ImportJSON.js

//create panel for user to select file
var open = NSOpenPanel.openPanel();
var fileTypes = [NSArray arrayWithObjects:@"json",nil];

open.setAllowedFileTypes(fileTypes);
open.setCanChooseDirectories(true);
open.setCanChooseFiles(true);
open.setCanCreateDirectories(true);
open.setTitle("Import a Color Palette");
open.setPrompt("Import Palette");
open.runModal();

//import the selected file and parse to JSON object
var filePath = open.URLs().firstObject().path();
var fileContents = NSString.stringWithContentsOfFile(filePath);
var paletteContents = JSON.parse(fileContents);

//create array to hold JSON object for easy reference
var palette = [];

for(var x in paletteContents){
  palette.push(paletteContents[x]);
}