Japanese corporate & invoice number API

Implements the official check-digit algorithm for Japanese corporate numbers, plus invoice (qualified-invoice issuer) numbers via /api/v1/invoice/validate.

Endpoint

Example

curl "https://formfit.dev/api/v1/corp/validate?number=8000000000001" \
  -H "Authorization: Bearer YOUR_API_KEY"

Response (excerpt)

{"valid":true,"normalized":"8000000000001"}

FAQ

Does it query the NTA registry?

No — check-digit validation only. Pair with the NTA Web-API when you need existence checks.

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