Authentication

The login functionality in Langflow serves to authenticate users and protect sensitive routes in the application.

Starting from version 0.5, Langflow introduces an enhanced login mechanism that is governed by a few environment variables. This allows new secure features.

Create a superuser and new users in Langflow

Learn how to create a new superuser, log in to Langflow, and add new users.

1. Create a .env file and open it in your preferred editor.

2. Add the following environment variables to your file.

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LANGFLOW_AUTO_LOGIN=False

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LANGFLOW_SUPERUSER=admin

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LANGFLOW_SUPERUSER_PASSWORD=securepassword

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LANGFLOW_SECRET_KEY=randomly_generated_secure_key

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LANGFLOW_NEW_USER_IS_ACTIVE=False

For more information, see Authentication configuration values.

tip

The Langflow project includes a .env.example file to help you get started. You can copy the contents of this file into your own .env file and replace the example values with your own preferred settings.

3. Save your .env file.
4. Run Langflow with the configured environment variables.

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python -m langflow run --env-file .env

5. Sign in with your username admin and password securepassword.
6. To open the Admin Page, click your user profile image, and then select Admin Page. You can also go to http://127.0.0.1:7861/admin.
7. To add a new user, click New User, and then add the Username and Password.
8. To activate the new user, select Active. The user can only sign in if you select them as Active.
9. To give the user superuser priveleges, click Superuser.
10. Click Save.
11. To confirm your new user has been created, sign out of Langflow, and then sign back in using your new Username and Password.

Manage Superuser with the Langflow CLI

Langflow provides a command-line utility for interactively creating superusers:

1. Enter the CLI command:

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langflow superuser

2. Langflow prompts you for a Username and Password:

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langflow superuser

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Username: new_superuser_1

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Password:

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Default folder created successfully.

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Superuser created successfully.

3. To confirm your new superuser was created successfully, go to the Admin Page at http://127.0.0.1:7861/admin.

Authentication configuration values

The following table lists the available authentication configuration variables, their descriptions, and default values:

Variable	Description	Default
LANGFLOW_AUTO_LOGIN	Enables automatic login	True
LANGFLOW_SUPERUSER	Superuser username	-
LANGFLOW_SUPERUSER_PASSWORD	Superuser password	-
LANGFLOW_SECRET_KEY	Key for encrypting superuser password	-
LANGFLOW_NEW_USER_IS_ACTIVE	Automatically activates new users	False

LANGFLOW_AUTO_LOGIN

By default, this variable is set to True. When enabled, Langflow operates as it did in versions prior to 0.5, including automatic login without requiring explicit user authentication.

To disable automatic login and enforce user authentication:

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export LANGFLOW_AUTO_LOGIN=False

LANGFLOW_SUPERUSER and LANGFLOW_SUPERUSER_PASSWORD

These environment variables are only relevant when LANGFLOW_AUTO_LOGIN is set to False. They specify the username and password for the superuser, which is essential for administrative tasks. To create a superuser manually:

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export LANGFLOW_SUPERUSER=admin

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export LANGFLOW_SUPERUSER_PASSWORD=securepassword

LANGFLOW_SECRET_KEY

This environment variable holds a secret key used for encrypting the superuser's password. Make sure to set this to a secure, randomly generated string.

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export LANGFLOW_SECRET_KEY=randomly_generated_secure_key

LANGFLOW_NEW_USER_IS_ACTIVE

By default, this variable is set to False. When enabled, new users are automatically activated and can log in without requiring explicit activation by the superuser.