HL7v2 Message Diff

What is the HL7 Message Diff Tool?

The HL7 Message Diff tool compares two HL7v2 messages side-by-side with field-level change detection. Paste a “before” and “after” message to instantly see which segments were added, removed, or modified — with changes highlighted down to the component level.

Common Use Cases

• Compare messages before and after an interface engine transformation
• Verify that a code change didn't break existing HL7 output
• Debug discrepancies between what was sent and what was received
• Review message changes across HL7 version upgrades
• QA regression testing for integration engine routes

How It Works

The diff engine parses both messages into their segment/field/component structure, then performs a structural comparison. This means it understands HL7 semantics — it won't flag two equivalent messages with different whitespace as different, and it can identify field-level changes within a segment rather than showing the entire segment as changed.

Enforce Consistency with Specs

If you're tired of manually diffing messages to check conformance, automate it with Conformance Specs. Define your interface rules once, then validate any message against the spec programmatically via a REST API.