TheCrawler MCP Server

TheCrawler — AI-ready web scraper with validated extraction contracts

Scrape web pages, run LLM-powered structured extraction, or diagnose whether URLs are ready for a built-in extraction contract before spending LLM tokens. Open source engine (AGPL-3.0). $0.005 per successfully scraped page on Apify.

Start with a safe test: run one public URL with dryRun: true on Apify, or clone the current GitHub source and run the local CLI/MCP build from engine/. A small proof pack is in examples/diagnostic-challenge, including a sample readiness report at examples/diagnostic-challenge/sample-report.md.

$500 extraction readiness sprint

Use this when you need to know whether one real public-web workflow is worth automating before you spend engineering time on extraction.

• Scope: up to 25 public URLs and one target output shape.
• First step: send a public fit check through the structured issue form or use the private fit-check path on the sprint page.
• Payment: requested only after the workflow looks like a fit, by one-off $500 payment link or invoice.
• Output: a readiness report with ready, mixed, blocked, or not-worth-automating-yet guidance.
• Credit: if the workflow continues into setup or hosted usage, the $500 is credited toward that next step.

The public offer thread is GitHub issue #1. The proof pack includes a sample readiness report showing the report shape before a buyer sends URLs.

Public fit checks should use this shape:

Workflow type:
Public URLs (up to 25):
Target output shape / required fields:
Known blockers or constraints:
Timing:

Do not include login credentials, private URLs, personal data, or raw customer data in GitHub issues.

What makes this different

• Validated extraction contracts: select a built-in contract, get normalized data plus validation.valid, required fields, and missing-field evidence. Current contracts: real-estate-listing, product-page, docs-page.
• Brand identity extraction (extractBrand: true): one call returns the site's ranked color palette, themeColor, and best-guess logo candidates (JSON-LD / header SVG / favicons / og:image). In Playwright mode it reads rendered colors via getComputedStyle — works on SPAs where static CSS can't. Deterministic, no LLM.
• Content controls: onlyMainContent plus includeTags / excludeTags (CSS allow/deny) strip nav, footer, sidebars, and ads from text, markdown, links, and HTML output. Firecrawl-compatible. waitFor alias supported.
• HTML formats: extractHtml (cleaned, main-content HTML) and extractRawHtml (full serialized DOM) alongside markdown.
• No-LLM diagnostics: run diagnoseMode to score source readiness, identify blockers, and save a buyer-readable Markdown report before extraction.
• LLM-powered extraction: send a JSON Schema or use a contract, get parsed typed data back. Endpoint-agnostic — point at OpenAI, your own llama.cpp / vLLM / LM Studio / Ollama. You bring the LLM, no vendor lock-in.
• Adaptive crawling: Cheerio first (fast HTTP+parse), auto-fall-back to Playwright when an SPA shell is detected. Keeps browser rendering optional instead of mandatory for every page.
• Structured errors: errorType enum (dns | timeout | rate-limit | blocked-bot | js-required | http-4xx | http-5xx | parse | network | unknown) + errorRetryable boolean. Agents branch programmatically — no regex on error strings.
• Challenge-page detection: 200 OK responses with access-control or challenge-page bodies are flagged as errorType: 'blocked-bot' instead of returning challenge HTML as useful content.
• Out-of-box extractors: JSON-LD, microdata, commerce data (price/SKU/rating), forms with field types, 16 analytics trackers detected (GA4, GTM, Meta Pixel, Hotjar, Segment, Mixpanel, etc.), hreflang, pagination, redirect chain. Email-like and phone-like public text extraction is opt-in.
• Heading-aware RAG chunking: markdown chunked at h1-h3 boundaries with overlap and per-chunk SHA. Feed straight to a vector DB.

Three modes

Safe first run

Use dryRun: true for an Apify smoke test. The actor crawls the page but does not emit a billing event.

{
  "urls": ["https://example.com"],
  "extractMarkdown": true,
  "dryRun": true
}

For the current local MCP/CLI build:

git clone https://github.com/manchittlab/TheCrawler.git
cd TheCrawler/engine
npm install
npm run build
node dist/cli.js crawl https://example.com --markdown

Plain crawl (default)

{
  "urls": ["https://example.com"],
  "extractMarkdown": true,
  "rotateUserAgent": true,
  "requestRetries": 3
}

Returns rich PageData per URL: title, description, language, canonical URL, robots directives, full text, boilerplate-stripped markdown, links (with internal/external flag), images (with lazy-load src), meta tags, OG/Twitter Card, JSON-LD, microdata, commerce data, forms, analytics-detected, optional email-like/phone-like public text fields, social links, hreflang, pagination, redirect chain, response headers + timing, plus structured errorType + errorRetryable on failure.

LLM-powered extract mode

{
  "urls": ["https://shop.example.com/products/123"],
  "extractMode": true,
  "extractJsonSchema": {
    "type": "object",
    "properties": {
      "productName": { "type": "string" },
      "price": { "type": "number" },
      "currency": { "type": "string" },
      "inStock": { "type": "boolean" }
    },
    "required": ["productName"]
  },
  "llmBaseUrl": "https://api.openai.com/v1/chat/completions",
  "llmModel": "gpt-4o-mini"
}

Crawls the URL → cleans to markdown → sends (markdown + schema) to your OpenAI-compatible chat-completions endpoint → returns parsed typed data per URL. Schema-backed extraction uses JSON Schema response format where supported, with fallbacks for endpoints that only support JSON-object or text output. Supports natural-language extractPrompt instead of/alongside the schema. The actor charges per page like normal; the LLM call cost is whatever your endpoint charges.

Note: extract mode requires a publicly-reachable LLM endpoint. LAN URLs (e.g. http://192.168.x.x) are not reachable from Apify infrastructure. Use OpenAI, hosted vLLM, or expose your local server via a tunnel.

Set THECRAWLER_LLM_API_KEY as an Actor environment variable so the LLM key never lands in run inputs (visible in run history).

Contract diagnostic mode

{
  "urls": ["https://example.com/listing-1", "https://example.com/listing-2"],
  "diagnoseMode": true,
  "extractContract": "real-estate-listing",
  "diagnosticReport": true
}

Runs crawl + readiness scoring without an LLM call. Dataset output includes per-URL verdict, readyForExtraction, score, blockers, warnings, and recommendedNextStep, plus a workflow summary. When diagnosticReport is true, the actor saves contract-diagnostic-report in the run key-value store as Markdown with a missing-readiness-signal summary. The report intentionally excludes raw extracted contact details.

Contract extract mode

{
  "urls": ["https://example.com/listing-1"],
  "extractMode": true,
  "extractContract": "product-page",
  "llmBaseUrl": "https://api.openai.com/v1/chat/completions",
  "llmModel": "gpt-4o-mini"
}

Uses the selected contract schema and prompt, then appends contract validation to the extraction result. Agents can branch on validation.valid and validation.missingRequiredFields instead of trusting loose markdown. Built-in contracts currently cover real-estate-listing and product-page.

Reliability features

Search → scrape

Top-N Google results crawled in one call. Optional SerpAPI key for reliable search.

{ "searchQuery": "best CRM 2026", "searchLimit": 10, "extractMarkdown": true }

Sitemap → scrape

Sitemap.xml + sitemap-index files resolved automatically.

{ "sitemapUrl": "https://example.com/sitemap.xml", "maxPages": 50 }

File extraction

PDF and DOCX URLs are auto-detected and parsed. Returns extracted text + (for PDFs) metadata, page count.

Pricing

• Crawl mode: $0.005 per page successfully scraped (failed pages don't charge).
• Extract mode / diagnostic mode: still charged per successfully scraped page. LLM endpoint cost is paid by the endpoint owner, not by this actor.
• Extraction readiness sprint: $500 after fit confirmation for one public workflow: up to 25 public URLs, one target output shape, and a ready / mixed / blocked report. Payment is by one-off link or invoice after scope is confirmed. If the workflow continues into setup or hosted usage, the $500 is credited toward that next step. If another stack is a better fit, the report says so.

Beyond the Apify Store

The current open-source engine source for this actor build is in engine/; drop it into your own Node project, MCP server, CLI, or REST API server. The published npm package is older than this GitHub source until the next npm publish, so use the GitHub-source path below for current validated-contract and MCP tools. Self-hosting avoids Apify per-page charges, while your own infrastructure and LLM endpoint costs still apply.

# Current GitHub source build
cd engine
npm install
npm run build

# CLI
node dist/cli.js crawl https://example.com --markdown
node dist/cli.js extract https://example.com --schema '{...}'

# MCP server (Cline, Claude Code, Cursor, Windsurf)
node dist/mcp.js

# REST API server
THECRAWLER_API_KEY=local_test_key node dist/server.js --port 3000
curl -H "Authorization: Bearer local_test_key" \
  "http://localhost:3000/v1/contracts?includeSchema=true"
curl -X POST "http://localhost:3000/v1/scrape" \
  -H "Authorization: Bearer local_test_key" \
  -H "Content-Type: application/json" \
  -d '{"url":"https://example.com/product","formats":["markdown","metadata","links","structuredData","commerceData"]}'
curl -X POST "http://localhost:3000/v1/diagnose" \
  -H "Authorization: Bearer local_test_key" \
  -H "Content-Type: application/json" \
  -d '{"contractName":"product-page","urls":["https://example.com/product"],"reportMarkdown":true}'
curl -X POST "http://localhost:3000/v1/map" \
  -H "Authorization: Bearer local_test_key" \
  -H "Content-Type: application/json" \
  -d '{"url":"https://example.com","maxPages":1}'
curl -X POST "http://localhost:3000/v1/extract-contract" \
  -H "Authorization: Bearer local_test_key" \
  -H "Content-Type: application/json" \
  -d '{"contractName":"product-page","urls":["https://example.com/product"],"llmBaseUrl":"http://localhost:1234/v1/chat/completions","llmModel":"qwen/qwen3.5-9b"}'

# Older npm package; use for plain crawl only until the next publish
npm install thecrawler
thecrawler crawl https://example.com --markdown

For Cline setup from a GitHub clone, use llms-install.md. The current GitHub source is the review path for validated contracts and MCP tools until npm is updated.

GitHub: https://github.com/manchittlab/TheCrawler · License: AGPL-3.0