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Install LFX

docs/versioned_docs/version-1.11.0/Lfx/lfx-install.mdx

1.12.0.dev32.2 KB
Original Source

import PartialExtensionBundleInstall from '@site/docs/_partial-extension-bundle-install.mdx';

LFX can be installed from PyPI, cloned from the Langflow repository, or run without installing using uvx.

If you have installed Langflow OSS version 1.6 or later, lfx is already included in your environment.

Prerequisites

Install from PyPI

  1. Create and activate a virtual environment:

    bash
    uv venv lfx-venv
source lfx-venv/bin/activate

  2. Install LFX:

    bash
    uv pip install lfx

    To install the latest nightly (pre-release) version:

    bash
    uv pip install --pre lfx

Install with bundle components

Install the LFX engine and any provider extensions your flows need.

<PartialExtensionBundleInstall />

Clone the Langflow repository

To run LFX from source without a PyPI install:

  1. Clone the Langflow repository:

    bash
    git clone https://github.com/langflow-ai/langflow

  2. Change directory to src/lfx:

    bash
    cd langflow/src/lfx

  3. Run lfx commands using uv run:

    bash
    uv run lfx serve my-flow.json

Running uv run lfx from src/lfx installs the LFX engine only. Bundle components will still need to be installed. To use bundle components, see Install with bundle components, or run make init from the repository root to install the full Langflow development workspace.

Run without installing

Use uvx to run LFX in a temporary environment without a permanent install:

bash
uvx lfx serve my-flow.json

uvx downloads and caches LFX automatically. This is useful for one-off flow runs or CI pipelines where you do not want to manage a virtual environment.

Verify the installation

After installing, confirm LFX is available:

bash
lfx --version

To list available commands:

bash
lfx --help

See also