What is the default login for self-hosted Langfuse?
There is no default username or password. After you start a new instance, open the UI (for example http://localhost:3000) and click Sign up to create the first user. The user who creates an organization becomes its Owner.
To create a user, organization, project, and API keys automatically on startup, use headless initialization with the LANGFUSE_INIT_* environment variables, for example LANGFUSE_INIT_ORG_ID, LANGFUSE_INIT_PROJECT_ID, LANGFUSE_INIT_PROJECT_PUBLIC_KEY, LANGFUSE_INIT_PROJECT_SECRET_KEY, LANGFUSE_INIT_USER_EMAIL, and LANGFUSE_INIT_USER_PASSWORD. The initial user is created only when both LANGFUSE_INIT_USER_EMAIL and LANGFUSE_INIT_USER_PASSWORD are set, and it becomes Owner of the initial organization. Initialization does not change the password of a user that already exists.
To control who can access the instance afterwards:
- Disable open sign-up with
AUTH_DISABLE_SIGNUP=true(hardening). This also blocks invited users who do not have an account yet. - Restrict who can create organizations with
LANGFUSE_ALLOWED_ORGANIZATION_CREATORS. - Add new users to an existing organization automatically with
LANGFUSE_DEFAULT_ORG_IDandLANGFUSE_DEFAULT_ORG_ROLE.
If you forgot the password of an existing user, see I forgot my password.
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