Hi Mike,

This should be easy enough to do.

You need to have a custom publish event, check if the node is a doc type you're interested in and then call a helper utility to write out the JSON.

Subscribing to events is covered here: https://our.umbraco.org/Documentation/Getting-Started/Code/Subscribing-To-Events/ https://umbraco.tv/videos/umbraco-v7/developer/extending/events/

I'd use the UmbracoHelper to get the content in a structure and then writing out as a json file should be a trivial job.

HTH

Steve

Are you writing out a number of nodes or just the one that's changed?

If you're just doing the current node then use the IContent - I would create a custom model to represent your json so you can create the object (or list / array of objects) and then simply write this out as JSON.

If you have a lot of nodes you have to query and then write back out then you'll want to use the UmbracoHelper so you're using the cache. If it's just a few nodes then you might just be able to use the ContentService - just beware this hits the DB.

Either way - be careful if you use the cache, it might not have been updated on the publish even if you hook into the wrong event!!

To get the property values from IContent use something like:

namespace My.Namespace
{
    public class RegisterUmbracoEvents : ApplicationEventHandler
    {

        protected override void ApplicationStarted(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
        {
            ContentService.Published += ContentServicePublished;
        }

        private void ContentServicePublished(IPublishingStrategy sender, PublishEventArgs<IContent> args)
        {
            TestImportProperty myJsonObject = new TestImportProperty();

            foreach (var node in args.PublishedEntities)
            {
                if (node.ContentType.Alias == "nodeDocTypeAliasGoesHere")
                {
                    if (node.HasProperty("someProperty"))
                    {
                       // get each property from the node to match your json object
                        myJsonObject.SomeProperty = node.GetValue<string>("someProperty");
                    }

                    string json = JsonConvert.SerializeObject(myJsonObject);

                    //write string to file
                    System.IO.File.WriteAllText(HttpContext.Current.Server.MapPath("~") + "\\App_Data\\json\\json.txt", json);
                }
            }
        }
    }
}

NOTE - the example above would overwrite the file for each published node- it's likely you'll want to build a list and write this out - here serialise the list of "json" objects (probably have to covert it to an array first).

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