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Welcome to Chainlit 👋

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Build a production ready Chat GPT like application in minutes ⚡️

Chainlit is an open-source async Python framework that makes it incredibly fast to build Chat GPT like applications with your own business logic and data.

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intro.mp4

Installation

Open a terminal and run:

$ pip install chainlit
$ chainlit hello

If this opens the hello app in your browser, you're all set!

📖 Documentation

Please see here for full documentation on:

  • Getting started (installation, simple examples)
  • Examples
  • Reference (full API docs)

🚀 Quickstart

🐍 Pure Python

Create a new file demo.py with the following code:

import chainlit as cl


@cl.step
def tool():
    return "Response from the tool!"


@cl.on_message  # this function will be called every time a user inputs a message in the UI
async def main(message: cl.Message):
    """
    This function is called every time a user inputs a message in the UI.
    It sends back an intermediate response from the tool, followed by the final answer.

    Args:
        message: The user's message.

    Returns:
        None.
    """

    # Call the tool
    tool()

    # Send the final answer.
    await cl.Message(content="This is the final answer").send()

Now run it!

$ chainlit run demo.py -w

Quick Start

🔗 Integrations

Chainlit is compatible with all Python programs and libraries. That being said, it comes with integrations for:

🎨 Custom Frontend

Chainlit allows you to create a custom frontend for your application, offering you the flexibility to design a unique user experience. By integrating your frontend with Chainlit's backend, you can harness the full power of Chainlit's features, including:

  • Abstractions for easier development
  • Monitoring and observability
  • Seamless integrations with various tools
  • Robust authentication mechanisms
  • Support for multi-user environments
  • Efficient data streaming capabilities

To build and connect your own frontend, check out our Custom Frontend Cookbook.

📚 More Examples - Cookbook

You can find various examples of Chainlit apps here that leverage tools and services such as OpenAI, Anthropiс, LangChain, LlamaIndex, ChromaDB, Pinecone and more.

Tell us what you would like to see added in Chainlit using the Github issues or on Discord.

💁 Contributing

As an open-source initiative in a rapidly evolving domain, we welcome contributions, be it through the addition of new features or the improvement of documentation.

For detailed information on how to contribute, see here.

📃 License

Chainlit is open-source and licensed under the Apache 2.0 license.

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