This is an example of an External Data Service Implementation for IBM Content Navigator using Node.js

choicelist-example.js

var genders = choicelist.create("Genders");
choicelist.addChoice(genders, "Female");
choicelist.addChoice(genders, "Male");

var otherGenders = choicelist.addCategory(genders, "Other");

choicelist.addChoices(otherGenders, ["Polygender", "Cisgender", "Pangender", "Gender neutral"] ); // I know there are more...
property.choiceList = genders;

nodecn.js

var express = require('express')
	, bodyParser = require('body-parser')
	, _= require("underscore")
	, http = require('http')
	, morgan = require('morgan');
    
var jsonParser = bodyParser.json();

var app = express();
app.use(morgan("dev")); // Change this for production code
app.set('port', process.env.PORT || 3000);

app.post('/type/:objectType', jsonParser, function(req, res) {

	console.log(req.body); // Remove this for production code
	
	var dataResponse = {
		"externalDataIdentifier": "Node EDS",
		"properties" : [ ]
	};

	// Add your implementation code here
	
	console.log(dataResponse);  // Remove this for production code
	res.json(dataResponse);	
});

function getProperty(req, name) {
	return _.findWhere(req.body.properties, {"symbolicName" : name} );
}

// This function is specific for Content Navigator, the rest of the file is the same as Case Manager.

app.get('/types', function(req, res) {
	var types = ["TST_testDocType", "Email"];
	res.json(types.map( value => { return {symbolicName: value} } ) );
});

http.createServer(app).listen(app.get('port'), function(){
	console.log('Node EDS server listening on port ' + app.get('port'));
});