I'm just toying with the idea of:
Save the json with extension .json;
Use a hidden iframe with this file as source;
Use the load event of the iframe;
Use innerHTML to get this content;
Use JSON.parse() to convert it to a JSON object.
This kind of thing may work locally, but test it live as well.
"I'm here to save your life. But if I'm going to do that, I'll need total uninanonynymity
." Me Myself & Irene
Validate your HTML