What you’ll learn
- Set up scraping requests with anti-bot bypass and JavaScript rendering
- Extract property URLs from Zillow listing pages using CSS selectors
- Handle dynamic content loading and page scrolling
- Configure custom JavaScript instructions for reliable data extraction
Why Scrape Real Estate Data
Real estate professionals need timely, comprehensive market data to make informed decisions. Web scraping enables automated data collection that provides several advantages:Market intelligence
- Monitor new listings as they appear on property websites
- Track pricing trends across different neighborhoods and property types
- Identify properties that match specific investment criteria
Investment analysis
- Access comprehensive property data for market research
- Compare property specifications across multiple listings
- Analyze market conditions in target areas
Lead generation
- Identify potential investment opportunities from listing data
- Build databases of properties that meet client requirements
- Monitor competitor listings and market activity
Step 1: Test With a Basic Scraping Setup
Start by creating a scraping function that handles Zillow’s anti-bot measures. The site requires JavaScript Rendering and Premium Proxies for reliable access.Python
js_render parameter enables JavaScript processing, while premium_proxy provides residential IP addresses to avoid blocking. Setting proxy_country to “us” positions requests from IP addresses based in the US.
Step 2: Handle Dynamic Content
Parameters, such aswait, wait_for, and js_instructions, allow customizing requests to handle dynamic rendering.
Modify the request parameter with a 2-second generic delay (wait) to allow elements to load.
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js_instructions parameter. This helps capture property listings that extend beyond the viewport.
Also define the js_instructions separately as a stringified parameter. The instructions include an extra wait command. This adds a specific delay for elements to load after the scrolling action has completed.
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js_instructions parameter.
Here’s the updated code:
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Step 3: Extract Property URLs from Listing Pages
Now you’ll extract individual property page links from the Zillow listing. Use ZenRows’css_extractor feature to automatically pull these URLs from the page.
Here’s a stringified format of the css_extractor:
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css_extractor parameter to the scraper function and specify it in the ZenRows params. Since we’re extracting specific content, update the scraper function to return the data as JSON rather than plain text. Execute the function with the listing_url, listing_css_extractor, and listing_js_instructors as parameters.
Here’s the updated code:
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JSON Response
Next Steps
Once you have the property URLs, you can use them to extract detailed property data from individual listing pages. Learn how to do this in our Extract Property Data tutorial.Data management best practices
1
Structure for your use case
Design your data structure to match your specific business needs, rather than using a generic approach. For example, if you need to analyze price trends, structure price history as date/price pairs, not raw HTML. Map scraped fields directly to your business entities (e.g., property, agent, transaction) and use consistent, clear field names that work for your team and future use.
2
Validate before storage
Check for missing or malformed fields, unexpected data types, duplicate entries, or values outside the expected range. Use validation scripts or schema checks (e.g., using Python’s pydantic or JSON Schema). Automate this process to maintain consistency throughout your data extraction workflow.
3
Preserve raw data
Store both cleaned and raw data separately. Raw data serves as a backup for debugging and reprocessing when requirements change.
4
Determine the storage format
Choose the storage format that best fits your data and use case. Common options include:
- JSON: Best for nested, hierarchical, or complex data structures. Human-readable and widely supported across platforms and protocols.
- CSV: Ideal for flat, tabular data. Easy to use in spreadsheets and many analytics tools.
- Databases (e.g., MongoDB, PostgreSQL): Suitable for large datasets that require frequent updates and querying.
- Vector databases: Designed for storing vectorized data, such as embeddings for LLM (Large Language Model) consumption.
Troubleshooting
Missing data
Solution 1: Employ adequate delay strategies to allow dynamic content to load. These include generic waits, waiting for specific elements, or pausing after scrolling or navigation. Solution 2: If usingcss_extractor, check and ensure you’ve used the correct CSS selectors. Test each selector using the ZenRows Request Builder before integrating it into your codebase. Create an DOM monitoring strategy to spot site structural changes. Isolate selectors from your codebase for easy debugging and troubleshooting.
CAPTCHA/anti-bot challenges
Solution 1: Ensure you’ve applied anti-bot bypass parameters likejs_render and premium_proxy.
Solution 2: If you continue to be blocked by in-page CAPTCHAs or those attached to form fields, easily integrate a CAPTCHA-solving service like 2Captcha from our solver integration options. Check our 2Captcha integration guide for more information.
Solution 3: Use fallbacks or alternative pathways to avoid abrupt scraping failures.
Rate limiting/geo-blocking
Solution 1: Ensure you use thepremium_proxy parameter to automatically switch IPs.
Solution 2: Use request retry mechanisms, such as exponential backoff delay and retries between failed requests.