2b4e720e36
fix: fail-fast on unresolvable SQLite path; stop temp_dirs masking startup errors Addresses #13634 (Bug 2 in full; Bug 1 diagnostics + docs — relative-path normalization deferred to a separate design decision per maintainer triage). - main.py: bind `temp_dirs = []` before the lifespan `try` so the shutdown `finally` cleanup never raises UnboundLocalError and masks the real startup error when failure occurs before bundle loading. - database/service.py: add get_sqlite_database_file_path() and check_sqlite_database_path(), surfacing an actionable error (resolved path, CWD anchoring, absolute-path guidance) when a SQLite DB's parent directory is missing — instead of the opaque "Error creating DB and tables". Diagnostics only: no path normalization, no directory creation, no rejection of currently-working relative paths. - database/utils.py: run the check in initialize_database() before creation. - docs: note that SQLite LANGFLOW_DATABASE_URL paths should be absolute. - tests: regression coverage for both bugs. Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
Langflow is a powerful platform for building and deploying AI-powered agents and workflows. It provides developers with both a visual authoring experience and built-in API and MCP servers that turn every workflow into a tool that can be integrated into applications built on any framework or stack. Langflow comes with batteries included and supports all major LLMs, vector databases and a growing library of AI tools.
✨ Highlight features
- Visual builder interface to quickly get started and iterate.
- Source code access lets you customize any component using Python.
- Interactive playground to immediately test and refine your flows with step-by-step control.
- Multi-agent orchestration with conversation management and retrieval.
- Deploy as an API or export as JSON for Python apps.
- Deploy as an MCP server and turn your flows into tools for MCP clients.
- Observability with LangSmith, LangFuse and other integrations.
- Enterprise-ready security and scalability.
🖥️ Langflow Desktop
Langflow Desktop is the easiest way to get started with Langflow. All dependencies are included, so you don't need to manage Python environments or install packages manually. Available for Windows and macOS.
⚡️ Quickstart
Install locally (recommended)
Requires Python 3.10–3.14 and uv (recommended package manager).
Install
From a fresh directory, run:
uv pip install langflow -U
The latest Langflow package is installed. For more information, see Install and run the Langflow OSS Python package.
Run
To start Langflow, run:
uv run langflow run
Langflow starts at http://127.0.0.1:7860.
That's it! You're ready to build with Langflow! 🎉
📦 Other install options
Run from source
If you've cloned this repository and want to contribute, run this command from the repository root:
make run_cli
For more information, see DEVELOPMENT.md.
Docker
Start a Langflow container with default settings:
docker run -p 7860:7860 langflowai/langflow:latest
Langflow is available at http://localhost:7860/. For configuration options, see the Docker deployment guide.
🛡️ Security
For security information, see our Security Policy.
🚀 Deployment
Langflow is completely open source and you can deploy it to all major deployment clouds. To learn how to deploy Langflow, see our Langflow deployment guides.
⭐ Stay up-to-date
Star Langflow on GitHub to be instantly notified of new releases.
👋 Contribute
We welcome contributions from developers of all levels. If you'd like to contribute, please check our contributing guidelines and help make Langflow more accessible.