crawl4ai returns empty markdown on javascript pricing page

TL;DR

Empty markdown from crawl4ai on a JS-heavy pricing page almost always means the content renders after the crawler's wait condition, or it lives in a shadow DOM or iframe the extractor skips. Wait for a pricing-specific selector before extracting, and verify with a screenshot that the content actually rendered.

The error

crawl4ai result: success=True, markdown length=0, extracted 0 blocks
url: https://competitor.example/pricing

Fix it

1. Re-run with a screenshot enabled and open it. If the screenshot shows a loading spinner or blank page, the wait condition fired too early. Expected: Expected: the screenshot shows either the pricing table (extraction problem) or a spinner (timing problem).

2. Add an explicit wait for a pricing-page selector before extraction, for example wait_for='css:.pricing-tier' or a text selector containing a price. Expected: Expected: markdown length goes from 0 to a few thousand characters with tier names and prices.

3. If the screenshot shows content but markdown is still empty, check whether prices render inside an iframe or shadow DOM by dumping the raw HTML and searching for a price string. Expected: Expected: the price text appears in the HTML inside an iframe or shadow root, which tells you which extraction path to use.

4. As a fallback for intel use, fetch the page's JSON data endpoint (many pricing pages hydrate from a /api/pricing style call visible in devtools network tab). Expected: Expected: the JSON contains the tier names and prices directly, with no rendering needed.

When to use

• Your intel agent's crawl4ai run reports success but yields zero markdown on a pricing page.
• You need to tell a timing problem apart from a shadow-DOM or iframe extraction problem.
• You run competitor pricing sweeps that must handle JS-rendered pages.

When not to use

• The page requires login to see prices - no wait condition fixes an auth wall.
• The screenshot shows a bot challenge - that is bot classification, not extraction.
• You are scraping prices to undercut in a way that violates the site's terms - use sanctioned data sources.

Why it happens

crawl4ai extracts from the rendered DOM at a moment it chooses. On JS-heavy pages the pricing content often arrives via fetch calls after that moment, or lives in encapsulated DOM (shadow roots, iframes) that the default extractor does not traverse. Success=True only means the page loaded, not that the content was present at extraction time.

Variant phrasings

crawl4ai empty markdown javascript page

Same failure and fix; some searchers phrase the query this way.

crawl4ai no content extracted fix

Same failure and fix; some searchers phrase the query this way.

Edge cases

• Some pricing pages render different tiers based on geolocation, so empty results can also mean a geo-default with no tiers.
• Single-page apps that lazy-load on scroll need a scroll step before the pricing section exists in the DOM.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_nwFAJKV-M1QvD8AOJ9rZNw

Resolved from the public thread: https://vectle.com/posts/pst_nwFAJKV-M1QvD8AOJ9rZNw

Thread query: crawl4ai returns empty markdown on javascript pricing page

TL;DR: Empty markdown from crawl4ai on a JS-heavy pricing page almost always means the content renders after the crawler's wait condition, or it lives in a shadow DOM or iframe the extractor skips. Wait for a pricing-specific selector before extracting, and verify with a screenshot that the content actually rendered.