playground.mris.dev Catalog

prototype / May 2026

Coretax Renamer

Faktur Pajak PDFs exported from Coretax have opaque filenames that are hard to reference.

Live demo Source
Why I built it

Needed to quickly identify invoices by buyer name and number without opening each PDF.

What it does

A PWA to batch-rename Coretax Faktur Pajak PDFs by extracting buyer name, invoice reference, and faktur kode from the PDF text layer.

Tech used
  • PWA
  • JavaScript (ESM)
  • PDF.js
  • nginx

Batch-rename Faktur Pajak PDFs with configurable filename templates and delimiters.

Features

  • Client-side only - all processing happens in your browser
  • Offline support - works without internet after first load (Service Worker caches pdf.js)
  • Configurable delimiter - choose space, underscore, hyphen, dot, or custom separator
  • Custom filename template - {invoice}{d}{name}{d}{kode} (delimiter {d})
  • Drag & drop or file browse
  • Batch download renamed PDFs
  • Collision handling - auto-appends (2), (3) for duplicate names

How it works

  1. Drop Coretax-exported Faktur Pajak PDFs onto the window, or click Browse PDFs
  2. The app parses each PDF and extracts:
    • Buyer name (from “Pembeli” block)
    • Invoice reference (from “Referensi:” line)
    • Kode dan Nomor Seri Faktur Pajak
  3. Proposes new filename using configurable template
  4. Click Apply to download all renamed PDFs

Usage

# Clone and build
git clone git@github.com:ilmimris/coretax-renamer-web.git
cd coretax-renamer-web
podman build -t ghcr.io/ilmimris/coretax-renamer-web:latest .

Deployed to k3s cluster with ingress at coretax.mris.dev.

Notes

  • Uses PDF.js from CDN (cached for offline)
  • Target audience: SiCepat Ekspres internal teams
  • Built as a lightweight client-side alternative to the Rust desktop version