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+# @basango/crawler
+
+A powerful, scalable web crawler application built with Node.js and TypeScript for extracting and processing data from various news sources and websites.
+
+The Basango Crawler is designed to systematically crawl news websites and extract article content. It supports both synchronous and asynchronous crawling modes, with configurable sources, queue-based processing, and robust error handling.
+
+## Features
+
+- **Multi-mode Operation**: Synchronous and asynchronous crawling capabilities
+- **Queue-based Processing**: Uses BullMQ with Redis for scalable job processing
+- **Configurable Sources**: JSON-based configuration for different website sources
+- **HTML & WordPress Support**: Built-in parsers for HTML websites and WordPress APIs
+- **Rate Limiting**: Respects website rate limits and implements backoff strategies
+- **Data Persistence**: JSONL output format for processed articles
+- **Worker Management**: Distributed worker system for parallel processing
+- **Type Safety**: Full TypeScript implementation with Zod schema validation
+
+## Prerequisites
+
+- [Bun](https://bun.sh/) runtime (recommended) or Node.js (v22+)
+- Redis server (for async operations)
+- TypeScript knowledge for configuration
+
+## Installation
+
+```bash
+# Navigate to the crawler directory
+cd basango/apps/crawler
+
+# Install dependencies
+bun install
+```
+
+## Configuration
+
+### 1. Environment Variables
+
+Create a `.env.local` file with the following variables:
+
+```bash
+# Redis configuration for async operations
+BASANGO_CRAWLER_ASYNC_REDIS_URL=redis://localhost:6379/0
+BASANGO_CRAWLER_ASYNC_QUEUE_LISTING=listing
+BASANGO_CRAWLER_ASYNC_QUEUE_DETAILS=details
+BASANGO_CRAWLER_ASYNC_QUEUE_PROCESSING=processing
+
+# Fetch configuration
+BASANGO_CRAWLER_FETCH_MAX_RETRIES=3
+BASANGO_CRAWLER_FETCH_RESPECT_RETRY_AFTER=true
+BASANGO_CRAWLER_FETCH_USER_AGENT=Basango/0.1 (+https://github.com/bernard-ng/basango)
+
+# Crawler behavior
+BASANGO_CRAWLER_UPDATE_DIRECTION=forward
+
+# TTL settings (in seconds)
+BASANGO_CRAWLER_ASYNC_TTL_FAILURE=3600
+BASANGO_CRAWLER_ASYNC_TTL_RESULT=3600
+```
+
+### 2. Source Configuration
+
+Sources are configured in `config/sources.json`. Example source configuration:
+
+```json
+{
+  "sources": {
+    "html": [
+      {
+        "sourceId": "example.com",
+        "sourceKind": "html",
+        "sourceUrl": "https://example.com",
+        "sourceSelectors": {
+          "articles": ".article-list .article",
+          "articleTitle": "h2.title",
+          "articleLink": "a.permalink",
+          "articleDate": ".publish-date",
+          "articleBody": ".content",
+          "pagination": ".pagination .next"
+        },
+        "requiresDetails": true,
+        "supportsCategories": false
+      }
+    ]
+  }
+}
+```
+
+## Usage
+
+### Synchronous Crawling
+
+Perfect for immediate, one-time crawling tasks:
+
+```bash
+# Crawl a specific source
+bun run crawler:sync -- --sourceId radiookapi.net
+
+# Crawl with page range filter
+bun run crawler:sync -- --sourceId radiookapi.net --pageRange 1:5
+
+# Crawl with date range filter
+bun run crawler:sync -- --sourceId radiookapi.net --dateRange 2024-01-01:2024-01-31
+
+# Crawl specific category (if supported)
+bun run crawler:sync -- --sourceId example.com --category politics
+```
+
+### Asynchronous Crawling
+
+Best for large-scale operations and when you need job queuing:
+
+```bash
+# Schedule an async crawl job
+bun run crawler:async -- --sourceId radiookapi.net
+
+# Schedule with filters
+bun run crawler:async -- --sourceId radiookapi.net --pageRange 1:10 --category economics
+```
+
+### Worker Management
+
+Start workers to process async jobs:
+
+```bash
+# Start workers for all queues
+bun run crawler:worker
+
+# Start workers for specific queues
+bun run crawler:worker -- --queue listing --queue details
+
+# Start workers with short option
+bun run crawler:worker -- -q listing -q processing
+```
+
+## CLI Options
+
+### Crawling Commands
+
+| Option | Description | Example |
+|--------|-------------|---------|
+| `--sourceId` | **Required.** Source identifier from sources.json | `--sourceId radiookapi.net` |
+| `--pageRange` | Page range to crawl (format: start:end) | `--pageRange 1:5` |
+| `--dateRange` | Date range filter (format: YYYY-MM-DD:YYYY-MM-DD) | `--dateRange 2024-01-01:2024-01-31` |
+| `--category` | Category slug to crawl | `--category politics` |
+
+### Worker Commands
+
+| Option | Description | Example |
+|--------|-------------|---------|
+| `--queue`, `-q` | Specify queue(s) to process (can be used multiple times) | `--queue listing --queue details` |
+
+## Project Structure
+
+```
+basango/apps/crawler/
+├── src/
+│   ├── config.ts              # Configuration schema and loading
+│   ├── constants.ts           # Application constants
+│   ├── schema.ts              # Zod validation schemas
+│   ├── utils.ts               # Utility functions
+│   ├── http/                  # HTTP client and utilities
+│   ├── process/               # Core crawling logic
+│   │   ├── async/             # Async processing (queues, workers)
+│   │   ├── sync/              # Synchronous processing
+│   │   ├── parsers/           # Content parsers (HTML, WordPress)
+│   │   ├── crawler.ts         # Main crawler interface
+│   │   └── persistence.ts     # Data persistence layer
+│   ├── scripts/               # CLI entry points
+│   │   ├── crawl.ts           # Sync crawling script
+│   │   ├── queue.ts           # Async job scheduling
+│   │   ├── worker.ts          # Worker process
+│   │   └── utils.ts           # CLI utilities
+│   └── __tests__/             # Test files
+├── config/
+│   ├── sources.json           # Source configurations
+│   └── pipeline.json          # Pipeline settings
+├── data/                      # Output directory for crawled data
+└── package.json
+```