Compare JavaScript scraping APIs on the same permitted pages and required content. A provider list cannot show whether a product table, delayed paragraph or code example survives extraction. Define that expected content before running the tools, then preserve failures as well as successes.
Build a test set that exposes different failure modes
| Owned or permitted case | Expected evidence | What failure means |
|---|---|---|
| Static article | Main paragraph and heading | Extraction or boilerplate problem |
| JavaScript application shell | Required rendered body section | Rendering or readiness gap |
| Table and code | Specified cells and code tokens | Structural loss |
| Delayed element | Content after a bounded wait | Timing/configuration gap |
| Unavailable page | Explicit access or transport error | Failure handling, not empty content |
Make configurations and denominators comparable
Store the tool, mode, wait, proxy, cache choice and access time beside each result. Test the same expected content for every provider. Report how many sources were attempted, accepted, rejected and unavailable; excluding failed sources makes a comparison misleading.
The owned extraction and browser fixtures used for this revision check only their own retained content and stop conditions. They are not a live comparison of commercial scraping APIs. A rendered page that succeeds in one fixture does not establish that every infinite-scroll state is extracted.
Choose from an acceptance record
If required content already exists in source HTML or an authorized data endpoint, test that route before adding browser work. Do not turn access-control failures into an instruction to bypass them.
- Mark required-content failures before comparing output size or duration.
- Record billed operations and selected add-ons for the tested configuration.
- Separate an inaccessible source from a parser that lost accessible text.
- Use current provider documentation for supported operations; measure your own pages for performance.
Reference documentation: www.searchcans.com — /reader-api.
