Justice Data NZ

Justice Data NZ

Goal

Query official Ministry of Justice public data tables through a deterministic CLI with human-readable and JSON output.

Use this when

• A user asks for New Zealand court charges, conviction, sentencing, family-violence, or youth-justice statistics
• A workflow needs a current Ministry of Justice data-table workbook URL
• Another tool or agent needs machine-readable rows for a given table year
• A user needs to cite the MoJ data-tables source rather than one-off PDF summaries

Do not use this for

• Police-recorded victimisations, proceedings, or calls-for-service data
• Corrections prison muster, remand, parole, or sentence-management data
• Stats NZ table-builder extraction unless the user specifically asks for Stats NZ mirrors
• Private court data, suppressed case details, or authenticated Ministry systems

Preferred workflow

1. Run scripts/cli.py tables --json to discover the current Ministry of Justice workbook URLs
2. Use convictions --year YYYY for people convicted plus finalised and convicted charges by offence
3. Use sentencing --year YYYY for sentencing outcomes for people and convicted charges
4. Use family-violence --year YYYY for family-violence offence counts, outcomes, convictions, and sentences
5. Use youth --year YYYY for children and young people statistics; add --scope youth-court for Youth Court-only data
6. Use --json when another tool or agent needs machine-readable output
7. Mention the Ministry of Justice as the upstream source and include the workbook URL when reporting figures

CLI

Run with:

python3 skills/justice-data-nz/scripts/cli.py <command> [flags]

Commands:

• tables [--query TEXT] [--limit N] [--json] - list available MoJ data-table workbooks
• convictions --year YYYY [--offence TEXT] [--json] - people convicted, finalised charges, and convicted charges by offence
• sentencing --year YYYY [--json] - people convicted and convicted charges by most serious sentence
• family-violence --year YYYY [--offence TEXT] [--json] - family-violence offence, outcome, conviction, and sentence series
• youth --year YYYY [--scope any-court|youth-court] [--age-group TEXT|all] [--offence TEXT] [--json] - youth justice charge, people, offence, and order series

Examples:

python3 skills/justice-data-nz/scripts/cli.py tables --json
python3 skills/justice-data-nz/scripts/cli.py convictions --year 2025 --offence assault --json
python3 skills/justice-data-nz/scripts/cli.py sentencing --year 2025
python3 skills/justice-data-nz/scripts/cli.py family-violence --year 2025 --json
python3 skills/justice-data-nz/scripts/cli.py youth --year 2025 --scope youth-court --json

Resources

• CLI entrypoint: scripts/cli.py
• Smoke test: scripts/smoke_test.py
• Source and fallback notes: references/api-notes.md

Notes

• The CLI uses public, no-key Ministry of Justice workbook downloads linked from the data-tables page
• Workbooks are parsed with Python standard-library zipfile and XML tools; no external packages are required
• tables can fall back to data.govt.nz CKAN metadata if the MoJ page is blocked, but current values require the direct MoJ workbook downloads
• Every network call has a timeout and upstream failures are reported as clear user-facing errors