HL7 Tools — MCP Server + REST API

HL7 v2.x parser, viewer, validator, test message generator, and FHIR R4 converter.

Features

• Parse raw HL7 v2 pipe-delimited messages into structured JSON with named fields
• Explain messages with human-readable field descriptions (CARISTIX-style)
• Validate messages against segment/field requirements for 20+ message types
• Generate realistic test messages for ADT, ORM, ORU, SIU, MDM, DFT, VXU
• Diff two HL7 messages to find field-level differences
• Convert HL7 v2 to FHIR R4 Bundles (10 resource mappings)
• Convert FHIR R4 Bundles back to HL7 v2
• Look up any segment or field definition across versions 2.3–2.8

Supported Segments (20 with full definitions)

MSH, EVN, PID, PD1, NK1, PV1, PV2, IN1, GT1, DG1, ORC, OBR, OBX, AL1, SCH, NTE, FT1, PR1, RXA, RXE

Quick Start

npm install
npm run dev       # HTTP mode on port 3200
npm start         # stdio mode (for MCP clients)

MCP Tools

| Tool | Description | |------|-------------| | hl7_parse | Parse HL7 v2 message to structured JSON | | hl7_explain | Human-readable explanation of every field | | hl7_validate | Validate message structure and required fields | | hl7_generate | Generate sample messages with fake data | | hl7_diff | Compare two messages field by field | | hl7_to_fhir | Convert HL7 v2 to FHIR R4 Bundle | | fhir_to_hl7 | Convert FHIR R4 Bundle to HL7 v2 | | hl7_segments | List all segments and field counts | | hl7_field_info | Look up a specific field definition |

REST API

POST /parse       — Parse a message
POST /explain     — Explain a message
POST /validate    — Validate a message
POST /generate    — Generate a test message
POST /diff        — Diff two messages
POST /to-fhir     — Convert HL7 to FHIR
POST /to-hl7      — Convert FHIR to HL7
GET  /segments    — List segments (?version=2.5.1)
GET  /field       — Field info (?segment=PID&field=3)
GET  /health      — Health check
GET  /            — API info