Actual deterministic evidence
Duplicate Shopify CSV header
Two columns use the same header name. Duplicate names make field mapping ambiguous.
Minimal synthetic input
URL handle,Title,Title,Price
dupe,Product,Product 2,10.00
Actual Q-Surface result
| Issue code | Severity | Message | Row | Field |
|---|---|---|---|---|
DUPLICATE_HEADER | critical | Duplicate header: Title | — | Title |
Repair, unresolved work, and rerun
No deterministic safe fix changed this CSV; edit the original sample manually.
DUPLICATE_HEADER: Remove or rename duplicate headers.
Next: Remove or rename duplicate headers. Rerun the edited CSV through Q-Surface before attempting import.
Processing boundary and limitations
Your CSV is processed in your browser. No Shopify login. No store connection. No CSV storage.
- Q-Surface cannot decide which duplicate column the author intended to keep.
- Q-Surface does not guarantee Shopify import success and is not affiliated with Shopify.
Source classification: quality_check. Represented Q-Surface version: 0.7.31.
Related evidence
Try the evidence, then check your own file
Check my own CSV with this mode and source context
The synthetic result demonstrates this public case only. It does not imply that your own CSV has the same defect. The founding passage is self-serve, browser-local, and requires no contact or file sharing.