FHIR Validator JS

A Node.js module that wraps the HL7 Java Validator Wrapper, handling installation, version checks, and validation sessions. It ensures an instance of the validator runs while supporting multiple concurrent validation sessions.

This module:

• Ensures the required OpenJDK version is installed (using Adoptium JRE).
• Downloads & runs the latest version of the FHIR Validator CLI JAR.
• Manages validation sessions, allowing different IG contexts & configurations.
• Keeps validation sessions alive to prevent cache reset that impacts performance.

🚀 Features

• ✅ Automatic installation of JDK and Validator JAR
• ✅ Automatic validator-wrapper server startup (only if not already running)
• ✅ Session-based validation (supports multiple configurations)
• ✅ Keep-alive mechanism to maintain active sessions
• ✅ Cross-platform support (Windows, macOS, Linux)

📦 Installation

Install via npm:

npm install fhir-validator-js

🛠 Setup & Usage

1️⃣ Import & Initialize the Validator

const createValidatorInstance = require('fhir-validator-js');

(async () => {
    const validator = await createValidatorInstance({
        sv: "4.0.1",
        igs: ["il.core.fhir.r4#0.16.2"],
        locale: "en"
    });

    const resource = {
        resourceType: "Patient",
        meta: {
            profile: ["http://fhir.health.gov.il/StructureDefinition/il-core-patient"]
        },
        id: "123",
        name: [{ given: ["John"], family: "Doe" }]
    };

    const result = await validator.validate(resource);
    console.log("Validation Result:", JSON.stringify(result, null, 2));

    // Shutdown keep-alive mechanism
    validator.shutdown();
})();

⚙️ Configuration Options

The validator wrapper can be configured via:

• Environment variables
• Constructor options

🌍 Environment Variables

You can define these before running your application:

export FHIR_VALIDATOR_JDK_PATH=/path/to/jdk
export FHIR_VALIDATOR_JAR_PATH=/path/to/validator_cli.jar
export FHIR_VALIDATOR_NO_AUTO_INSTALL=true

📌 Constructor Parameters

const validator = await createValidatorInstance({
    sv: "4.0.1",
    igs: ["il.core.fhir.r4#0.16.2"],
    locale: "en",
    noAutoInstall: false,
    jdkPath: "/custom/jdk/path",
    jarPath: "/custom/jar/path"
});

Options provided as parameters override environment variables.

🔍 License

This project is licensed under the Apache License 2.0.

📜 Dependencies & Their Licenses:

• FHIR Validator (Apache 2.0) - HL7 FHIR Validator
• OpenJDK (GPLv2 + Classpath Exception) - OpenJDK

🤝 Contributing

Pull requests are welcome! If you encounter any issues or have feature requests, feel free to open an issue.