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NusaIndex

Use cases

NusaIndex fits any app that takes in data about people in Indonesia. A few examples.

Public services and local government sites

Sign-up forms that catch a mistyped NIK right away.

  • Check NIK and NIP formats before a form is submitted, so staff do not reject files over typos.
  • Fill province to village dropdowns from the latest Kepmendagri instead of a home-made region table.
  • Old codes from the Papua and North Kalimantan splits resolve to the current codes.

NIKNIPRegion

Schools and universities

Student enrolment with clean NISN, parent NIK and address data.

  • Check student NISN and parent NIK on enrolment forms.
  • Store addresses as region codes so reports per district or regency are easy.

NISNNIKRegion

Fintech, e-commerce and payments

Phone numbers for OTP, bank codes for transfers, amounts on invoices.

  • Normalize phone numbers to E.164 before sending OTPs, and reject prefixes that were never allocated.
  • Look up banks by 3-digit code or BIC for transfer forms.
  • Print amounts as Rp1.500.000,50 and in words for receipts.

PhoneBankRupiah

HR and payroll

Pay dates, collective leave and employee NPWP without manual counting.

  • Count working days and due dates with national holidays and collective leave from the latest SKB.
  • Convert old 15-digit NPWPs to the 16-digit format for tax reports.
  • Read birth date, appointment date and sex from civil servant and PPPK NIPs.

WorkdayHolidayNPWPNIP

Logistics and delivery

Addresses down to village level, delivery estimates and fleet plates.

  • Pick addresses down to village level and search regions by name, such as "gambir".
  • Estimate delivery dates in working days, skipping weekends and holidays.
  • Check fleet plates and find the regencies behind a plate code.

RegionWorkdayPlate

Personal data protection

Keep NIKs and phone numbers out of your logs.

  • Mask NIK, NPWP and phone numbers on admin screens and support tickets.
  • Redact text and objects before they reach logs or observability tools, including through a Go slog handler.

Mask

Testing and QA

Valid test data without copying real customer records.

  • Generate structurally valid NIK, NPWP, phone numbers and plates from a seed.
  • The same seed gives the same values in Go and TypeScript, so fixtures can be shared.
  • Reuse the same checks in Zod, Valibot or go-playground/validator schemas.

FakeSchemas

Chatbots and AI agents

Agents that answer about holidays, regions and amounts without guessing.

  • Add the MCP server so agents answer from data, not from what the model remembers.
  • Every tool is read-only and runs offline on your machine.

HolidayRegionRupiahMCP

© 2026 Haikal Mumtaz