CNJ Case Number Validator (Brazil)

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validate CNJ case number check digit

CNJ unique case number validator (NNNNNNN-DD.AAAA.J.TT.OOOO)

A wrong CNJ number in a filing can delay or block the submission. Check-digit validation (modulo 97, ISO 7064) is the fastest test before sending the document.

How the CNJ case number works

The format is NNNNNNN-DD.AAAA.J.TT.OOOO: 7 case digits, 2 check digits, 4 year, 1 judiciary segment, 2 court, 4 origin.
The check digit is calculated by modulo 97 over NNNNNNN+AAAA+J+TT+OOOO×100. A wrong check digit indicates a typo or invalid number.

When to use this tool

Pre-filing check

Input: 0000001-82.2024.8.26.0100
Expected output: DV válido, segmento Estadual (TJs), tribunal TJSP

Use when copying case numbers from notifications to avoid rework.

Batch validation

Input: Lista de números copiados de planilha
Expected output: Tabela de válidos e inválidos com motivo

Useful in high-volume law firms for data-quality cleanup.

Full tool FAQ

What is the CNJ check digit?

The result of the mod-97 algorithm (same as IBAN) applied to the full number without the DD. Two digits ensure integrity.

What is the exact CNJ format?

What does the J field (branch) mean?

Does a valid number guarantee the case exists?

Can I validate pre-CNJ numbers?

What are the last four digits (OOOO)?

How exactly is the check digit calculated?

Can I validate several numbers at once?

Frequently asked questions

What is the CNJ check digit?

The 2 digits after NNNNNNN (the DD position). Calculated using the modulo-97 algorithm (ISO 7064) to detect typing errors.

Can a number with invalid check digit exist in the system?

Not in systems that validate on entry, but records imported from legacy systems may have incorrect check digits. This tool identifies those cases.

Next steps

When to use this tool

Pre-filing check

Input: 0000001-82.2024.8.26.0100
Expected output: DV válido, segmento Estadual (TJs), tribunal TJSP

Use when copying case numbers from notifications to avoid rework.

Batch validation

Input: Lista de números copiados de planilha
Expected output: Tabela de válidos e inválidos com motivo

Useful in high-volume law firms for data-quality cleanup.

Full tool FAQ

What is the CNJ check digit?

The result of the mod-97 algorithm (same as IBAN) applied to the full number without the DD. Two digits ensure integrity.

What is the exact CNJ format?

What does the J field (branch) mean?

Does a valid number guarantee the case exists?

Can I validate pre-CNJ numbers?

What are the last four digits (OOOO)?

How exactly is the check digit calculated?

Can I validate several numbers at once?

Frequently asked questions

What is the CNJ check digit?

The 2 digits after NNNNNNN (the DD position). Calculated using the modulo-97 algorithm (ISO 7064) to detect typing errors.

Can a number with invalid check digit exist in the system?

Not in systems that validate on entry, but records imported from legacy systems may have incorrect check digits. This tool identifies those cases.