LangGraph

npm install @langchain/langgraph @langchain/openai firecrawl

FIRECRAWL_API_KEY=your_firecrawl_keyOPENAI_API_KEY=your_openai_key

import { Firecrawl } from 'firecrawl';import { ChatOpenAI } from '@langchain/openai';import { StateGraph, MessagesAnnotation, START, END } from '@langchain/langgraph';// Initialiser Firecrawlconst firecrawl = new Firecrawl({ apiKey: process.env.FIRECRAWL_API_KEY });// Initialiser le LLMconst llm = new ChatOpenAI({    model: "gpt-5-nano",    apiKey: process.env.OPENAI_API_KEY});// Définir le nœud de scrapingasync function scrapeNode(state: typeof MessagesAnnotation.State) {    console.log('Scraping...');    const result = await firecrawl.scrape('https://firecrawl.dev', { formats: ['markdown'] });    return {        messages: [{            role: "system",            content: `Scraped content: ${result.markdown}`        }]    };}// Définir le nœud d'analyseasync function analyzeNode(state: typeof MessagesAnnotation.State) {    console.log('Analyzing...');    const response = await llm.invoke(state.messages);    return { messages: [response] };}// Construire le grapheconst graph = new StateGraph(MessagesAnnotation)    .addNode("scrape", scrapeNode)    .addNode("analyze", analyzeNode)    .addEdge(START, "scrape")    .addEdge("scrape", "analyze")    .addEdge("analyze", END);// Compiler le grapheconst app = graph.compile();// Exécuter le workflowconst result = await app.invoke({    messages: [{ role: "user", content: "Summarize the website" }]});console.log(JSON.stringify(result, null, 2));

import { Firecrawl } from 'firecrawl';import { ChatOpenAI } from '@langchain/openai';import { StateGraph, Annotation, START, END } from '@langchain/langgraph';const firecrawl = new Firecrawl({ apiKey: process.env.FIRECRAWL_API_KEY });const llm = new ChatOpenAI({ model: "gpt-5-nano", apiKey: process.env.OPENAI_API_KEY });// Définir l'état personnaliséconst WorkflowState = Annotation.Root({    urls: Annotation<string[]>(),    scrapedData: Annotation<Array<{ url: string; content: string }>>(),    summary: Annotation<string>()});// Scraper plusieurs URLasync function scrapeMultiple(state: typeof WorkflowState.State) {    const scrapedData = [];    for (const url of state.urls) {        const result = await firecrawl.scrape(url, { formats: ['markdown'] });        scrapedData.push({ url, content: result.markdown || '' });    }    return { scrapedData };}// Résumer tout le contenu scrapéasync function summarizeAll(state: typeof WorkflowState.State) {    const combinedContent = state.scrapedData        .map(item => `Content from ${item.url}:\n${item.content}`)        .join('\n\n');    const response = await llm.invoke([        { role: "user", content: `Summarize these websites:\n${combinedContent}` }    ]);    return { summary: response.content as string };}// Construire le graphe du workflowconst workflow = new StateGraph(WorkflowState)    .addNode("scrape", scrapeMultiple)    .addNode("summarize", summarizeAll)    .addEdge(START, "scrape")    .addEdge("scrape", "summarize")    .addEdge("summarize", END);const app = workflow.compile();// Exécuter le workflowconst result = await app.invoke({    urls: ["https://firecrawl.dev", "https://firecrawl.dev/pricing"]});console.log(result.summary);