FYI, here are some concrete examples, and some demos of a multi player cross platform networked AR system I developed that's based on shitloads of JSON config files describing objects, behaviors, catalog entries, user interface, a multi player networking protocol, etc.

Pantomime extensively (and extensibly) uses the simple JSON templating system I described in this other link, which I wrote in C#. Everything you see is a plug-in object, and they're all described and configured in JSON, and implemented in C#:

https://news.ycombinator.com/item?id=20735366

Pantomime Playground - Immersive Virtual Worlds for the Rest of Us

https://vimeo.com/137924152

Pantomime Creatures - Real-Time Augmented Reality

https://vimeo.com/183132061

Bug Farm – First Minute, First Person 3D

https://vimeo.com/148805981

Consumer Augmented Reality Arrives – with Pantomime

https://vimeo.com/149319403

If I were to rewrite it from scratch, I'd simply use JavaScript instead of rolling my own JSON templating system, because it would have been much more flexible and powerful.

Oh wait -- I DID rewrite at least some of that stuff from scratch! To illustrate that superior JavaScript-centric approach, here's an example of some other JSON based systems I developed with Unity3D and JavaScript, one for scripting ARKit on iOS, and the other for scripting financial visualization on WebGL, both using UnityJS (an extension I developed for scripting and configuring and debugging Unity3D in JavaScript).

One nice thing about it is that you can debug and live code your Unity3D apps running on the mobile device or in the web browser while it's running, using the standard JavaScript debugging tools!

UnityJS is a plugin for Unity 5 that integrates JavaScript and web browser components into Unity, including a JSON messaging system and a C# bridge, using JSON.net.

https://github.com/SimHacker/UnityJS

WovenAR Tools with ARKit and Pantomime (built with an early version of UnityJS):

https://vimeo.com/240612327

A description of UnityJS, and how I use JavaScript and JSON to define, configure and control Unity3D objects:

https://news.ycombinator.com/item?id=19804242

https://news.ycombinator.com/item?id=19748582

https://news.ycombinator.com/item?id=19745034

Here's a demo of another more recent application using UnityJS that reads shitloads of JSON data from spreadsheets, including both financial data, configuration, parameters, object templates, etc.

https://reasonstreet.co/2019/01/31/how-does-amazon-make-mone...

https://reasonstreet.co/2019/08/09/tech-giants-acquisitions/

Here is an article about how the JSON spreadsheet system works, and discusses some ideas about JSON definition, editing and templating with spreadsheets, which is about a year old, but that I've developed it a lot further since writing that article.

https://medium.com/@donhopkins/representing-and-editing-json...

>Representing and Editing JSON with Spreadsheets

>I’ve been developing a convenient way of representing and editing JSON in spreadsheets, that I’m very happy with, and would love to share!

>I‘ve been successfully synergizing JSON with spreadsheets, and have developed a general purpose approach and sample implementation that I’d like to share. So I’ll briefly describe how it works (and share the code and examples), in the hopes of receiving some feedback and criticism.
Here is the question I’m trying to answer:

>How can you conveniently and compactly represent, view and edit JSON in spreadsheets, using the grid instead of so much punctuation?

>My goal is to be able to easily edit JSON data in any spreadsheet, conveniently copy and paste grids of JSON around as TSV files (the format that Google Sheets puts on your clipboard), and efficiently export and import those spreadsheets as JSON.

>So I’ve come up with a simple format and convenient conventions for representing and editing JSON in spreadsheets, without any sigils, tabs, quoting, escaping or trailing comma problems, but with comments, rich formatting, formulas, and leveraging the full power of the spreadsheet.

>It’s especially powerful with Google Sheets, since it can run JavaScript code to export, import and validate JSON, provide colorized syntax highlighting, error feedback, interactive wizard dialogs, and integrations with other services. Then other apps and services can easily retrieve those live spreadsheets as TSV files, which are super-easy to parse into 2D arrays of strings to convert to JSON.

[...]

>Philosophy: The goal is to leverage the spreadsheet grid format to reduce syntax and ambiguity, and eliminate problems with brackets, braces, quotes, colons, commas, missing commas, tabs versus spaces, etc.

>Instead, you enjoy important benefits missing from JSON like like comments, rich formatting, formulas, and the ability to leverage the spreadsheet’s power, flexibility, programmability, ubiquity and familiarity.

More info:

https://news.ycombinator.com/item?id=17384078

https://news.ycombinator.com/item?id=18860467

https://news.ycombinator.com/item?id=18171571