Nihon Kojin Bango View

NihonKojinBangoView is a headless read-only display of Japan's Individual Number / My Number (マイナンバー), Japan's government-issued personal identifier. It renders as a <span> with an accessible label. It is the read-only companion to NihonKojinBangoInput.

Status: beta — implemented and unit-tested in all seven frameworks; not yet exercised in a composed flow.

Implementation Notes

• Renders as <span>
• Format: Twelve digits, issued to every resident of Japan since 2016. The twelfth digit is a check digit: the first eleven digits are each multiplied by a position-dependent weight (6,5,4,3,2 for positions 1-5; 7,6,5,4,3,2 for positions 6-11), summed, taken Modulus-11, and the remainder subtracted from 11 (remainders of 0 or 1 both yield a check digit of 0).
• Provides accessible name via the label prop
• Companion to NihonKojinBangoInput

Props

• value: string (default: "") — the identifier to display
• label: string (required) — accessible label via aria-label
• ...restProps: any — additional HTML attributes spread onto the <span>

Usage

<SummaryList>
  <SummaryListItem term="Individual Number / My Number (マイナンバー)">
    <NihonKojinBangoView label="Individual Number / My Number (マイナンバー)" value={value} />
  </SummaryListItem>
</SummaryList>

ARIA

• aria-label={label} — provides the accessible name

When to Use

• Use to display a stored Japan Individual Number / My Number (マイナンバー) read-only.
• Use in summary lists, patient records, audit logs, or detail views.
• Use when the identifier should not be editable in the current context.

When Not to Use

• Do not use for editing identifiers — use nihon-kojin-bango-input instead.
• Do not use for general text display — use a <span> directly.
• Do not use for other countries' identifiers — use the corresponding country-specific view.

Headless

This headless component ships zero CSS. The consumer provides all styling targeting the .nihon-kojin-bango-view class hook.

Testing

• Verify renders a <span> with the correct class
• Verify the value prop is rendered as text content
• Verify aria-label is set from the label prop

Domain Knowledge

Twelve digits, issued to every resident of Japan since 2016. The twelfth digit is a check digit: the first eleven digits are each multiplied by a position-dependent weight (6,5,4,3,2 for positions 1-5; 7,6,5,4,3,2 for positions 6-11), summed, taken Modulus-11, and the remainder subtracted from 11 (remainders of 0 or 1 both yield a check digit of 0).

Where to find it: Printed on the Individual Number Card (マイナンバーカード) and the paper Notification Card, and required when enrolling in Japan's National Health Insurance (国民健康保険).

Related components

• nihon-kojin-bango-input — an input for entering Japan's Individual Number / My Number (マイナンバー)
• summary-list-item — one key-value pair in a summary list

References

• Wikipedia: Individual Number

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