Free tools
Check the payload. Then get a key.
These tools run in your browser. They do not print a PDF from arbitrary JSON on the server. For a live US Letter file, open the sample or sign in.
- Packing-slip JSON validatorSchema errors that mirror the API body. No login. No server PDF.
- Sample packing-slip JSONCopy-ready payloads: minimal, Northline, tracking, and the invoice twin.
- Packing-slip previewMill-paper HTML of the fields. Optional Shopify-shaped JSON map. Not a PDF.
- CSV to Slipmill JSONMap columns, download a packing-slip payload. The PDF still needs a key.
- Invoice JSON validatorCents helper ($18.00 → 1800). We do not calculate tax.