How to validate EDIFACT messages in TypeScript? (syntax, structure, mandatory segments)

[hello-ediflow]

I'm building an EDI gateway and need to validate incoming EDIFACT messages before processing. I need:

• Syntax validation (correct delimiters, segment format)
• Structure validation (mandatory/conditional segments in correct order)
• Business validation (required fields present)
• Clear error messages with segment positions

[hello-ediflow]

EDIFlow provides 3-phase validation out of the box:

npm install @ediflow/edifact @ediflow/edifact-d96a

import { EdifactValidationServiceBuilder } from '@ediflow/edifact';

const validator = EdifactValidationServiceBuilder.forEDIFACT();
const result = validator.validate(parsedMessage);

if (result.isValid) {
  console.log('✅ Message is valid!');
} else {
  for (const error of result.errors) {
    console.error(`❌ ${error.code}: ${error.message}`);
    // e.g. "STRUCT_001: Mandatory segment BGM missing at position 2"
  }
}

The validation runs three phases:

1. Syntax — delimiter consistency, segment termination
2. Structure — segment order, mandatory/conditional rules per message type
3. Business — mandatory elements, code list values, data types

Works with all supported standards (EDIFACT D.96A–D.20B, EANCOM, X12).