SellerFlow Feed Workbench

Local JSON feed validation for Walmart Marketplace sellers. Independent tool, not affiliated with Walmart.

Stop guessing why Walmart rejected your feed. SellerFlow Feed Workbench validates your Walmart Marketplace item feeds against your own Walmart item-spec schema — right in your browser, before you upload. Catch the missing required attributes, wrong data types, invalid enums, GTIN/UPC check-digit errors, duplicate SKUs, and product-type mismatches that get feeds rejected, and fix them in minutes instead of guessing through repeated submission cycles. WHY SELLERFLOW • Validate against the real schema — not a guess. Import the item-spec file you already get from the Walmart Developer Portal, and SellerFlow checks required fields, data types, enums, conditionals, lengths, ranges, and formats for each product type. • No manual product-type wrangling. SellerFlow indexes your schema and automatically matches every item in your payload to its product type. You don't split your feed by product type or dig through a massive spec by hand — point it at your payload and go. • Find and fix issues before Walmart does. You get clear, itemized errors with the exact location of each problem, plus safe, preview-before-apply auto-fixes that never touch identity or compliance fields — so you upload clean and skip the rejection loops. • Nothing leaves your browser. Your feed payloads and schema files are processed entirely on your device. Nothing is uploaded, no Walmart credentials are ever requested, and SellerFlow never submits feeds to Walmart on your behalf. • Built for real catalogs. Validate many payload files at once, export results to CSV or JSON, keep a local history to re-open and compare, diff schema versions, and check your imported schemas against Walmart's current recommended versions. WHAT YOU GET Free - JSON syntax validation, with one-click pretty-print and minify - Walmart feed structure checks (header, item array, Orderable/Visible, product-type matching) - Identifier validation: GTIN/UPC/EAN check digits, duplicate SKU and product-ID detection - Local schema import & indexing: import your own Walmart item-spec files, indexed per product type, and matched against your payload — with schema-based error and warning counts Pro - Full schema-based validation detail: see exactly what's wrong — the specific missing required fields, invalid values, wrong types, and format errors per product type (Free shows the counts; Pro shows the detail) - Walmart version checks and schema version diff - Safe auto-fixes (conservative, preview before apply) - Batch validation across many payloads at once - CSV & JSON export - Validation history - Maintenance payload generator (MP_MAINTENANCE skeletons from a schema + SKU list) Try Pro free for 7 days — no credit card required. You are not paying for Walmart schema files. Pro unlocks SellerFlow's local validation engine, indexing, and workflow features. SellerFlow is an independent tool and is not affiliated with, endorsed by, sponsored by, or operated by Walmart Inc. Walmart, Walmart Marketplace, and related marks are trademarks of Walmart Inc. Validation results depend on the schema version you import and do not guarantee Walmart feed approval. Support: lifeflowtools@proton.me