Data sources
Every dataset lives as a CSV file in data/ with its source documents, regulation, retrieval date, row count and SHA-256 checksum recorded in data/manifest.json. Go embeds the CSV files. TypeScript modules are generated from them at build time, so both libraries always use the same rows.
| Dataset | Rows | Basis |
|---|---|---|
| Regions | 91,599 | Kepmendagri 300.2.2-2138 Tahun 2025 as amended by 300.2.2-2430 Tahun 2025 |
| Historical region codes | 663 | UU 14, 15, 16 and 29 Tahun 2022 (Papua), UU 20 Tahun 2012 and Permendagri 66 Tahun 2011 (Kalimantan Utara) |
| Plate codes | 514 | Perpol 7 Tahun 2021, Korlantas 2024 codes for the new Papua provinces |
| Fixed-line area codes | 387 | Permenkominfo 14 Tahun 2018 |
| Holidays | 194 | SKB 3 Menteri 2020 to 2027 with every amendment, Keppres 22 Tahun 2020, 10 Tahun 2024, 33 Tahun 2024 |
| Banks | 125 | Bank code table published by PT Bank Central Asia Tbk (1 November 2024), not by Bank Indonesia |
Mobile prefixes and the layouts of NIK, NPWP and NIP come from the regulations named on each reference page.
Keeping data current
Section titled “Keeping data current”A watch script compares the data with the official sources and a public reference dataset, and reports changes as a reviewable diff. Every data change is reviewed by a person, passes schema, relation and checksum checks, and bumps the data version (YYYY.MM.N), which is separate from the code version. A regulation change (a new region name, an added holiday) is a patch release, never a breaking change.
Not included
Section titled “Not included”- Postal codes: the only source is a search page without a license or download.
- Bank account number lengths: there is no official source.
License
Section titled “License”Code and data are MIT licensed. NOTICE lists the source and attribution for each dataset. Government regulations are public documents. NusaIndex is not an official publication.
© 2026 Haikal Mumtaz