Invoice Duplicate Checker
Find duplicate invoices in a list before you pay one of them twice.
Validate invoice JSON: syntax errors located, fields and types checked, and the totals recomputed.
Or drop a JSON file here
The Invoice JSON Validator locates JSON syntax errors to the line and column, recognises the invoice shape and checks its fields and types against a schema, then recomputes every line and total and compares them with what the JSON states.
Invoice JSON fails in three ways, and a normal JSON validator only catches the first. It can be broken JSON — a trailing comma, a single quote, a missing bracket. It can be well-formed but the wrong shape — a quantity sent as the string "2", a date as 18/09/2026, a missing currency. Or it can be perfect JSON whose numbers do not add up, which is the failure that costs money.
This checks all three. Syntax errors are located to the line and column, with what went wrong in plain words and the text around it. The shape is recognised — the category’s own export, a raw invoice document, a Stripe invoice object, or generic JSON with the usual field names — and checked against the invoice JSON Schema where it applies, reporting every field by its path.
Then the arithmetic is redone: each line’s quantity times price, less discount, plus tax, and the subtotal, tax, total and balance due, compared with what the JSON states. The formatted JSON is given back to copy. Nothing is uploaded.
Line, column and the likely cause in plain words.
Every field problem reported by its JSON path.
ToolQivo exports, Stripe invoices and generic JSON.
Stated against calculated, allowing for rounding.
Clean, indented JSON to copy.
An invoice export, an API response or a webhook payload.
The exact position is shown, with the likely cause.
Every problem is listed by its JSON path.
Stated and recomputed figures side by side.
The invoice JSON these tools export, a raw invoice document, a Stripe invoice object, and generic JSON with an items or lines array and familiar field names such as quantity, unit_price and tax_rate.
Because "10" + "5" is "105" in JavaScript and many other languages, not 15. Amounts and quantities should be JSON numbers.
Yes — every line, the subtotal, tax, total and balance due, allowing for rounding to a cent.
No. It is parsed and checked in your browser.
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