Type-safe HL7v2 message parsing and validation using Zod v4 schemas.

• Type-safe validation: Full TypeScript support with Zod v4 schemas for all HL7v2 message types
• Multiple HL7 versions: Support for HL7v2 versions, e.g. 2.6 and 2.8
• Comprehensive coverage: Includes all message types, segments, fields, and data types for each version
• Minimum dependencies: Only requires Zod v4 as a peer dependency
• Tree-shakable: Import only the schemas you need with subpath imports
• Zod v4 optimized: Built with the latest Zod v4 features for better performance and TypeScript efficiency
• Optimal performance: Use subpath imports to include only the HL7 version you need

This package requires Zod v4 (minimum version 3.25.0) as a peer dependency.

npm install @rethinkhealth/hl7v2-zod zod@^3.25.0
# or
yarn add @rethinkhealth/hl7v2-zod zod@^3.25.0
# or
pnpm add @rethinkhealth/hl7v2-zod zod@^3.25.0

// Import directly from the specific HL7 version you need
import { adt_a01Schema } from "../dist/2.8";

// Parse and validate an ADT_A01 message
const hl7Message = {
  MSH: {
    "1": "|",
    "2": "",
  },
  // ...
}

try {
  const result = adt_a01Schema.parse(hl7Message)
  console.log('Valid HL7 message:', result)
} catch (error) {
  console.error('Invalid HL7 message:', error)
}

Import directly from the specific HL7:

import { adt_a01Schema, segments } from "../dist/2.8";

const { mshSchema, pidSchema } = segments;

adt_a01Schema.parse({
  MSH: {
    MSH: {
      fieldSeparator: "|",
    },
  },
});

mshSchema.parse({
  "1": "MSH",
  "2": "|",
  // ...   
});

pidSchema.parse({
  "1": "PID",
  // ...
});

• @rethinkhealth/hl7v2-zod/2.6: All HL7v2.6 schemas
• @rethinkhealth/hl7v2-zod/2.8: All HL7v2.8 schemas

Each version export contains:

• Message schemas: All HL7 message type schemas (e.g., ADT_A01, ORU_R01)
• Segment schemas: All HL7 segment schemas (e.g., MSH, PID, PV1)
• Field schemas: All HL7 field schemas
• Data type schemas: All HL7 data type schemas (e.g., AD, CE, CX)
• Metadata: Registry metadata for the version

• Node.js 18+
• pnpm (recommended) or npm
• Zod v4 (^3.25.0)

# Install dependencies
pnpm install

# Build the package
pnpm build

# Run type checking
pnpm type-check

# Run linting
pnpm lint

# Fix linting issues
pnpm lint:fix

# Format code
pnpm format

# Fix formatting issues
pnpm format:fix

# Run all checks (lint + format)
pnpm check

# Fix all issues
pnpm check:fix

# Run tests
pnpm test

src/
├── 2.x/            # HL7v2.x schemas
└── index.ts        # Main entry point (utility functions)

Each version directory contains:

• messages/: Message type schemas
• segments/: Segment schemas
• fields/: Field schemas
• datatypes/: Data type schemas
• registry.ts: HL7 metadata
• index.ts: Version-specific exports

1. Fork the repository
2. Create a feature branch
3. Make your changes
4. Add tests if applicable
5. Run the build and test suite
6. Submit a pull request

MIT License - see LICENSE file for details.

• Issues: GitHub Issues
• Documentation: GitHub Wiki

• Zod v4 - TypeScript-first schema validation with improved performance
• HL7 FHIR - Modern healthcare data standard