OpenAI

import { OpenAI } from "@llamaindex/openai";
import { Settings } from "llamaindex";
 
Settings.llm = new OpenAI({ model: "gpt-3.5-turbo", temperature: 0, apiKey: <YOUR_API_KEY> });

export OPENAI_API_KEY="<YOUR_API_KEY>"

import { Document, VectorStoreIndex } from "llamaindex";
 
const document = new Document({ text: essay, id_: "essay" });
 
const index = await VectorStoreIndex.fromDocuments([document]);

const queryEngine = index.asQueryEngine();
 
const query = "What is the meaning of life?";
 
const results = await queryEngine.query({
  query,
});

import { OpenAI } from "@llamaindex/openai";
import { Document, Settings, VectorStoreIndex } from "llamaindex";
 
// Use the OpenAI LLM
Settings.llm = new OpenAI({ model: "gpt-3.5-turbo", temperature: 0 });
 
async function main() {
  const document = new Document({ text: essay, id_: "essay" });
 
  // Load and index documents
  const index = await VectorStoreIndex.fromDocuments([document]);
 
  // get retriever
  const retriever = index.asRetriever();
 
  // Create a query engine
  const queryEngine = index.asQueryEngine({
    retriever,
  });
 
  const query = "What is the meaning of life?";
 
  // Query
  const response = await queryEngine.query({
    query,
  });
 
  // Log the response
  console.log(response.response);
}