EmbedJs

EmbedJs is a NodeJS framework that simplifies RAG application development by efficiently processing unstructured data. It segments data, creates relevant embeddings, and stores them in a vector database for quick retrieval.

Here's an example of how easy it is to get started -

const ragApplication = await new RAGApplicationBuilder()
    .addLoader(new SitemapLoader({ url: 'https://tesla-info.com/sitemap.xml' }))
    .addLoader(new WebLoader({ url: 'https://en.wikipedia.org/wiki/Tesla,_Inc.' }))
    .setVectorDb(new LanceDb({ path: '.db' }))
    .build();

That's it. Now you can ask questions -

console.log(await ragApplication.query('Tell me about the history of Tesla?'));

Features

Supports several large language models
Supports many vector databases including self-hosted and cloud variants.
Load different kinds of unstructured data. Comes built in with several loaders that makes this easy.
Supports several cache options that can greatly improve the performance of your RAG applications in production.
EmbedJs's simple and powerful API allows both quick launch and deep customizabilty.

Quick note

The author(s) are looking to add core maintainers for this opensource project. Reach out on Linkedin if you are interested. If you want to contribute in general - create issues on GitHub or send in PRs.

Getting started

Installation

You can install the library via NPM or Yarn

npm i @llm-tools/embedjs

Note: The library uses the newer ES6 modules and import syntax.

Usage

To configure a new EmbedJs application, you need to do three steps -

1. Pick an LLM
The library supports several LLMs. Activate one by allowing the instructions in the LLM section.

const ragApplication = await new RAGApplicationBuilder()
    .setModel(new HuggingFace({ modelName: 'mistralai/Mixtral-8x7B-v0.1' }))
    ...

2. Pick a Vector database
The library supports several vector databases. Enable one by allowing the instructions in the Vector Databases section.

    .setVectorDb(new PineconeDb({ projectName: 'test', namespace: 'dev' }))

3. Load some data
The library supports several kinds of loaders. You can use zero, one or many kinds of loaders together to import custom knowledge. Read the loaders section to learn more about the different supported loaders.

    .addLoader(new YoutubeSearchLoader({ searchString: 'Tesla cars' }))
    .addLoader(new SitemapLoader({ url: 'https://tesla-info.com/sitemap.xml' }))
    .build();

That's it! Now that you have your instance of RAGApplication, you can use it to query against the loaded data sets, like so -

await ragApplication.query('What is Tesla?');

Temperature

The temperature is a number between 0 and 1. It governs the randomness and creativity of the LLM responses. Higher values like 0.8 will make the output more random, while lower values like 0.2 will make it more focused and deterministic. You can alter it by -

await new RAGApplicationBuilder()
.setTemperature(0.1)

NOTE: The default value is 0.1, which makes the GPT responses very precise.

Search results count

This is the number of documents to aim for when retrieving results from the vector database. A high number of results might mean there is more non-relevant data in the context. A low number might mean none of the relevant documents are retrieved. You need to set the number that works best for you. The parameter can be altered by -

await new RAGApplicationBuilder()
.setSearchResultCount(10)

NOTE: The default value is 7.

It is important to note that the library does not simply dump all contextual document chunks into the prompt. It sends them to the model marking them as context documents. The number of documents still counts toward the token limit.

When the number of documents fetched leads to a request above the token limit, the library uses the following strategy -

It runs a preprocessing step to select relevant sections from each document until the total number of tokens is less than the maximum number of tokens allowed by the model. It then uses the transformed documents as context to answer the question.

Customize the prompt

LLM models need some care. The models are notorious for inventing responses when they don't know the answer. Keeping this in mind, the library auto adds a wrapper to all user queries. The default prompt is -

Use all the provided context to answer the query at the end. Answer in full. If you don't know the answer, just say that you don't know, don't try to make up an answer. Query: {0}

The placeholder {0} is replaced with the input query. In some cases, you may want to customize this prompt. This can be done with ease by -

await new RAGApplicationBuilder()
.QueryTemplate('My own query template')

Get context (dry run)

During development, you may want to test the performance and quality of the Loaders you have enabled without making any LLM calls. You can do this by using the getContext method -

await ragApplication.getContext('What is Steve Jobs?')

Get count of embedded chunks

You can fetch the count of embeddedings stored in your vector database at any time by calling the getEmbeddingsCount method -

await ragApplication.getEmbeddingsCount()

Loaders supported

Loaders take a specific format, process the input and create chunks of the data. Currently, the library supports the following formats -

PDF file

To add a pdf file, use PdfLoader. You can add a local file -

.addLoader(new PdfLoader({ filePath: path.resolve('paxos-simple.pdf') }))

Or, you can add a remote file -

.addLoader(new PdfLoader({ url: 'https://lamport.azurewebsites.net/pubs/paxos-simple.pdf' }))

By default, the PdfLoader uses the hash of the filePath or the Url as the loader cache key. In some cases, like when using dynamic files with the same name, you can pass in your own custom uniqueId like so -

.addLoader(new PdfLoader({ url: '<URL>', , uniqueId: 'MY_UNIQUE_ID' }))

Note: Currently there is no support for PDF forms and password protected documents

Web page

To add a web page, use WebLoader.

.addLoader(new WebLoader({ url: 'https://en.wikipedia.org/wiki/Formula_One' }))

Sitemap

To add a XML sitemap, use SitemapLoader.

.addLoader(new SitemapLoader({ url: '...' }))

This will load all URLs in a sitemap via the WebLoader.

Text

To supply your own text, use TextLoader.

.addLoader(new TextLoader({ text: 'The best company name for a company making colorful socks is MrSocks' }))

Note: Feel free to add your custom text without worrying about duplication. The library will chuck, cache and update the vector databases.

Youtube video

To add any youtube video to your app, use YoutubeLoader.

Note: You will need to import it dynamically and have the required pacakges installed.

.addLoader(new YoutubeLoader({ videoIdOrUrl: 'w2KbwC-s7pY' }))

Youtube channel

To add all videos in a youtube channel, use YoutubeChannelLoader.

Note: You will need to import it dynamically and have the required pacakges installed.

.addLoader(new YoutubeChannelLoader({ channelId: '...' }))

Youtube search

To do a general youtube search and add the popular search results, use YoutubeSearchLoader.

Note: You will need to import it dynamically and have the required pacakges installed.

.addLoader(new YoutubeSearchLoader({ searchString: '...' }))

Confluence

To add a confluence space, use ConfluenceLoader.

Note: You will need to import it dynamically and have the required pacakges installed.

.addLoader(new ConfluenceLoader({ spaceNames: ['...'] }))

You also need to set the following environment variables -

CONFLUENCE_BASE_URL=<your space base url>
CONFLUENCE_USER_NAME=<your email id or username>
CONFLUENCE_API_TOKEN=<your personal or bot access token>

Note: The confluence space name is the value you see in the url in the space overview page /wiki/spaces/{{ space name }}/overview.

Add a custom loader

You can pass along a custom loader to the addLoader method by extending and implementing the abstract class BaseLoader. Here's how that would look like -

class CustomLoader extends BaseLoader<{ customChunkMetadata: string }> {
    constructor() {
        super('uniqueId');
    }

    async *getChunks() {
        throw new Error('Method not implemented.');
    }
}

We really encourage you send in a PR to this library if you are implementing a common loader pattern, so the community can benefit from it.

More loaders coming soon

If you want to add any other format, please create an issue and we will add it to the list of supported formats. All PRs are welcome.

LLMs

It's relatively easy to switch between different LLMs using the library. We support the following LLMs today -

OpenAI

To use the OpenAI LLM models, you need a API key from OpenAI. You can alternatively use Azure OpenAI to run these models. Read the Azure OpenAI section below to learn more about this. In this section, we will cover how to use OpenAI provided LLMs.

The first step is to obtain an API Key from OpenAI. You can do this by visiting their API Portal. Once you obtain a key, set it as an environment variable, like so -

OPENAI_API_KEY="<Your key>"

Once this is done, it is relatively easy to run OpenAI LLMs. All you need is to indicate the model type you want to run.

For GPT 3.5 Turbo

const ragApplication = await new RAGApplicationBuilder()
.setModel(SIMPLE_MODELS.OPENAI_GPT3_TURBO)

For GPT 4

const ragApplication = await new RAGApplicationBuilder()
.setModel(SIMPLE_MODELS.OPENAI_GPT4)

To use a custom model name

const ragApplication = await new RAGApplicationBuilder()
.setModel(new OpenAi({ modelName: 'gpt-4' }))

Note: GPT 3.5 Turbo is used as the default model if you do not specifiy one.

Mistral

To use Mirstal's models, you will need to get an API Key from Mistral. You can do this from their console. Once you have obtained a key, set Mistral as your LLM of choice -

const ragApplication = await new RAGApplicationBuilder()
.setModel(new Mistral({ accessToken: "<YOUR_MISTRAL_TOKEN_HERE>" }))

By default, the mistral-medium model from Mistral is used. If you want to use a different Mistral model, you can specify it via the optional parameter to the Mistral constructor, like so -

const ragApplication = await new RAGApplicationBuilder()
.setModel(new Mistral({ accessToken: "<YOUR_MISTRAL_TOKEN_HERE>", modelName: "..." }))

Note: If you want to run Mistral open source for free, you can do so using the HuggingFace platform (read below). Just make sure to set the modelName to mistralai/Mistral-7B-v0.1 or the version you want to run.

Hugging Face

Hugging face needs no introduction. They host a variety of open source LLMs and you can use most of them for free. To run hugging face inference based LLMs with this library, you will need a free hugging face token.

You can get an API Token by signing up for hugging face and generate a token from this page. Once you get the token, set it to the environment like so -

HUGGINGFACEHUB_API_KEY="<Your hf key>"

That's all, now you can use any hugging face model. To do this set HuggingFace as your model processor of choice -

const ragApplication = await new RAGApplicationBuilder()
.setModel(new HuggingFace({ modelName: "..." })))

Note: Not all hugging face models are fully free to consume via their API. Since running these models takes a lot of resources, Hugging Face charges a fee for a few of the larger ones. This is the case with Meta's meta-llama/Llama-2-7b-hf, for example.

To use these 'not-free' models via HuggingFace, you need to subscribe to their Pro plan or create a custom inference endpoint. It is possible to self host these models for free and run them locally via Ollama - support for which is coming soon.

Azure OpenAI

In order to be able to use an OpenAI model on Azure, it first needs to be deployed. Please refer to Azure OpenAI documentation on how to deploy a model on Azure. To run this library, you will need to deploy two models -

text-embedding-ada
GPT-3.5-turbo (or the 4 series)

Once these models are deployed, using Azure OpenAI instead of the regular OpenAI is easy to do. Just follow these steps -

Remove the OPENAI_API_KEY environment variable if you have set it already.
Set the following environment variables -

# Set this to `azure`
OPENAI_API_TYPE=azure
# The API version you want to use
AZURE_OPENAI_API_VERSION=2023-05-15
# The base URL for your Azure OpenAI resource.  You can find this in the Azure portal under your Azure OpenAI resource.
export AZURE_OPENAI_BASE_PATH=https://your-resource-name.openai.azure.com/openai/deployments
# The API key1 or key2 for your Azure OpenAI resource
export AZURE_OPENAI_API_KEY=<Your Azure OpenAI API key>
# The deployment name you used for your embedding model
AZURE_OPENAI_API_EMBEDDINGS_DEPLOYMENT_NAME=text-embedding-ada-002
# The deployment name you used for your llm
AZURE_OPENAI_API_DEPLOYMENT_NAME=gpt-35-turbo

You can now run the Azure OpenAI LLMs using the OpenAi model detailed above.

Use custom LLM model

You can use a custom LLM model by implementing the BaseModel interface. Here's how that would look like -

class MyOwnLLMImplementation implements BaseModel {
    override async init(): Promise<void> {} //optional to override

    protected abstract runQuery(
        system: string, //the system prompt
        userQuery: string, //the current user query
        supportingContext: Chunk[], //all supporting documents
        pastConversations: ConversationHistory[], //the chat history so far
    ): Promise<string> {
        throw new Error("Method not implemented.");
    }
}

Once done, you can pass this class to the setModel method like shown in the examples above. That said, we really encourage you send in a PR to this library if you are implementing a famous or common LLM, so the community can benefit from it.

More LLMs coming soon

If you want us to add support for a specific LLM, please create an issue and we will prioritize it. All PRs are welcome.

Currently, we next plan to add support for Ollama.

Embedding models

Embedding models are LLMs that convert a string into vector better suited for processing. In most cases, the default text-embedding-ada-002 model from OpenAI is going to be good enough. If you want to use this model, you do not have to do anything.

However in some advanced cases, you may want to change this; after all, different embedding models perform differently under different curcumstances. The library allows you to do this using the method setEmbeddingModel while building the RAGApplication.

The library supports the following embedding models -

OpenAI v3 Small

The text-embedding-3-small is a new standard embedding model released by OpenAI in Jan, 2024. It is the default used by the libary. This model is cheaper and better than their older Ada model. This model returns vectors with dimension 1536.

You do not have to do anything to enable it.

OpenAI v3 Large

The text-embedding-3-large is also a new standard embedding model released by OpenAI in Jan, 2024. This model is the best embedding model provided by OpenAI as of now but is also the most expensive. This model returns vectors with dimension 3072.

To set it as your model of choice -

Set OpenAi3LargeEmbeddings as your embedding model on RAGApplicationBuilder

await new RAGApplicationBuilder()
.setEmbeddingModel(new OpenAi3LargeEmbeddings())

Ada

The text-embedding-ada-002 is a well known model from OpenAI. You can read more about it here. This model returns vectors with dimension 1536.

To set it as your model of choice -

Set AdaEmbeddings as your embedding model on RAGApplicationBuilder

await new RAGApplicationBuilder()
.setEmbeddingModel(new AdaEmbeddings())

Cohere

The library supports usage of Cohere-AI embed-english-v2.0 embedding model out of the box. This model returns vectors with dimension 4096.

Here's what you have to do to enable it -

Sign up for an account with Cohere-AI if you have not done so already. Once done, go to the API Keys section and copy an API_KEY.
Load the key you just obtained in the environment variable COHERE_API_KEY

COHERE_API_KEY="<YOUR_KEY>"

Set CohereEmbeddings as your embedding model on RAGApplicationBuilder

await new RAGApplicationBuilder()
.setEmbeddingModel(new CohereEmbeddings())

Use custom embedding model

You can use your own custom embedding model by implementing the BaseEmbeddings interface. Here's how that would look like -

class MyOwnEmbeddingImplementation implements BaseEmbeddings {
    embedDocuments(texts: string[]): Promise<number[][]> {
        throw new Error("Method not implemented.");
    }

    embedQuery(text: string): Promise<number[]> {
        throw new Error("Method not implemented.");
    }

    getDimensions(): number {
        throw new Error("Method not implemented.");
    }
}

Once done, you can pass this class to the setEmbeddingModel method like shown in the Cohere example above. That said, we really encourage you send in a PR to this library if you are implementing a famous or common embedding provider, so the community can benefit from it.

More embedding models coming soon

If you want us to add support for a specific embedding model, please create an issue and we will prioritize it. All PRs are welcome.

Vector databases supported

The library allows you to save your processed and unique embeddings with the vector databases of your choice. Here are the supported databases right now -

Pinecone

You can enable Pinecone storage by following these steps -

Create an account with Pinecone if you don't have one already. There is a good free tier.
Install pinecone package in your project

npm install @pinecone-database/pinecone

Set the pinecone environment variable PINECONE_API_KEY. This can be obtained from the API Keys section on the Pinecone dashboard.

PINECONE_API_KEY=<your api key>

Set the Pinecone database as your choice of vectorDb

.setVectorDb(new PineconeDb({
    projectName: 'test',
    namespace: 'dev',
    indexSpec: {
        pod: {
            podType: 'p1.x1',
            environment: 'us-east1-gcp',
        },
    },
}))

Note: Pinecone supports serverless and pod based index deployments. You can control how you want your index created using the indexSpec attribute. This is mandatory to be provided but comes with full type specification. Read more about configuring this here.

MongoDB Atlas

MongoDB Atlas is a fully managed cloud database service built by the same team behind MongoDB. It offers high availability, scalability, and security for your database needs. Follow these steps to use MongoDB Atlas as your database for vector storage:

Description

MongoDB Atlas provides a scalable and fully managed database solution for storing vectors and performing vector-based operations. With MongoDB Atlas, you can easily create, manage, and scale your database cluster to meet the demands of your application. Leveraging MongoDB's flexible document model, you can store vectors alongside other data types, making it a versatile solution for various use cases.

Prerequisites

To use MongoDB Atlas as your vector database, you'll need:

A MongoDB Atlas account. You can sign up here.
A MongoDB Atlas cluster, preferably an M10 or higher deployment, to ensure optimal performance and features.

Instructions

Set up MongoDB Atlas Cluster:
- Log in to your MongoDB Atlas account.
- Create a new project or select an existing one.
- Navigate to the Clusters section and click on "Build a New Cluster".
- Configure your cluster settings, including cloud provider, region, cluster tier (M10 or higher is recommended), and additional settings as needed.
- Once your cluster is created, wait for it to be deployed and become available.
Connect to your Cluster:
- After your cluster is deployed, create a new database and collection.
- Next click on "Connect" to get your connection string.
- Whitelist your IP address if necessary to allow connections to your cluster.
- Create a username and account to connect to your cluster
Install MongoDB Node.js Driver:
- In your Node.js project, install the MongoDB Node.js driver:
```
npm install mongodb
```

Configure MongoDB Atlas as Vector Database:

Add the following to your .env

MONGODB_URI=mongodb+srv://username:[email protected]/database_name
DB_NAME=my_database
COLLECTION_NAME=my_collection

Chroma

Chroma is an open source vector database. It's designed to be Python first and to connect to it from NodeJS, you will need to run Chroma in a container following the steps listed here. Once done, follow these steps to use Chroma as your vector database -

Install Chroma package in your project

npm install chromadb

Set Chroma database as your choice of vectorDb

.setVectorDb(new ChromaDb({ url: 'http://localhost:8000' }))

Note: This is the default url and port if you run the Chroma docker container using the command docker-compose up -d --build.

A warning -

In our testing, chroma performed the poorest in being able to retrieve relevant documents among the supported vector databases.

HNSWLib

HNSWLib is an in-memory vectorstore. It is great for beginners to get started with since you do not need access to the file system or a cloud service. Follow these steps to use HNSWLib as your vector database -

Install HNSWLib package in your project

npm install hnswlib-node

Set HNSWLib database as your choice of vectorDb

.setVectorDb(new HNSWDb())

Note: This is a purely in-memory vector store. All values are lost when application is restarted.

Weaviate

Weaviate is an open source vector store. You can deploy it locally on docker or use their managed cloud offering. Follow these steps to use Weaviate as your vector database -

Install Weaviate package in your project

npm install weaviate-ts-client

Set Weaviate database as your choice of vectorDb

.setVectorDb(new WeaviateDb({ host: '...', apiKey: '...', className: '...' }))

Bring your own database

You can pass along your vector database to the setVectorDb method by implementing the interface BaseDb. Here's how that would look like -

class MyOwnDb implements BaseDb {
    async init({ dimensions }: { dimensions: number }): Promise<void> {
        throw new Error('Method not implemented.');
    }

    async insertChunks(chunks: EmbeddedChunk[]): Promise<number> {
        throw new Error('Method not implemented.');
    }

    async similaritySearch(query: number[], k: number): Promise<Chunk[]> {
        throw new Error('Method not implemented.');
    }

    async getVectorCount(): Promise<number> {
        throw new Error('Method not implemented.');
    }

    async deleteKeys(keys: string[]): Promise<void> {
        throw new Error('Method not implemented.');
    }

    async reset(): Promise<void> {
        throw new Error('Method not implemented.');
    }
}

We really encourage you send in a PR to this library if you are implementing a famous or common database, so the community can benefit from it.

More databases coming soon

If you want to add support for any other vector database, please create an issue and we will add it to the list of supported databases. All PRs are welcome.

Caches

Caches serve to reduce re-processing embeddings, loaders and queries. There is no need to load, chunk and store a large PDF File or web page on every run. Caching smartly is built in and can be enabled out of the box simply by setting a cache processor using the method setCache while building the RAGApplication.

The library supports the following caches -

LMDB

You can use LMDB to cache values locally on disk.

Install LMDB package in your project

npm install lmdb

Set LmdbCache as your cache provider on RAGApplicationBuilder

await new RAGApplicationBuilder()
.setCache(new LmdbCache({ path: path.resolve('./cache') }))

Note: The path property will be used by the LMDB driver to create a folder housing the LMDB database files.

Here's the updated README section for using the MongoDB cache:

MongoDB

You can utilize MongoDB as a cache provider to store values in a MongoDB database.

Install MongoDB package in your project

npm install mongodb

Set MongoCache as your cache provider on RAGApplicationBuilder

import { MongoClient } from 'mongodb';

await new RAGApplicationBuilder()
    .setCache(new MongoCache({
    uri: MONGODB_URI,
    dbName: DB_NAME,
    collectionName: CACHE_COLLECTION_NAME
})

Note: You can use the same Mongo URI and Database as for your vectors, just with a different collection name.

InMemory

You can use a simple in-memory cache to store values during testing.

Set MemoryCache as your cache provider on RAGApplicationBuilder

await new RAGApplicationBuilder()
.setCache(new MemoryCache())

Note: Although this cache can remove duplicate loaders and chunks, its store does not persist between process restarts. You should only be using it for testing.

Redis

You can use redis as a cache to store values during testing.

Set RedisCache as your cache provider on RAGApplicationBuilder

await new RAGApplicationBuilder()
.setCache(new RedisCache({ ... }))

Note: The library internally uses IORedis to work with redis. RedisCache constructor supports all IORedis constructor parameters. Check IORedis documentation for more detials.

Bring your own cache

You can pass along your own cache provider to the setCache method by implementing the interface BaseCache. Here's how that would look like -

class MyOwnCache implements BaseCache {
    async init(): Promise<void> {
        throw new Error("Method not implemented.");
    }

    async addLoader(loaderId: string, chunkCount: number ): Promise<void> {
        throw new Error("Method not implemented.");
    }

    async getLoader(loaderId: string): Promise<{ chunkCount: number }> {
        throw new Error("Method not implemented.");
    }

    async hasLoader(loaderId: string): Promise<boolean> {
        throw new Error("Method not implemented.");
    }
}

We really encourage you send in a PR to this library if you are implementing a famous or common cache provider, so the community can benefit from it.

More caches coming soon

If you want to add support for any other cache providers, please create an issue and we will add it to the list of supported caches. All PRs are welcome.

Langsmith Integration

Langsmith allows you to keep track of how you use LLM and embedding models. It logs histories, token uses and other metadata. Follow these three simple steps to enable -

Sign up for an account with Langsmith
Generate an API Key from your admin page
Set the following environment keys in your project

export LANGCHAIN_TRACING_V2=true
export LANGCHAIN_ENDPOINT="https://api.smith.langchain.com"
export LANGCHAIN_PROJECT="<project name>"
export LANGCHAIN_API_KEY="<api key>"

Sample projects

Here's a list of projects / examples built with RagKit

Project	Description
nestjs-embedjs-template	A NestJS server side template
nextjs-chatbot-template	A NextJS chat template - including a chat UI
slack-bot	A slack bot that can answer questions based on learnt confluence spaces

Contributors

Want to contribute? That is as easy as forking and sending in a PR!

Name		Name	Last commit message	Last commit date
Latest commit History 133 Commits
dist		dist
examples		examples
scripts		scripts
src		src
.eslintrc.js		.eslintrc.js
.gitignore		.gitignore
.npmignore		.npmignore
.prettierignore		.prettierignore
.prettierrc		.prettierrc
CITATION.cff		CITATION.cff
LICENSE		LICENSE
README.md		README.md
package-lock.json		package-lock.json
package.json		package.json
tsconfig.cjs.json		tsconfig.cjs.json
tsconfig.json		tsconfig.json

License

theodi/embedJs

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EmbedJs

Features

Quick note

Contents

Getting started

Installation

Usage

Temperature

Search results count

Customize the prompt

Get context (dry run)

Get count of embedded chunks

Loaders supported

PDF file

Web page

Sitemap

Text

Youtube video

Youtube channel

Youtube search

Confluence

Add a custom loader

More loaders coming soon

LLMs

OpenAI

Mistral

Hugging Face

Azure OpenAI

Use custom LLM model

More LLMs coming soon

Embedding models

OpenAI v3 Small

OpenAI v3 Large

Ada

Cohere

Use custom embedding model

More embedding models coming soon

Vector databases supported

Pinecone

MongoDB Atlas

Description

Prerequisites

Instructions

Chroma

HNSWLib

Weaviate

Bring your own database

More databases coming soon

Caches

LMDB

MongoDB

InMemory

Redis

Bring your own cache

More caches coming soon

Langsmith Integration

Sample projects

Contributors

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License

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