⛓️ LangFlow

~ A User Interface For LangChain ~

LangFlow is a GUI for LangChain, designed with react-flow to provide an effortless way to experiment and prototype flows with drag-and-drop components and a chat box.

📦 Installation

Locally

You can install LangFlow from pip:

pip install langflow

Next, run:

python -m langflow

langflow

Deploy Langflow on Google Cloud Platform

Follow our step-by-step guide to deploy Langflow on Google Cloud Platform (GCP) using Google Cloud Shell. The guide is available in the Langflow in Google Cloud Platform document.

Alternatively, click the "Open in Cloud Shell" button below to launch Google Cloud Shell, clone the Langflow repository, and start an interactive tutorial that will guide you through the process of setting up the necessary resources and deploying Langflow on your GCP project.

Deploy Langflow on Jina AI Cloud

Langflow integrates with langchain-serve to provide a one-command deployment to Jina AI Cloud.

Start by installing langchain-serve with

pip install -U langchain-serve

Then, run:

langflow --jcloud

🎉 Langflow server successfully deployed on Jina AI Cloud 🎉
🔗 Click on the link to open the server (please allow ~1-2 minutes for the server to startup): https://<your-app>.wolf.jina.ai/
📖 Read more about managing the server: https://github.com/jina-ai/langchain-serve

Show complete (example) output

  🚀 Deploying Langflow server on Jina AI Cloud
  ╭───────────────────────── 🎉 Flow is available! ──────────────────────────╮
  │                                                                          │
  │   ID                    langflow-e3dd8820ec                              │
  │   Gateway (Websocket)   wss://langflow-e3dd8820ec.wolf.jina.ai           │
  │   Dashboard             https://dashboard.wolf.jina.ai/flow/e3dd8820ec   │
  │                                                                          │
  ╰──────────────────────────────────────────────────────────────────────────╯
  ╭──────────────┬──────────────────────────────────────────────────────────────────────────────╮
  │ App ID       │                     langflow-e3dd8820ec                                      │
  ├──────────────┼──────────────────────────────────────────────────────────────────────────────┤
  │ Phase        │                            Serving                                           │
  ├──────────────┼──────────────────────────────────────────────────────────────────────────────┤
  │ Endpoint     │          wss://langflow-e3dd8820ec.wolf.jina.ai                              │
  ├──────────────┼──────────────────────────────────────────────────────────────────────────────┤
  │ App logs     │                  dashboards.wolf.jina.ai                                     │
  ├──────────────┼──────────────────────────────────────────────────────────────────────────────┤
  │ Swagger UI   │          https://langflow-e3dd8820ec.wolf.jina.ai/docs                       │
  ├──────────────┼──────────────────────────────────────────────────────────────────────────────┤
  │ OpenAPI JSON │        https://langflow-e3dd8820ec.wolf.jina.ai/openapi.json                 │
  ╰──────────────┴──────────────────────────────────────────────────────────────────────────────╯

  🎉 Langflow server successfully deployed on Jina AI Cloud 🎉
  🔗 Click on the link to open the server (please allow ~1-2 minutes for the server to startup): https://langflow-e3dd8820ec.wolf.jina.ai/
  📖 Read more about managing the server: https://github.com/jina-ai/langchain-serve

API Usage

You can use Langflow directly on your browser, or use the API endpoints on Jina AI Cloud to interact with the server.

Show API usage (with python)

import json
import requests

FLOW_PATH = "Time_traveller.json"

# HOST = 'http://localhost:7860'
HOST = 'https://langflow-f1ed20e309.wolf.jina.ai'
API_URL = f'{HOST}/predict'

def predict(message):
    with open(FLOW_PATH, "r") as f:
        json_data = json.load(f)
    payload = {'exported_flow': json_data, 'message': message}
    response = requests.post(API_URL, json=payload)
    return response.json()


predict('Take me to 1920s Bangalore')

{
  "result": "Great choice! Bangalore in the 1920s was a vibrant city with a rich cultural and political scene. Here are some suggestions for things to see and do:\n\n1. Visit the Bangalore Palace - built in 1887, this stunning palace is a perfect example of Tudor-style architecture. It was home to the Maharaja of Mysore and is now open to the public.\n\n2. Attend a performance at the Ravindra Kalakshetra - this cultural center was built in the 1920s and is still a popular venue for music and dance performances.\n\n3. Explore the neighborhoods of Basavanagudi and Malleswaram - both of these areas have retained much of their old-world charm and are great places to walk around and soak up the atmosphere.\n\n4. Check out the Bangalore Club - founded in 1868, this exclusive social club was a favorite haunt of the British expat community in the 1920s.\n\n5. Attend a meeting of the Indian National Congress - founded in 1885, the INC was a major force in the Indian independence movement and held many meetings and rallies in Bangalore in the 1920s.\n\nHope you enjoy your trip to 1920s Bangalore!"
}

Read more about resource customization, cost, and management of Langflow apps on Jina AI Cloud in the langchain-serve repository.

🎨 Creating Flows

Creating flows with LangFlow is easy. Simply drag sidebar components onto the canvas and connect them together to create your pipeline. LangFlow provides a range of LangChain components to choose from, including LLMs, prompt serializers, agents, and chains.

Explore by editing prompt parameters, link chains and agents, track an agent's thought process, and export your flow.

Once you're done, you can export your flow as a JSON file to use with LangChain. To do so, click the "Export" button in the top right corner of the canvas, then in Python, you can load the flow with:

from langflow import load_flow_from_json

flow = load_flow_from_json("path/to/flow.json")
# Now you can use it like any chain
flow("Hey, have you heard of LangFlow?")

👋 Contributing

We welcome contributions from developers of all levels to our open-source project on GitHub. If you'd like to contribute, please check our contributing guidelines and help make LangFlow more accessible.

📄 License

LangFlow is released under the MIT License. See the LICENSE file for details.

jimmyliao / langflow