The Tool Desk
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What DocRaptor error 422 means
According to DocRaptor’s HTTP Status Codes documentation, 422 means the input document has syntax errors and DocRaptor cannot process it as expected. The problem to investigate first is therefore the document content DocRaptor received, not a generic network or authentication failure.
Make sure you are diagnosing the status you actually received. DocRaptor assigns different meanings to nearby codes: 400 indicates a bad request, 401 an incorrect API key, and 403 permission problems or too many simultaneous generation requests. Follow those separate paths if the response shows one of those statuses.
Find the error details and exact input
Compare the request payload DocRaptor received with the file or URL content you inspected locally. A browser preview may not represent the exact markup sent for conversion, particularly if the request constructs or transforms the document.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
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- Synchronous generation: DocRaptor’s API overview says a generation error is returned as an XML error message rather than the expected document bytes. Read and preserve that response body.
- Asynchronous generation: Inspect the job’s status response and any validation details. Save those details alongside the exact submitted document so you can reproduce the failure.
When reporting the problem, include the status, returned error details, and the precise input that triggered it. Avoid replacing the returned message with a paraphrase; its specifics can identify which part of the document needs attention.
Diagnose the failure by layer
1. Validate the submitted markup
Because 422 is DocRaptor’s input-syntax status, check the submitted HTML or XML for malformed or incomplete markup and compare it with the version that succeeds in your own tools. If the source is fetched from a URL, verify the content DocRaptor receives there as well.
Rank #2
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2. Check rendering mode when output looks wrong
DocRaptor applies print media by default. If you intended browser-style screen rules, its API documentation identifies selecting print when screen was intended as a common reason for incorrect-looking output. Try prince_options[media] = screen when screen styling is appropriate. This is a layout check, not a general explanation for every 422.
3. Check JavaScript-dependent documents
JavaScript is disabled by default. If the document relies on a framework or script-generated content, enable JavaScript in the conversion settings. For asynchronous rendering, signal completion with docraptorJavaScriptFinished() so conversion waits for the work to finish. DocRaptor’s API documentation describes these settings.
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4. Confirm resource URLs and encoding
Use absolute URLs for stylesheets, fonts, images, and other external resources, or set a base URL so relative references resolve correctly. Specify UTF-8 when the document contains characters that depend on it. For generated charts, disable animation if it prevents the chart from reaching its final rendered state before conversion.
5. Determine whether an asset error is fatal
Remote resources can fail to load because of HTTP errors, DNS failures, unknown MIME types, timeouts, SSL problems, or rejected connections. DocRaptor says resource-download errors are ignored by default in many configurations. They can fail generation when ignore_resource_errors is disabled. Check this setting before treating every missing asset as the cause of a 422.
Rank #4
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Fixes matched to what you observe
| Observation | What to check | Next step |
|---|---|---|
| Confirmed 422 and an input or validation message | The exact submitted HTML/XML or fetched document content | Correct the markup or content indicated by the response, then reproduce using the same input. |
| Generation error instead of PDF bytes | The synchronous XML error response | Read and retain the returned message; do not treat it as a successful PDF response. |
| Asynchronous job fails | Status response and validation details | Use the job’s details to identify the input problem and preserve them for reproduction. |
| PDF styling differs from browser styling | Print versus screen media | Use prince_options[media] = screen only when screen CSS is intended. |
| Script-driven content is absent or incomplete | JavaScript setting and script completion | Enable JavaScript where needed and call docraptorJavaScriptFinished() after asynchronous work completes. |
| External asset cannot be loaded | URL/base URL, encoding, and ignore_resource_errors |
Fix the resource reference or configuration; determine whether resource errors are configured as fatal. |
| Response is 400, 401, or 403 rather than 422 | Actual HTTP status and request details | Follow the status-specific bad-request, API-key, or permission/concurrency diagnosis instead of applying a 422 fix. |
When to contact DocRaptor support
If the response details do not identify the issue, use the Help Request in the DocRaptor dashboard. DocRaptor says this shares the document input, output, and logs with support. Its support page also lists email and live chat. Provide the exact failing input and returned status details so the issue can be investigated against the same conversion.
Or skip the browser setup
If you need a website screenshot rather than a DocRaptor PDF conversion, ScreenshotNeo returns a screenshot or PDF from one GET request. For example, using cURL:
Quick Recap
Best Value
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- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
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ScreenshotNeo API documentation
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