POST /api/diff
Compare two messages and return field-level differences. Public — no authentication required.Request Body
| Field | Type | Default | Description |
|---|---|---|---|
leftMessage | string | Required | Baseline message |
rightMessage | string | Required | Comparison message |
standard | string | Auto-detect | hl7, fhir, ncpdp |
ignoredFields | string[] | [] | Fields to exclude (e.g., ["PID.3", "MSH.10"]) |
Example
curl
curl -X POST http://localhost:5101/api/diff \
-H "Content-Type: application/json" \
-d '{
"leftMessage": "MSH|^~\\&|SENDER|FAC|RECV|DEST|20260222||ADT^A01|12345|P|2.3\rPID|1||MRN001^^^MRN||DOE^JOHN||19800101|M",
"rightMessage": "MSH|^~\\&|SENDER|FAC|RECV|DEST|20260222||ADT^A01|12345|P|2.3\rPID|1||MRN001^^^MRN||DOE^JANE||19800101|F",
"standard": "hl7",
"ignoredFields": ["MSH.10"]
}'
Response
{
"success": true,
"data": {
"differences": [
{
"field": "PID.5.1",
"leftValue": "JOHN",
"rightValue": "JANE",
"changeType": "modified"
},
{
"field": "PID.8",
"leftValue": "M",
"rightValue": "F",
"changeType": "modified"
}
],
"totalDifferences": 2,
"ignoredFields": ["MSH.10"]
},
"error": null
}