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http-mllp gateway for Node.js

This is a fork of the mllp project with the simple addition of an Express HTTP listner to forward requests to an MLLP endpoint for HL7 v2.x messaging. Ideally this would use the Serverless framework to deploy to AWS Lambda but currently Lambda only supports HTTP.

This gateway can be used with hapi-serverless to send and receive HL7 v2.x messages in JSON from a serverless microservices architecture.

A simple MLLP HL7 V2.x ACK response server is available for testing, more information here.

Changes from the original mllp project:

Path Description
./gateway.js Express HTTP server and request forwarder
./test/gateway-functional Simple functional test using bash script with curl and diff er7 file
index.js //.split('\r')[1] is commented-out to return the full message

Overview

When a HTTP POST request is received containing a Forward-To header the body is sent to the header value address using MLLPServer().send(). The HTTP response contains 2 values in JSON format:

  • er7 - used for the response received from the MLLP send
  • error - null or error message

Example

Request

(See test/gateway-functional/cerner_ORU_R01.er7)

curl -X POST -H \"Content-Type: text/plain\" -H \"Forward-To: mllp://ack.whitebrick.com:2575\" --data-binary @./cerner_ORU_R01.er7 $ENDPOINT
Response
{"er7":"MSH|^~\\&|VISN_OUT^VISN_OUT^L|VISN_OUT^VISN_OUT^L|HealthSentry^HealthSentry^L|Baseline West MC^33D1234567^L|20220511203003848+0000||ACK^R01^ORU_R01|201010010913000772A|P|2.5.1|||||||||PHLabReport-NoAck^^2.16.840.1.114222.4.10.3^ISOMSA|AA|201010010913000772\r\r"}

Running Locally

git clone https://github.com/whitebrick/http-mllp-node
cd http-mllp-node
vi .env # to change server host/port
npm i
node gateway.js

Contributing

  • Questions, comments, suggestions and contributions welcome - contact: hello at whitebrick dot com