LangChain with JavaScript 🦜️ - COMPLETE TUTORIAL - Basics to advanced concept!

In this Video I will give you a complete Introduction to langchain from Chains, Promps, Parers, Indexes, Vector Databases, Agents, Memory. A LOT to learn here! Stay turned. This course is suited for web developers who want to interact with language models and not learn Python.
If you are more interested in Python, take a look here: • LangChain 🦜️ - COMPLET...
Repo for my Code: github.com/Coding-Crashkurse/...
Timestamps:
0:00 Course Overview
1:30 Project setup and installation
3:00 Talk to the OpenAI API without langchain
7:04 Chains and Prompts Basics
9:05 Intermediate Chains: SequentialChains
14:20 OutputParsers and ResponseSchemas
17:52 Index - Loaders, Splitters, VectorDBs, RetrievalChains
26:37 Memory - use ConversationMemory
30:06 Agents - LLms plus Tools
#langchain , #chatgpt

[@codingcrashcourses8533]

Sign up for my complete LangChain course: www.udemy.com/course/langchain-in-action-develop-llm-powered-applications/?couponCode=557BD137E003DD93E491

[@ihateorangecat]

Love it!! Please keep on making JS-AI contents. 👍

[@kelvingitaumburu925]

Quite detailed. Thank you for this

[@ditakreger4851]

Danke dir für das video. auf jeden fall hat es mir geholfen✌️🤙

[@shanayshukla2145]

Gotta say one of the best videos on Langchain so far pls continue making this legacy content

[@codingcrashcourses8533]

Thanks, since the interest is quite high, i think about it :)

[@AdrianMark]

You are amazing. I'm a web dev, and I found your channel because of the first langchain tutorial. Then I find this, you have thought of everything! Truly grateful, and I'm keeping a close watch to learn from you. For your info, I would most certainly pay for a course by you on bringing an LLM app to production.

[@codingcrashcourses8533]

There are already some vidoes about this in my playlist. Microservice pattern und deployment on ms azure

[@AdrianMark]

@@codingcrashcourses8533 Thank you, yes, I've had time to go through the rest of the videos. Truly excellent. I have a lot of learning to do to get up to the right level, and will keep coming back for more.

[@nasimreja7312]

@@AdrianMark same here

[@varaprasad10]

Bro believe me, you helped me a lot with this video. The content you gave me exactly what I need to know Thank you very much.

[@raphauy]

Awesome! Thnak you!!! You are the best!

[@dishasathavara]

Well Explained!!! Thank you so much for the video

[@user-ud8cx9wl8q]

great course thanks man

[@jeremydudet]

this was helpful thank you

[@rossanobr]

Amazing!

[@MrAdityakool]

This guy is a blessing

[@codingcrashcourses8533]

How sweet ;)

[@pedroalmeida8576]

Este video foi incrivel, vou colocá-lo em prática agora mesmo. Muito Obrigado

[@codingcrashcourses8533]

Gracias ;)

[@amigos786]

Awesome!

[@sasukeuchiha-ck4hy]

Thank you for the video, it was incredibly helpful. I was wondering if you could create a video that demonstrates the integration of all these elements. It would be fantastic to see how to set up a conversation, that will be stored, that utilizes sequential chains, incorporates the Vector Database, and implements an Agent. Watching all these components work together would be truly insightful. Managing chains, especially in larger projects, is a challenge I'm trying to overcome.

[@codingcrashcourses8533]

I did something quite complex in a different Video. Also doing a microservice architecture in my udemy course

[@sasukeuchiha-ck4hy]

@@codingcrashcourses8533 In which video?

[@hastingskondwani1066]

A big fan of this channel. Please make a tutorial on how we can create a next js chatbot with vercel ai sdk and langchain.

[@codingcrashcourses8533]

thank you very much. To be honest, I have to find that out on my own first. I will pick that up next weekend :)

[@programmingholic]

Bro , You need to create Playlist for individual Videos which you have covered, so we can bookmark

[@emiremark2889]

excellent course, covers the basics to get started, i prefer the frame work in Javascript Node.js although i know the libraries are the same as the python one

[@codingcrashcourses8533]

Yes, already a little bit outdated unfortunately. But thanks :)

[@buksa7257]

Nice and clear video. Maybee something for the future: I'd like to know more about how to create a custom tool, like creating a database connection and sending SQL as input for example. I tried using the calculato.jcs file as a template for a new custom tool but i get all kinds of errors from the library i dont understand unfortunately

[@codingcrashcourses8533]

Well this is an advanced request not many might be interested in. I also have other, more project based videos on the channel. This is just an Intro to the lib

[@heydibyendu]

Great teaching style. I am trying the code on typescript but having a problem with importing langchain. How can we work on typescript?

[@codingcrashcourses8533]

first of all - thank you very much! Where is the error happening?

[@heydibyendu]

@@codingcrashcourses8533 I have installed langchain using: npm install -S langchain However, when I import I get the following error. I have put the target in tsconfig as ES2020, too: ../../../../node_modules/langchain/dist/callbacks/handlers/tracer.d.ts:22:23 - error TS2583: Cannot find name 'Map'. Do you need to change your target library? Try changing the 'lib' compiler option to 'es2015' or later. 22 protected runMap: Map; ~~~ Found 1 error in ../../../../node_modules/langchain/dist/callbacks/handlers/tracer.d.ts:22

[@tiagoc9754]

Late for the party, but the error is in your import. I suppose you're trying to "import {callbacks} from 'langchain'. But thats deprecated. You should do something like 'import {handlers} from 'langchain/callbacks' This is not a copy and paste solution, but just to express the idea that now you have to import from the individual modules instead of root 'langchain'

[@nathanie1637]

Can LangChain JS work with a locally running Llama.cpp? if so, do you have any materials on getting that up and running?

[@codingcrashcourses8533]

sorry, don´t have to much experience with LLama :/

[@pratikpednekar5363]

Hi, can someone tell me how this memory would work in case of rest api? Does it cache the data locally using the memory key?

[@codingcrashcourses8533]

REST Services should be stateless, so you should handle the memory outside of that service. I recommend not using the memory class inside a REST Service. I created multiple videos on langchain in production and one makes use of redis as memory. Here is the video: kzbin.info/www/bejne/f5CXm3ikedx6ras

[@arberstudio]

for the agent tools chain, is it passing all that info to the LLM? cause that looks like a whole lot of tokens…

[@codingcrashcourses8533]

Yes it is. Thats why i am Not the Biggest Fan of agents

[@kunal930]

Is there any other way to perform this without using the OPENAI_API_KEY, as the data is not secured when key is used

[@codingcrashcourses8533]

what do you mean? Why shouldn´t that be safe? You have to provide an API key to use OpenAI

[@TonyGizer]

How can I use the data returned from my embeddings in the browser?

[@codingcrashcourses8533]

kzbin.info/www/bejne/f5CXm3ikedx6ras take a Look here

[@sanfenli]

Sorry , how to use those JS file in HTML file ? I do ,but wrong

[@codingcrashcourses8533]

I would recommend to build an express api around this

[@fvckprth]

Do you know how to text split a pdfs? Great content btw

[@codingcrashcourses8533]

js.langchain.com/docs/modules/data_connection/document_loaders/integrations/file_loaders/pdf Step1: Use PdfLoader Step2: Use the splitter you want :)

[@longsyee]

is a nice one but i think latest version open ai chaged witout using the new Configuration

[@codingcrashcourses8533]

Yep, that was updated quite a bit :)

[@Sarvesh_Ganesan]

Is it possible for you to make a tutorial on how to use langchain JS with Amazon Bedrock API? I don't see many tutorials on the same. If you could do that, it would be super helpful. Great video by the way!

[@codingcrashcourses8533]

Currently not planned. I am pretty unfamiliar with everything from amazon

[@tiagoc9754]

Do you recommend any free to use LLM? OpenAI is no longer free and I just would like to play around langchain. Also, how safe are the LLMs to use in terms of getting our data exposed for their own ML scripts? I mean, will ChatGPT be trained by my chain calls using my private database resources?

[@codingcrashcourses8533]

Llama2 is currently state of the Art for open Source models. For openai models you can opt out, but i would recommend against using it for sensitive data.

[@tiagoc9754]

@@codingcrashcourses8533 thank you very much!

[@tiagoc9754]

@@codingcrashcourses8533 wow, really appreciated the llama 2 recommendation. I'm reading some articles and it looks amazing. I'm just wondering about the model being trained using our private data as well. I'll check if I can find an optout as you mentioned OpenAI does. Thanks again!

[@wordpressmagics2613]

Hi. Can you please help select from LangChain objects? I need functionality from LangChain that allows me to switch a prompt (or probably a chain) if the user asks "How do I pay less tax?". If he asks this question, I need to ask him about his form of ownership, type of taxation, etc. and then use this information to select another prompt for further processing. But I use ConversationalRetrievalQAChain to work with OpenAI and Pinecone. My question is what is better to use for such a task? SequentialChain or Router or something else? Please not that I use TypeScript to write this app. Thank you!

[@codingcrashcourses8533]

I have the same task (with python) and do it like this. I use a custom classfier chain that returns an object. I run normal LLMChains and add the documents from the vectorstore manually, since it gives me more control, but thats of course up to you :)

[@wordpressmagics2613]

@@codingcrashcourses8533 Sounds not so easy for me, especially considering JS/TS langchain isn't the same as Python version (not all of the objects are there. I couldn't find Router for example). Could you maybe shot a tutorial about this Dynamic Prompting with your custom Chain class or with some langchain object? :) I can't understand how those other chains would have the same "memory" as my default. Especially if simple chains doesn't have Vector store parameters in its initialisers.

[@codingcrashcourses8533]

@@wordpressmagics2613 Yeah, Router Chain seems not to exist (yet). Well, all these chains in the end help you to create a final prompt for the LLM which you send to the API. If you understand what the API expects and what the Interfaces of the Classes do under the hood, you can choose if you want a more high level chain or not. In the end, you can also build the history yourself if you want

[@wordpressmagics2613]

@@codingcrashcourses8533 Can I somehow get a paid consultation from you about how can I solve my problem in JavaScript?

[@PinguinPvPPlays]

Great video I need help within my project do you think you can answer me some questions?

[@codingcrashcourses8533]

It depends on the Kind of questions. I can not do Personal consulting for everyone. I hope that is understandable

[@kunal930]

⚠️👉Please make more tutorials on✨ Generative AI, or please tell me where i can learn this. 🌞🌈You are doing great work ❣️👍

[@CodingDecay]

1 problem. The model `text-davinci-003` has been deprecated which basically all of them use.

[@codingcrashcourses8533]

Langchain Allows you to easily switch to another model :)

[@hcrrby2996]

That is true ​@@codingcrashcourses8533 Just wanted to mention it, really nice tutorial tho

[@raoulkoenigaachen]

const model = new OpenAI({ temperature: 0, modelName:"gpt-4" });

[@jotiradityabanerjee2698]

Could you make a tutorial on how to make applications with rete.js

[@codingcrashcourses8533]

sorry, I never heard of that before ;-)

[@jotiradityabanerjee2698]

@@codingcrashcourses8533 could u please check??🙃

[@robottinkeracademy]

man...do you sleep? Awesome work

[@lukem121]

Why no typescript?

[@codingcrashcourses8533]

I sticked close to the official documention

[@lukem121]

@@codingcrashcourses8533 Ah I see! Thank you for creating this content. If you make more I will be sure to watch 😃

[@codingcrashcourses8533]

@@lukem121 most of my content will be in python. Thats where I earn my money and am really good at. Js and Frontend is more of a Hobby ;).

I don't understand why to use langchain! It make simple things became complex! And also remove all freedom the programs have because of this "chains"! But, in other hands the TOOLS are the best ones!! I just use the tools! forget about this complicated chains and rules to use things and "this must do in this way", that's not why programming was made for!

[@namesare4fools]

Love it!! Please keep on making JS-AI contents. 👍