a simple function to export a JSON file

saveJSON.js

function saveJSON(data, saveAs){
  var stringified = JSON.stringify(data, null, 2); 
  var blob = new Blob([stringified], {type: "application/json"});
  var url = URL.createObjectURL(blob);
  
  var a = document.createElement('a');
  a.download = saveAs + '.json';
  a.href = url;
  a.id = saveAs;
  document.body.appendChild(a);
  a.click();
  document.querySelector('#' + a.id).remove();
} 

/*

running saveJSON([1,2,3], 'anArray');

will pop up a save dialog to save a file called anArray.json which contains [1,2,3].

You can pass in whatever (like a text, a corpus, etc).

*/