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Node.js

Fastify

Use Firecrawl with Fastify to build high-performance web scraping and search APIs.

Prerequisites

Setup

npm install fastify firecrawl

Add your API key to .env:

FIRECRAWL_API_KEY=fc-YOUR-API-KEY

Search the web

import Fastify from "fastify";
import { Firecrawl } from "firecrawl";

const fastify = Fastify({ logger: true });
const firecrawl = new Firecrawl({ apiKey: process.env.FIRECRAWL_API_KEY });

fastify.post("/search", async (request) => {
  const { query } = request.body;
  return firecrawl.search(query, { limit: 5 });
});

fastify.listen({ port: 3000 });

Scrape a page

fastify.post("/scrape", async (request) => {
  const { url } = request.body;
  return firecrawl.scrape(url);
});

Interact with a page

Use interact to control a live browser session — click buttons, fill forms, and extract dynamic content.

fastify.post("/interact", async (request) => {
  const { url } = request.body;

  const result = await firecrawl.scrape(url, { formats: ['markdown'] });
  const scrapeId = result.metadata?.scrapeId;

  await firecrawl.interact(scrapeId, { prompt: 'Search for iPhone 16 Pro Max' });
  const response = await firecrawl.interact(scrapeId, { prompt: 'Click on the first result and tell me the price' });

  await firecrawl.stopInteraction(scrapeId);

  return { output: response.output };
});

As a Fastify plugin

Encapsulate the client in a plugin for reuse across routes:

import fp from "fastify-plugin";
import { Firecrawl } from "firecrawl";

export default fp(async function firecrawlPlugin(fastify) {
  const client = new Firecrawl({ apiKey: process.env.FIRECRAWL_API_KEY });
  fastify.decorate("firecrawl", client);
});

Register the plugin, then use fastify.firecrawl in any route:

fastify.register(firecrawlPlugin);

fastify.post("/search", async function (request) {
  const { query } = request.body;
  return this.firecrawl.search(query, { limit: 5 });
});

Test it

curl -X POST http://localhost:3000/search \
  -H "Content-Type: application/json" \
  -d '{"query": "firecrawl web scraping"}'

Next steps

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