emvco-qr-sdk

A robust, zero-dependency TypeScript SDK to decode, validate, and map EMVCo-compliant QR codes for digital payment systems.

emvco-qr-sdk provides a full-featured, extensible parser for QR codes that follow the EMVCo Merchant Presented Mode format.
It is cross-platform, with support for Node.js and browser environments, and does not rely on any external dependencies.

✨ Features

• 🧠 EMVCo TLV Parsing Engine
  Decode raw QR strings using the official Tag-Length-Value format defined by the EMVCo specification.

• 🔀 Nested Tag Support
  Automatically parses and reconstructs deeply nested TLV structures, commonly found in interoperable payment systems.

• 🌍 Regional Mapping Strategies
  Supports both standard global mappings and region-specific mappings like Colombia (EASPBV), returning human-readable field names for better integration.

• 🏷️ Multiple Output Modes
  Choose from:

  • TLV: Raw parsed tag entities (TlvEntity[])
  • RAW_OBJECT: Raw key/value object by tag
  • GLOBAL or CO: Named object output with optional subtag resolution

• ✅ CRC-16/CCITT-FALSE Checksum Validation
  Built-in cyclic redundancy check to ensure QR string integrity, following EMVCo guidelines.

• 🔍 Validation Utilities
  Validate QR format, structure, and checksum before processing. Ensures reliable QR handling in secure applications.

• 📦 Zero Dependencies & Tree-shakeable
  No external libraries required. Fully optimized for bundlers like Webpack, Vite, or Rollup.

• 🌐 Cross-platform Compatibility
  Runs seamlessly in:

  • Web Browsers
  • Node.js
  • React Native
  • Serverless environments

• 🧪 100% TypeScript & Fully Tested
  Strong typings for auto-completion and refactoring. Built with modern TypeScript and tested with Jest.

📦 Installation

npm install emvco-qr-sdk
# or
yarn add emvco-qr-sdk

🚀 Usage Examples

✅ 1. TLV Mode – Return Raw TLV Entities

import { parseQR, QRParseMode } from 'emvco-qr-sdk';

const tlvs = parseQR(rawQR, { parseMode: QRParseMode.TLV });

console.log(tlvs);

Returns:

[
  { "tag": "00", "value": "01", "length": 2 },
  { "tag": "53", "value": "170", "length": 3 },
  { "tag": "54", "value": "100.53", "length": 6 },
  { "tag": "59", "value": "Fulano de Tal", "length": 13 },
  { "tag": "60", "value": "BOGOTA", "length": 6 },
  { "tag": "63", "value": "CADC", "length": 4 }
]

📦 2. RAW_OBJECT Mode – Flat Raw Tags with Optional Nested Subtags

const raw = parseQR(rawQR, { parseMode: QRParseMode.RAW_OBJECT });

console.log(raw);

Returns:

{
  "00": "01",
  "53": "170",
  "54": "100.53",
  "59": "Fulano de Tal",
  "60": "BOGOTA",
  "63": "CADC",
  "80": {
    "00": "CO.COM.CRB.CANAL",
    "01": "POS"
  },
  "90": {
    "00": "CO.COM.CRB.TRXID",
    "01": "a1777581-6d1a-4b60-b3a9-b695f3562c55"
  }
}

🌍 3. GLOBAL Mode – Named Fields Based on EMVCo Standards

const global = parseQR(rawQR, { parseMode: QRParseMode.GLOBAL });

console.log(global);

Returns:

{
  "payloadFormatIndicator": "01",
  "transactionCurrency": "170",
  "transactionAmount": "100.53",
  "merchantName": "Fulano de Tal",
  "merchantCity": "BOGOTA",
  "crc": "CADC",
  "channel": {
    "00": "CO.COM.CRB.CANAL",
    "01": "POS"
  },
  "transactionId": {
    "00": "CO.COM.CRB.TRXID",
    "01": "a1777581-6d1a-4b60-b3a9-b695f3562c55"
  }
}

🇨🇴 4. CO Mode – Colombian EASPBV Enhanced Mapping

import { parseQR, QRParseMode } from 'emvco-qr-sdk';

const parsed = parseQR(rawQR, { parseMode: QRParseMode.CO });

console.log(parsed);

Returns:

{
  payloadFormatIndicator: "01",
  pointOfInitiationMethod: "12",
  merchantAccountInfo: {
    gui: "CO.COM.CRB.LLA",
    rawType: "02",
    type: "MOBILE_NUMBER",
    value: "3191231234"
  },
  transactionCurrency: "170",
  transactionAmount: "100.53",
  merchantName: "Fulano de Tal",
  merchantCity: "BOGOTA",
  channel: {
    gui: "CO.COM.CRB.CANAL",
    channel: "POS"
  },
  transactionId: {
    gui: "CO.COM.CRB.TRXID",
    transactionId: "a1777581-6d1a-4b60-b3a9-b695f3562c55"
  },
  securityField: {
    gui: "CO.COM.CRB.SEC",
    securityHash: "caf0f93160949f2c96d7f0ed4473eab8ba53fadf9cd29bc518507fe879266145"
  },
  vatValue: {
    gui: "CO.COM.CRB.IVA",
    vatValueOrPercentage: "10.00"
  },
  vatBase: {
    gui: "CO.COM.CRB.BASE",
    vatBaseValue: "1000.00"
  },
  incCondition: {
    gui: "CO.COM.CRB.CINC",
    incCondition: "02"
  },
  incValue: {
    gui: "CO.COM.CRB.INC",
    incValueOrPercentage: "50.00"
  },
  discountField: {
    gui: "CO.COM.CRB.DESC",
    discountIndicator: "01",
    discountConsultation: "00"
  },
  crc: "CADC"
}

🧩 This mode uses Colombia's extended EMVCo specification (EASPBV) to map structured information such as:

• 🔑 merchantAccountInfo: the interoperable key used (cell phone, email, NIT, etc.)
• 🧾 vatValue, vatCondition, vatBase
• 📌 channel, transactionId, securityField
• 💸 discountField with breakdowns
• 🏷️ Each field includes internal identifiers like gui and type to help systems interpret the format

🧠 This is ideal for any payment app, merchant system, or validator working with the Colombian QR regulation EASPBV.

🧹5. Full Parsing with parseFullQR

This method returns a full structured object including:

• named: A mapped object with field names (standard or Colombian).
• raw: The raw object preserving tag codes.
• tlvs: The full array of parsed TLV entities.
• crc: Validates the checksum.
• meta: Metadata about format, version, and region.

import { parseFullQR, QRParseMode } from 'emvco-qr-sdk';

const rawQR = '00020101021226360014CO.COM.CRB.LLA0210319123123453021705406100.535902Fulano de Tal6006BOGOTA800016CO.COM.CRB.CANAL0103POS900016CO.COM.CRB.TRXID0136a1777581-6d1a-4b60-b3a9-b695f3562c556304CADC';

const result = parseFullQR(rawQR, { parseMode: QRParseMode.CO });

console.log(result);

Returns:

{
  named: {
    payloadFormatIndicator: "01",
    pointOfInitiationMethod: "12",
    merchantAccountInfo: {
      gui: "CO.COM.CRB.LLA",
      rawType: "02",
      type: "MOBILE_NUMBER",
      value: "3191231234"
    },
    transactionCurrency: "170",
    transactionAmount: "100.53",
    merchantName: "Fulano de Tal",
    merchantCity: "BOGOTA",
    channel: {
      gui: "CO.COM.CRB.CANAL",
      channel: "POS"
    },
    transactionId: {
      gui: "CO.COM.CRB.TRXID",
      transactionId: "a1777581-6d1a-4b60-b3a9-b695f3562c55"
    },
    crc: "CADC"
  },
  raw: {
    "00": "01",
    "01": "12",
    "26": {
      "00": "CO.COM.CRB.LLA",
      "02": "3191231234"
    },
    "53": "170",
    "54": "100.53",
    "59": "Fulano de Tal",
    "60": "BOGOTA",
    "80": {
      "00": "CO.COM.CRB.CANAL",
      "01": "POS"
    },
    "90": {
      "00": "CO.COM.CRB.TRXID",
      "01": "a1777581-6d1a-4b60-b3a9-b695f3562c55"
    },
    "63": "CADC"
  },
  tlvs: [
    // Array of parsed TlvEntity instances
  ],
  crc: {
    value: "CADC",
    isValid: true
  },
  meta: {
    format: "EMVCO",
    version: "01",
    region: "CO"
  }
}

🧾 Change Log

You can find the changelog in the Releases section.
We follow Semantic Versioning.

📘 References

• EMV® QR Code Specification – Merchant-Presented Mode v1.1
• EASPBV Colombia 2024 TLV Specification
• CRC-16/CCITT-FALSE

📄 License

Licensed under the ISC License.