Build AI-Powered Apps with OpenAI and Node.js

This repo is a companion to the Build AI-Powered Apps with OpenAI and Node.js course on Frontend Masters.

Materials

• Course Notes

Errata

Document QA Query Function Lesson

A few of the Langchain methods used in this course have been deprecated. Here's an alternative approach:

Install the Langchain community module

npm i @langchain/community

Import the loaders

import { PDFLoader } from '@langchain/community/document_loaders/fs/pdf'
import { YoutubeLoader } from '@langchain/community/document_loaders/web/youtube'
import { CharacterTextSplitter } from 'langchain/text_splitter'

Create the loaders using the community methods:

In docsFromYTVideo:

const loader = YoutubeLoader.createFromUrl(video, { language: 'en', addVideoInfo: true, })
  const loadedDoc = await loader.load()
  const splitter = new CharacterTextSplitter({
    separator: ' ',
    chunkSize: 2500,
    chunkOverlap: 200,
  })
  return await splitter.splitDocuments(loadedDoc)

In docsFromPDF:

const docsFromPDF = async () => { const loader = new PDFLoader('./xbox.pdf')
  const loadedDoc = await loader.load()
  const splitter = new CharacterTextSplitter({
    separator: '. ',
    chunkSize: 2500,
    chunkOverlap: 200,
  })
  return await splitter.splitDocuments(loadedDoc)