Zentris Billing

Modern TypeScript billing & invoice generation library for Angular, React, Vue, Node.js and JavaScript applications.

Generate professional invoices in:

HTML
PDF
CSV
JSON

Supports GST invoices, tax calculation, discounts, payment tracking, invoice templates and multi-framework integration.

Features

TypeScript-first architecture
Framework independent
GST & tax calculation utilities
Invoice summary calculations
Professional HTML invoice templates
PDF invoice generation using Puppeteer
CSV & JSON export support
Multi-payment transaction support
Currency formatting
Custom branding & themes
Lightweight API
ESM + CommonJS support

Installation

npm install @awadheshs109/billing

Quick Example

import {
  InvoiceGenerator
} from "@awadheshs109/billing";

const invoice = {
  invoiceNo: "INV-1001",

  date: "25-05-2026",

  currency: "INR",

  company: {
    name: "Zentris Pvt Ltd",
    address: "Mumbai, India",
    phone: "+91 9999999999"
  },

  customer: {
    name: "Rahul Verma",
    email: "rahul@example.com"
  },

  items: [
    {
      description: "Angular Dashboard",
      quantity: 2,
      rate: 12000
    }
  ],

  tax: 18,
  discount: 5
};

const html =
  InvoiceGenerator.toHTML(invoice);

console.log(html);

Generate PDF

import fs from "node:fs";

const pdf =
  await InvoiceGenerator.toPDF(invoice);

fs.writeFileSync(
  "invoice.pdf",
  pdf
);

Generate GST Invoice Template

const html =
  InvoiceGenerator.toHTML(
    invoice,
    {
      template: "gst"
    }
  );

Export Formats

HTML

InvoiceGenerator.toHTML(invoice);

PDF

await InvoiceGenerator.toPDF(invoice);

CSV

InvoiceGenerator.toCSV(invoice);

JSON

InvoiceGenerator.toJSON(invoice);

Tax Utilities

import {
  Billing
} from "@awadheshs109/billing";

const gst =
  Billing.calculateGST(
    1000,
    18
  );

console.log(gst);

Currency Formatting

Billing.formatCurrency(
  15000,
  "INR"
);

Supported Frameworks

Angular
React
Vue
Next.js
Node.js
Express
NestJS
Vanilla JavaScript

Invoice Templates

Classic Template

Professional clean invoice layout.

GST Template

Indian GST-compliant invoice design.

Package Exports

import {
  InvoiceGenerator,
  Billing,
  TAX_RATES,
  VERSION
} from "@awadheshs109/billing";

Version

console.log(VERSION);

Roadmap

QR payment generation
Razorpay integration
UPI invoice QR
Multi-language invoice support
Thermal receipt template
Email invoice sender
React invoice viewer
Angular invoice component

License

MIT

Repository

GitHub: https://github.com/Awadheshs109/zentris-billing

npm: https://www.npmjs.com/package/@awadheshs109/billing