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Chat Ui

Open source codebase powering the HuggingChat app

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Chat UI

Find the docs at hf.co/docs/chat-ui.

A chat interface using open source models, eg OpenAssistant or Llama. It is a SvelteKit app and it powers the HuggingChat app on hf.co/chat.

  1. Quickstart
  2. No Setup Deploy
  3. Setup
  4. Launch
  5. Web Search
  6. Text Embedding Models
  7. Extra parameters
  8. Common issues
  9. Deploying to a HF Space
  10. Building

Quickstart

Docker image

You can deploy a chat-ui instance in a single command using the docker image. Get your huggingface token from here.

docker run -p 3000 -e HF_TOKEN=hf_*** -v db:/data ghcr.io/huggingface/chat-ui-db:latest

Take a look at the .env file and the readme to see all the environment variables that you can set. We have endpoint support for all OpenAI API compatible local services as well as many other providers like Anthropic, Cloudflare, Google Vertex AI, etc.

Local setup

You can quickly start a locally running chat-ui & LLM text-generation server thanks to chat-ui's llama.cpp server support.

Step 1 (Start llama.cpp server):

Install llama.cpp w/ brew (for Mac):

# install llama.cpp
brew install llama.cpp

or build directly from the source for your target device:

git clone https://github.com/ggerganov/llama.cpp && cd llama.cpp && make

Next, start the server with the LLM of your choice:

# start llama.cpp server (using hf.co/microsoft/Phi-3-mini-4k-instruct-gguf as an example)
llama-server --hf-repo microsoft/Phi-3-mini-4k-instruct-gguf --hf-file Phi-3-mini-4k-instruct-q4.gguf -c 4096

A local LLaMA.cpp HTTP Server will start on http://localhost:8080. Read more here.

Step 3 (make sure you have MongoDb running locally):

docker run -d -p 27017:27017 --name mongo-chatui mongo:latest

Read more here.

Step 4 (clone chat-ui):

git clone https://github.com/huggingface/chat-ui
cd chat-ui

Step 5 (tell chat-ui to use local llama.cpp server):

Add the following to your .env.local:

MODELS=`[
  {
    "name": "microsoft/Phi-3-mini-4k-instruct",
    "endpoints": [{
      "type" : "llamacpp",
      "baseURL": "http://localhost:8080"
    }],
  },
]`

Read more here.

Step 6 (start chat-ui):

npm install
npm run dev -- --open

Read more here.

No Setup Deploy

If you don't want to configure, setup, and launch your own Chat UI yourself, you can use this option as a fast deploy alternative.

You can deploy your own customized Chat UI instance with any supported LLM of your choice on Hugging Face Spaces. To do so, use the chat-ui template available here.

Set HF_TOKEN in Space secrets to deploy a model with gated access or a model in a private repository. It's also compatible with Inference for PROs curated list of powerful models with higher rate limits. Make sure to create your personal token first in your User Access Tokens settings.

Read the full tutorial here.

Setup

The default config for Chat UI is stored in the .env file. You will need to override some values to get Chat UI to run locally. This is done in .env.local.

Start by creating a .env.local file in the root of the repository. The bare minimum config you need to get Chat UI to run locally is the following:

MONGODB_URL=<the URL to your MongoDB instance>
HF_TOKEN=<your access token>

Database

The chat history is stored in a MongoDB instance, and having a DB instance available is needed for Chat UI to work.

You can use a local MongoDB instance. The easiest way is to spin one up using docker:

docker run -d -p 27017:27017 --name mongo-chatui mongo:latest

In which case the url of your DB will be MONGODB_URL=mongodb://localhost:27017.

Alternatively, you can use a free MongoDB Atlas instance for this, Chat UI should fit comfortably within their free tier. After which you can set the MONGODB_URL variable in .env.local to match your instance.

Hugging Face Access Token

If you use a remote inference endpoint, you will need a Hugging Face access token to run Chat UI locally. You can get one from your Hugging Face profile.

Launch

After you're done with the .env.local file you can run Chat UI locally with:

npm install
npm run dev

Chat UI features a powerful Web Search feature. It works by:

  1. Generating an appropriate search query from the user prompt.
  2. Performing web search and extracting content from webpages.
  3. Creating embeddings from texts using a text embedding model.
  4. From these embeddings, find the ones that are closest to the user query using a vector similarity search. Specifically, we use inner product distance.
  5. Get the corresponding texts to those closest embeddings and perform Retrieval-Augmented Generation (i.e. expand user prompt by adding those texts so that an LLM can use this information).

Text Embedding Models

By default (for backward compatibility), when TEXT_EMBEDDING_MODELS environment variable is not defined, transformers.js embedding models will be used for embedding tasks, specifically, Xenova/gte-small model.

You can customize the embedding model by setting TEXT_EMBEDDING_MODELS in your .env.local file. For example:

TEXT_EMBEDDING_MODELS = `[
  {
    "name": "Xenova/gte-small",
    "displayName": "Xenova/gte-small",
    "description": "locally running embedding",
    "chunkCharLength": 512,
    "endpoints": [
      {"type": "transformersjs"}
    ]
  },
  {
    "name": "intfloat/e5-base-v2",
    "displayName": "intfloat/e5-base-v2",
    "description": "hosted embedding model",
    "chunkCharLength": 768,
    "preQuery": "query: ", # See https://huggingface.co/intfloat/e5-base-v2#faq
    "prePassage": "passage: ", # See https://huggingface.co/intfloat/e5-base-v2#faq
    "endpoints": [
      {
        "type": "tei",
        "url": "http://127.0.0.1:8080/",
        "authorization": "TOKEN_TYPE TOKEN" // optional authorization field. Example: "Basic VVNFUjpQQVNT"
      }
    ]
  }
]`

The required fields are name, chunkCharLength and endpoints. Supported text embedding backends are: transformers.js, TEI and OpenAI. transformers.js models run locally as part of chat-ui, whereas TEI models run in a different environment & accessed through an API endpoint. openai models are accessed through the OpenAI API.

When more than one embedding models are supplied in .env.local file, the first will be used by default, and the others will only be used on LLM's which configured embeddingModel to the name of the model.

Extra parameters

OpenID connect

The login feature is disabled by default and users are attributed a unique ID based on their browser. But if you want to use OpenID to authenticate your users, you can add the following to your .env.local file:

OPENID_CONFIG=`{
  PROVIDER_URL: "<your OIDC issuer>",
  CLIENT_ID: "<your OIDC client ID>",
  CLIENT_SECRET: "<your OIDC client secret>",
  SCOPES: "openid profile",
  TOLERANCE: // optional
  RESOURCE: // optional
}`

These variables will enable the openID sign-in modal for users.

Trusted header authentication

You can set the env variable TRUSTED_EMAIL_HEADER to point to the header that contains the user's email address. This will allow you to authenticate users from the header. This setup is usually combined with a proxy that will be in front of chat-ui and will handle the auth and set the header.

[!WARNING] Make sure to only allow requests to chat-ui through your proxy which handles authentication, otherwise users could authenticate as anyone by setting the header manually! Only set this up if you understand the implications and know how to do it correctly.

Here is a list of header names for common auth providers:

  • Tailscale Serve: Tailscale-User-Login
  • Cloudflare Access: Cf-Access-Authenticated-User-Email
  • oauth2-proxy: X-Forwarded-Email

Theming

You can use a few environment variables to customize the look and feel of chat-ui. These are by default:

PUBLIC_APP_NAME=ChatUI
PUBLIC_APP_ASSETS=chatui
PUBLIC_APP_COLOR=blue
PUBLIC_APP_DESCRIPTION="Making the community's best AI chat models available to everyone."
PUBLIC_APP_DATA_SHARING=
PUBLIC_APP_DISCLAIMER=
  • PUBLIC_APP_NAME The name used as a title throughout the app.
  • PUBLIC_APP_ASSETS Is used to find logos & favicons in static/$PUBLIC_APP_ASSETS, current options are chatui and huggingchat.
  • PUBLIC_APP_COLOR Can be any of the tailwind colors.
  • PUBLIC_APP_DATA_SHARING Can be set to 1 to add a toggle in the user settings that lets your users opt-in to data sharing with models creator.
  • PUBLIC_APP_DISCLAIMER If set to 1, we show a disclaimer about generated outputs on login.

Web Search config

You can enable the web search through an API by adding YDC_API_KEY (docs.you.com) or SERPER_API_KEY (serper.dev) or SERPAPI_KEY (serpapi.com) or SERPSTACK_API_KEY (serpstack.com) or SEARCHAPI_KEY (searchapi.io) to your .env.local.

You can also simply enable the local google websearch by setting USE_LOCAL_WEBSEARCH=true in your .env.local or specify a SearXNG instance by adding the query URL to SEARXNG_QUERY_URL.

You can enable javascript when parsing webpages to improve compatibility with WEBSEARCH_JAVASCRIPT=true at the cost of increased CPU usage. You'll want at least 4 cores when enabling.

Custom models

You can customize the parameters passed to the model or even use a new model by updating the MODELS variable in your .env.local. The default one can be found in .env and looks like this :

MODELS=`[
  {
    "name": "mistralai/Mistral-7B-Instruct-v0.2",
    "displayName": "mistralai/Mistral-7B-Instruct-v0.2",
    "description": "Mistral 7B is a new Apache 2.0 model, released by Mistral AI that outperforms Llama2 13B in benchmarks.",
    "websiteUrl": "https://mistral.ai/news/announcing-mistral-7b/",
    "preprompt": "",
    "chatPromptTemplate" : "<s>{{#each messages}}{{#ifUser}}[INST] {{#if @first}}{{#if @root.preprompt}}{{@root.preprompt}}\n{{/if}}{{/if}}{{content}} [/INST]{{/ifUser}}{{#ifAssistant}}{{content}}</s>{{/ifAssistant}}{{/each}}",
    "parameters": {
      "temperature": 0.3,
      "top_p": 0.95,
      "repetition_penalty": 1.2,
      "top_k": 50,
      "truncate": 3072,
      "max_new_tokens": 1024,
      "stop": ["</s>"]
    },
    "promptExamples": [
      {
        "title": "Write an email from bullet list",
        "prompt": "As a restaurant owner, write a professional email to the supplier to get these products every week: \n\n- Wine (x10)\n- Eggs (x24)\n- Bread (x12)"
      }, {
        "title": "Code a snake game",
        "prompt": "Code a basic snake game in python, give explanations for each step."
      }, {
        "title": "Assist in a task",
        "prompt": "How do I make a delicious lemon cheesecake?"
      }
    ]
  }
]`

You can change things like the parameters, or customize the preprompt to better suit your needs. You can also add more models by adding more objects to the array, with different preprompts for example.

chatPromptTemplate

When querying the model for a chat response, the chatPromptTemplate template is used. messages is an array of chat messages, it has the format [{ content: string }, ...]. To identify if a message is a user message or an assistant message the ifUser and ifAssistant block helpers can be used.

The following is the default chatPromptTemplate, although newlines and indentiation have been added for readability. You can find the prompts used in production for HuggingChat here.

{{preprompt}}
{{#each messages}}
  {{#ifUser}}{{@root.userMessageToken}}{{content}}{{@root.userMessageEndToken}}{{/ifUser}}
  {{#ifAssistant}}{{@root.assistantMessageToken}}{{content}}{{@root.assistantMessageEndToken}}{{/ifAssistant}}
{{/each}}
{{assistantMessageToken}}

Multi modal model

We currently support IDEFICS (hosted on TGI), OpenAI and Claude 3 as multimodal models. You can enable it by setting multimodal: true in your MODELS configuration. For IDEFICS, you must have a PRO HF Api token. For OpenAI, see the OpenAI section. For Anthropic, see the Anthropic section.

    {
      "name": "HuggingFaceM4/idefics-80b-instruct",
      "multimodal" : true,
      "description": "IDEFICS is the new multimodal model by Hugging Face.",
      "preprompt": "",
      "chatPromptTemplate" : "{{#each messages}}{{#ifUser}}User: {{content}}{{/ifUser}}<end_of_utterance>\nAssistant: {{#ifAssistant}}{{content}}\n{{/ifAssistant}}{{/each}}",
      "parameters": {
        "temperature": 0.1,
        "top_p": 0.95,
        "repetition_penalty": 1.2,
        "top_k": 12,
        "truncate": 1000,
        "max_new_tokens": 1024,
        "stop": ["<end_of_utterance>", "User:", "\nUser:"]
      }
    }

Running your own models using a custom endpoint

If you want to, instead of hitting models on the Hugging Face Inference API, you can run your own models locally.

A good option is to hit a text-generation-inference endpoint. This is what is done in the official Chat UI Spaces Docker template for instance: both this app and a text-generation-inference server run inside the same container.

To do this, you can add your own endpoints to the MODELS variable in .env.local, by adding an "endpoints" key for each model in MODELS.

{
// rest of the model config here
"endpoints": [{
  "type" : "tgi",
  "url": "https://HOST:PORT",
  }]
}

If endpoints are left unspecified, ChatUI will look for the model on the hosted Hugging Face inference API using the model name.

OpenAI API compatible models

Chat UI can be used with any API server that supports OpenAI API compatibility, for example text-generation-webui, LocalAI, FastChat, llama-cpp-python, and ialacol and vllm.

The following example config makes Chat UI works with text-generation-webui, the endpoint.baseUrl is the url of the OpenAI API compatible server, this overrides the baseUrl to be used by OpenAI instance. The endpoint.completion determine which endpoint to be used, default is chat_completions which uses v1/chat/completions, change to endpoint.completion to completions to use the v1/completions endpoint.

Parameters not supported by OpenAI (e.g., top_k, repetition_penalty, etc.) must be set in the extraBody of endpoints. Be aware that setting them in parameters will cause them to be omitted.

MODELS=`[
  {
    "name": "text-generation-webui",
    "id": "text-generation-webui",
    "parameters": {
      "temperature": 0.9,
      "top_p": 0.95,
      "max_new_tokens": 1024,
      "stop": []
    },
    "endpoints": [{
      "type" : "openai",
      "baseURL": "http://localhost:8000/v1",
      "extraBody": {
        "repetition_penalty": 1.2,
        "top_k": 50,
        "truncate": 1000
      }
    }]
  }
]`

The openai type includes official OpenAI models. You can add, for example, GPT4/GPT3.5 as a "openai" model:

OPENAI_API_KEY=#your openai api key here
MODELS=`[{
      "name": "gpt-4",
      "displayName": "GPT 4",
      "endpoints" : [{
        "type": "openai"
      }]
},
      {
      "name": "gpt-3.5-turbo",
      "displayName": "GPT 3.5 Turbo",
      "endpoints" : [{
        "type": "openai"
      }]
}]`

You may also consume any model provider that provides compatible OpenAI API endpoint. For example, you may self-host Portkey gateway and experiment with Claude or GPTs offered by Azure OpenAI. Example for Claude from Anthropic:

MODELS=`[{
  "name": "claude-2.1",
  "displayName": "Claude 2.1",
  "description": "Anthropic has been founded by former OpenAI researchers...",
  "parameters": {
      "temperature": 0.5,
      "max_new_tokens": 4096,
  },
  "endpoints": [
      {
          "type": "openai",
          "baseURL": "https://gateway.example.com/v1",
          "defaultHeaders": {
              "x-portkey-config": '{"provider":"anthropic","api_key":"sk-ant-abc...xyz"}'
          }
      }
  ]
}]`

Example for GPT 4 deployed on Azure OpenAI:

MODELS=`[{
  "id": "gpt-4-1106-preview",
  "name": "gpt-4-1106-preview",
  "displayName": "gpt-4-1106-preview",
  "parameters": {
      "temperature": 0.5,
      "max_new_tokens": 4096,
  },
  "endpoints": [
      {
          "type": "openai",
          "baseURL": "https://{resource-name}.openai.azure.com/openai/deployments/{deployment-id}",
          "defaultHeaders": {
              "api-key": "{api-key}"
          },
          "defaultQuery": {
              "api-version": "2023-05-15"
          }
      }
  ]
}]`

Or try Mistral from Deepinfra:

Note, apiKey can either be set custom per endpoint, or globally using OPENAI_API_KEY variable.

MODELS=`[{
  "name": "mistral-7b",
  "displayName": "Mistral 7B",
  "description": "A 7B dense Transformer, fast-deployed and easily customisable. Small, yet powerful for a variety of use cases. Supports English and code, and a 8k context window.",
  "parameters": {
      "temperature": 0.5,
      "max_new_tokens": 4096,
  },
  "endpoints": [
      {
          "type": "openai",
          "baseURL": "https://api.deepinfra.com/v1/openai",
          "apiKey": "abc...xyz"
      }
  ]
}]`
Llama.cpp API server

chat-ui also supports the llama.cpp API server directly without the need for an adapter. You can do this using the llamacpp endpoint type.

If you want to run Chat UI with llama.cpp, you can do the following, using microsoft/Phi-3-mini-4k-instruct-gguf as an example model:

# install llama.cpp
brew install llama.cpp
# start llama.cpp server
llama-server --hf-repo microsoft/Phi-3-mini-4k-instruct-gguf --hf-file Phi-3-mini-4k-instruct-q4.gguf -c 4096

MODELS=`[
  {
      "name": "Local Zephyr",
      "chatPromptTemplate": "<|system|>\n{{preprompt}}</s>\n{{#each messages}}{{#ifUser}}<|user|>\n{{content}}</s>\n<|assistant|>\n{{/ifUser}}{{#ifAssistant}}{{content}}</s>\n{{/ifAssistant}}{{/each}}",
      "parameters": {
        "temperature": 0.1,
        "top_p": 0.95,
        "repetition_penalty": 1.2,
        "top_k": 50,
        "truncate": 1000,
        "max_new_tokens": 2048,
        "stop": ["</s>"]
      },
      "endpoints": [
        {
         "url": "http://127.0.0.1:8080",
         "type": "llamacpp"
        }
      ]
  }
]`

Start chat-ui with npm run dev and you should be able to chat with Zephyr locally.

Ollama

We also support the Ollama inference server. Spin up a model with

ollama run mistral

Then specify the endpoints like so:

MODELS=`[
  {
      "name": "Ollama Mistral",
      "chatPromptTemplate": "<s>{{#each messages}}{{#ifUser}}[INST] {{#if @first}}{{#if @root.preprompt}}{{@root.preprompt}}\n{{/if}}{{/if}} {{content}} [/INST]{{/ifUser}}{{#ifAssistant}}{{content}}</s> {{/ifAssistant}}{{/each}}",
      "parameters": {
        "temperature": 0.1,
        "top_p": 0.95,
        "repetition_penalty": 1.2,
        "top_k": 50,
        "truncate": 3072,
        "max_new_tokens": 1024,
        "stop": ["</s>"]
      },
      "endpoints": [
        {
         "type": "ollama",
         "url" : "http://127.0.0.1:11434",
         "ollamaName" : "mistral"
        }
      ]
  }
]`

Anthropic

We also support Anthropic models (including multimodal ones via multmodal: true) through the official SDK. You may provide your API key via the ANTHROPIC_API_KEY env variable, or alternatively, through the endpoints.apiKey as per the following example.

MODELS=`[
  {
      "name": "claude-3-haiku-20240307",
      "displayName": "Claude 3 Haiku",
      "description": "Fastest and most compact model for near-instant responsiveness",
      "multimodal": true,
      "parameters": {
        "max_new_tokens": 4096,
      },
      "endpoints": [
        {
          "type": "anthropic",
          // optionals
          "apiKey": "sk-ant-...",
          "baseURL": "https://api.anthropic.com",
          "defaultHeaders": {},
          "defaultQuery": {}
        }
      ]
  },
  {
      "name": "claude-3-sonnet-20240229",
      "displayName": "Claude 3 Sonnet",
      "description": "Ideal balance of intelligence and speed",
      "multimodal": true,
      "parameters": {
        "max_new_tokens": 4096,
      },
      "endpoints": [
        {
          "type": "anthropic",
          // optionals
          "apiKey": "sk-ant-...",
          "baseURL": "https://api.anthropic.com",
          "defaultHeaders": {},
          "defaultQuery": {}
        }
      ]
  },
  {
      "name": "claude-3-opus-20240229",
      "displayName": "Claude 3 Opus",
      "description": "Most powerful model for highly complex tasks",
      "multimodal": true,
      "parameters": {
         "max_new_tokens": 4096
      },
      "endpoints": [
        {
          "type": "anthropic",
          // optionals
          "apiKey": "sk-ant-...",
          "baseURL": "https://api.anthropic.com",
          "defaultHeaders": {},
          "defaultQuery": {}
        }
      ]
  }
]`

We also support using Anthropic models running on Vertex AI. Authentication is done using Google Application Default Credentials. Project ID can be provided through the endpoints.projectId as per the following example:

MODELS=`[
  {
      "name": "claude-3-sonnet@20240229",
      "displayName": "Claude 3 Sonnet",
      "description": "Ideal balance of intelligence and speed",
      "multimodal": true,
      "parameters": {
        "max_new_tokens": 4096,
      },
      "endpoints": [
        {
          "type": "anthropic-vertex",
          "region": "us-central1",
          "projectId": "gcp-project-id",
          // optionals
          "defaultHeaders": {},
          "defaultQuery": {}
        }
      ]
  },
  {
      "name": "claude-3-haiku@20240307",
      "displayName": "Claude 3 Haiku",
      "description": "Fastest, most compact model for near-instant responsiveness",
      "multimodal": true,
      "parameters": {
         "max_new_tokens": 4096
      },
      "endpoints": [
        {
          "type": "anthropic-vertex",
          "region": "us-central1",
          "projectId": "gcp-project-id",
          // optionals
          "defaultHeaders": {},
          "defaultQuery": {}
        }
      ]
  }
]`

Amazon

You can also specify your Amazon SageMaker instance as an endpoint for chat-ui. The config goes like this:

"endpoints": [
    {
      "type" : "aws",
      "service" : "sagemaker"
      "url": "",
      "accessKey": "",
      "secretKey" : "",
      "sessionToken": "",
      "region": "",

      "weight": 1
    }
]

You can also set "service" : "lambda" to use a lambda instance.

You can get the accessKey and secretKey from your AWS user, under programmatic access.

Cloudflare Workers AI

You can also use Cloudflare Workers AI to run your own models with serverless inference.

You will need to have a Cloudflare account, then get your account ID as well as your API token for Workers AI.

You can either specify them directly in your .env.local using the CLOUDFLARE_ACCOUNT_ID and CLOUDFLARE_API_TOKEN variables, or you can set them directly in the endpoint config.

You can find the list of models available on Cloudflare here.

  {
  "name" : "nousresearch/hermes-2-pro-mistral-7b",
  "tokenizer": "nousresearch/hermes-2-pro-mistral-7b",
  "parameters": {
    "stop": ["<|im_end|>"]
  },
  "endpoints" : [
    {
      "type" : "cloudflare"
      <!-- optionally specify these
      "accountId": "your-account-id",
      "authToken": "your-api-token"
      -->
    }
  ]
}

Cohere

You can also use Cohere to run their models directly from chat-ui. You will need to have a Cohere account, then get your API token. You can either specify it directly in your .env.local using the COHERE_API_TOKEN variable, or you can set it in the endpoint config.

Here is an example of a Cohere model config. You can set which model you want to use by setting the id field to the model name.

  {
    "name" : "CohereForAI/c4ai-command-r-v01",
    "id": "command-r",
    "description": "C4AI Command-R is a research release of a 35 billion parameter highly performant generative model",
    "endpoints": [
      {
        "type": "cohere",
        <!-- optionally specify these, or use COHERE_API_TOKEN
        "apiKey": "your-api-token"
        -->
      }
    ]
  }
Google Vertex models

Chat UI can connect to the google Vertex API endpoints (List of supported models).

To enable:

  1. Select or create a Google Cloud project.
  2. Enable billing for your project.
  3. Enable the Vertex AI API.
  4. Set up authentication with a service account so you can access the API from your local workstation.

The service account credentials file can be imported as an environmental variable:

    GOOGLE_APPLICATION_CREDENTIALS = clientid.json

Make sure your docker container has access to the file and the variable is correctly set. Afterwards Google Vertex endpoints can be configured as following:

MODELS=`[
//...
    {
       "name": "gemini-1.5-pro",
       "displayName": "Vertex Gemini Pro 1.5",
       "multimodal": true,
       "endpoints" : [{
          "type": "vertex",
          "project": "abc-xyz",
          "location": "europe-west3",
          "extraBody": {
          "model_version": "gemini-1.5-pro-preview-0409",
          },

          // Optional
          "safetyThreshold": "BLOCK_MEDIUM_AND_ABOVE",
          "apiEndpoint": "", // alternative api endpoint url,
          "tools": [{
            "googleSearchRetrieval": {
              "disableAttribution": true
            }
          }],
          "multimodal": {
            "image": {
              "supportedMimeTypes": ["image/png", "image/jpeg", "image/webp"],
              "preferredMimeType": "image/png",
              "maxSizeInMB": 5,
              "maxWidth": 2000,
              "maxHeight": 1000,
            }
          }
       }]
     },
]`
LangServe

LangChain applications that are deployed using LangServe can be called with the following config:

MODELS=`[
//...
    {
       "name": "summarization-chain", //model-name
       "endpoints" : [{
         "type": "langserve",
         "url" : "http://127.0.0.1:8100",
       }]
     },
]`

Custom endpoint authorization

Basic and Bearer

Custom endpoints may require authorization, depending on how you configure them. Authentication will usually be set either with Basic or Bearer.

For Basic we will need to generate a base64 encoding of the username and password.

echo -n "USER:PASS" | base64

VVNFUjpQQVNT

For Bearer you can use a token, which can be grabbed from here.

You can then add the generated information and the authorization parameter to your .env.local.

"endpoints": [
  {
    "url": "https://HOST:PORT",
    "authorization": "Basic VVNFUjpQQVNT",
  }
]

Please note that if HF_TOKEN is also set or not empty, it will take precedence.

Models hosted on multiple custom endpoints

If the model being hosted will be available on multiple servers/instances add the weight parameter to your .env.local. The weight will be used to determine the probability of requesting a particular endpoint.

"endpoints": [
  {
    "url": "https://HOST:PORT",
    "weight": 1
  },
  {
    "url": "https://HOST:PORT",
    "weight": 2
  }
  ...
]

Client Certificate Authentication (mTLS)

Custom endpoints may require client certificate authentication, depending on how you configure them. To enable mTLS between Chat UI and your custom endpoint, you will need to set the USE_CLIENT_CERTIFICATE to true, and add the CERT_PATH and KEY_PATH parameters to your .env.local. These parameters should point to the location of the certificate and key files on your local machine. The certificate and key files should be in PEM format. The key file can be encrypted with a passphrase, in which case you will also need to add the CLIENT_KEY_PASSWORD parameter to your .env.local.

If you're using a certificate signed by a private CA, you will also need to add the CA_PATH parameter to your .env.local. This parameter should point to the location of the CA certificate file on your local machine.

If you're using a self-signed certificate, e.g. for testing or development purposes, you can set the REJECT_UNAUTHORIZED parameter to false in your .env.local. This will disable certificate validation, and allow Chat UI to connect to your custom endpoint.

Specific Embedding Model

A model can use any of the embedding models defined in .env.local, (currently used when web searching), by default it will use the first embedding model, but it can be changed with the field embeddingModel:

TEXT_EMBEDDING_MODELS = `[
  {
    "name": "Xenova/gte-small",
    "chunkCharLength": 512,
    "endpoints": [
      {"type": "transformersjs"}
    ]
  },
  {
    "name": "intfloat/e5-base-v2",
    "chunkCharLength": 768,
    "endpoints": [
      {"type": "tei", "url": "http://127.0.0.1:8080/", "authorization": "Basic VVNFUjpQQVNT"},
      {"type": "tei", "url": "http://127.0.0.1:8081/"}
    ]
  }
]`

MODELS=`[
  {
      "name": "Ollama Mistral",
      "chatPromptTemplate": "...",
      "embeddingModel": "intfloat/e5-base-v2"
      "parameters": {
        ...
      },
      "endpoints": [
        ...
      ]
  }
]`

Common issues

403：You don't have access to this conversation

Most likely you are running chat-ui over HTTP. The recommended option is to setup something like NGINX to handle HTTPS and proxy the requests to chat-ui. If you really need to run over HTTP you can add COOKIE_SECURE=false and COOKIE_SAMESITE=lax to your .env.local.

Make sure to set your PUBLIC_ORIGIN in your .env.local to the correct URL as well.

Deploying to a HF Space

Create a DOTENV_LOCAL secret to your HF space with the content of your .env.local, and they will be picked up automatically when you run.

Building

To create a production version of your app:

npm run build

You can preview the production build with npm run preview.

To deploy your app, you may need to install an adapter for your target environment.

Config changes for HuggingChat

The config file for HuggingChat is stored in the chart/env/prod.yaml file. It is the source of truth for the environment variables used for our CI/CD pipeline. For HuggingChat, as we need to customize the app color, as well as the base path, we build a custom docker image. You can find the workflow here.

[!TIP] If you want to make changes to the model config used in production for HuggingChat, you should do so against chart/env/prod.yaml.

Running a copy of HuggingChat locally

If you want to run an exact copy of HuggingChat locally, you will need to do the following first:

  1. Create an OAuth App on the hub with openid profile email permissions. Make sure to set the callback URL to something like http://localhost:5173/chat/login/callback which matches the right path for your local instance.
  2. Create a HF Token with your Hugging Face account. You will need a Pro account to be able to access some of the larger models available through HuggingChat.
  3. Create a free account with serper.dev (you will get 2500 free search queries)
  4. Run an instance of mongoDB, however you want. (Local or remote)

You can then create a new .env.SECRET_CONFIG file with the following content

MONGODB_URL=<link to your mongo DB from step 4>
HF_TOKEN=<your HF token from step 2>
OPENID_CONFIG=`{
  PROVIDER_URL: "https://huggingface.co",
  CLIENT_ID: "<your client ID from step 1>",
  CLIENT_SECRET: "<your client secret from step 1>",
}`
SERPER_API_KEY=<your serper API key from step 3>
MESSAGES_BEFORE_LOGIN=<can be any numerical value, or set to 0 to require login>

You can then run npm run updateLocalEnv in the root of chat-ui. This will create a .env.local file which combines the chart/env/prod.yaml and the .env.SECRET_CONFIG file. You can then run npm run dev to start your local instance of HuggingChat.

Populate database

[!WARNING] The MONGODB_URL used for this script will be fetched from .env.local. Make sure it's correct! The command runs directly on the database.

You can populate the database using faker data using the populate script:

npm run populate <flags here>

At least one flag must be specified, the following flags are available:

  • reset - resets the database
  • all - populates all tables
  • users - populates the users table
  • settings - populates the settings table for existing users
  • assistants - populates the assistants table for existing users
  • conversations - populates the conversations table for existing users

For example, you could use it like so:

npm run populate reset

to clear out the database. Then login in the app to create your user and run the following command:

npm run populate users settings assistants conversations

to populate the database with fake data, including fake conversations and assistants for your user.

Building the docker images locally

You can build the docker images locally using the following commands:

docker build -t chat-ui-db:latest --build-arg INCLUDE_DB=true .
docker build -t chat-ui:latest --build-arg INCLUDE_DB=false .
docker build -t huggingchat:latest --build-arg INCLUDE_DB=false --build-arg APP_BASE=/chat --build-arg PUBLIC_APP_COLOR=yellow .

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