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Independent preflight software. Not affiliated with or endorsed by Amazon.
Shipment Sentry
Check a shipment

Free tool · rule pack 2026.07.16

Preflight an Amazon 856 or shipment JSON.

Paste or upload. Get exact segment/field findings with sources. Anonymous documents are never retained.

SUPPORTEDX12 856 / delimiter-driven
SP-API Vendor Shipments JSON
0 bytes
01

Your report appears here.

Start with a sample if you want to see the output before using a live document.

  • ✓ Exact segment or JSON pointer
  • ✓ Evidence class and source link
  • ✓ Concrete remediation
  • ✓ Versioned rule pack

Validation reduces preventable defects; it cannot guarantee Amazon acceptance. Current Vendor Central requirements remain controlling.

Amazon current

Public business requirements

Rules supported by the current public tutorial or API model.

X12 / GS1

Deterministic structure

Envelope controls, hierarchy parentage and check-digit math.

Account-specific

Warnings, not invented certainty

Anything that still needs your Vendor Central guide is labelled plainly.