '{"data": "example-data"}'

tip

For flows created on public Langflow servers, the code snippets generated in the API access pane automatically use your public server's domain.

You also use your public domain when making Langflow API calls in scripts, including the code snippets that are automatically generated by Langflow. For example, the following code snippet calls an ngrok domain to trigger the specified flow (d764c4b8...):


_29
import requests
_29
_29
url = "https://3f7c-73-64-93-151.ngrok-free.app/api/v1/run/d764c4b8-5cec-4c0f-9de0-4b419b11901a" # The complete API endpoint URL for this flow
_29
_29
# Request payload configuration
_29
payload = {
_29
"output_type": "chat",
_29
"input_type": "chat",
_29
"input_value": "Hello"
_29
}
_29
_29
# Request headers
_29
headers = {
_29
"Content-Type": "application/json",
_29
"x-api-key: LANGFLOW_API_KEY"
_29
}
_29
_29
try:
_29
# Send API request
_29
response = requests.request("POST", url, json=payload, headers=headers)
_29
response.raise_for_status() # Raise exception for bad status codes
_29
_29
# Print response
_29
print(response.text)
_29
_29
except requests.exceptions.RequestException as e:
_29
print(f"Error making API request: {e}")
_29
except ValueError as e:
_29
print(f"Error parsing response: {e}")

For a demo of the Langflow API in a script, see the Quickstart.

Share a flow's Playground​

After you deploy a public Langflow server, you can use the Shareable Playground option to make a flow's Playground available at a public URL. If a user accesses this URL, they can interact with the flow's chat input and output and view the results without installing Langflow or generating a Langflow API key.

For more information, see Share a flow's Playground.

Search