Overview

Amazon’s Listings Items API (version 2021‑08‑01) now includes a validation‑preview mode. By adding the query string mode=VALIDATION_PREVIEW to a PUT or PATCH call, sellers can run the full set of catalog checks without actually updating any product data. This feature helps sellers identify blocking errors before committing changes, cutting down on repeated failed uploads.

Key Points

• New query flag — Supplying mode=VALIDATION_PREVIEW to putListingsItem or patchListingsItem triggers a dry‑run that returns the same error objects as a live submission.
• No data written — The service evaluates the payload, reports any problems, and then discards the information, leaving the existing catalog untouched.
• Complete error list — Sellers receive every validation issue that would appear in production, from missing required attributes to policy violations.
• Identical response shape — The preview response uses the standard error schema, so existing error‑handling logic can be reused unchanged.
• Bulk‑friendly — When incorporated into batch scripts, the preview can flag problematic SKUs before a large upload, preserving API quota and reducing rework.
• Instant feedback — Errors are returned in the same request‑response cycle, enabling real‑time diagnostics in UI tools or automation pipelines.
• Works for creates and updates — The preview operates the same way for new ASIN creation (PUT) and existing listing modifications (PATCH).

How Validation Preview Works

1. Build the normal request — Assemble a standard PUT /listings/2021-08-01/items/{sellerId}/{sku} or PATCH payload with all required fields such as title, price, and product type. Example: a seller preparing a new sneaker listing includes size, color, and material attributes.