notify.js

var request = require('request');

var json = {
    id: '1',
    jsonrpc: '2.0',
    method: 'GUI.ShowNotification',
    params: {
        title: 'title-test',
        message: 'message-test'
    }
}

request({
    url: 'http://tranquil:3005/jsonrpc',
    method: 'POST',
    json: json
}, function(error, response, body) {
    if (error) {
        console.log(error);
    } else {
        console.log(response.statusCode, body);
    }
});