Save JSON object to file in Chrome Devtool

console.save.js

// e.g. console.save({hello: 'world'})
(function(console){
  console.save = function(data, filename){
    if(!data) {
      console.error('Console.save: No data')
      return;
    }
    if(!filename) filename = 'console.json'
    if(typeof data === "object"){
      data = JSON.stringify(data, undefined, 4)
    }
    var blob = new Blob([data], {type: 'text/json'}),
        e    = document.createEvent('MouseEvents'),
        a    = document.createElement('a')
    a.download = filename
    a.href = window.URL.createObjectURL(blob)
    a.dataset.downloadurl =  ['text/json', a.download, a.href].join(':')
    e.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null)
    a.dispatchEvent(e)
  }
})(console)

This is awesome!

This is really awesome. initMouseEvent is deprecated. You can replace it like this.

(function (console) {
    console.save = function (data, filename) {
        if (!data) {
            console.error('Console.save: No data')
            return;
        }
        if (!filename) filename = 'console.json'
        if (typeof data === "object") {
            data = JSON.stringify(data, undefined, 4)
        }
        var blob = new Blob([data], { type: 'text/json' }),
            a = document.createElement('a')
        var e = new MouseEvent('click', {
            view: window,
            bubbles: true,
            cancelable: false
        });

        a.download = filename
        a.href = window.URL.createObjectURL(blob)
        a.dataset.downloadurl = ['text/json', a.download, a.href].join(':')
        a.dispatchEvent(e)
    }
})(console)

You can skip the mouse event. The click() event works

console.save = function (data, filename) {
  if (!data) {
    console.error('Console.save: No data');
    return;
  }
  
  if (!filename) {
    filename = 'console.json'; 
  }
  
  if (typeof data === "object") {
    data = JSON.stringify(data, undefined, 4);
  }
  
  var blob = new Blob([data], { type: 'text/json' });
  var a = document.createElement('a');

  a.download = filename;
  a.href = window.URL.createObjectURL(blob);
  a.dataset.downloadurl = ['text/json', a.download, a.href].join(':');
  a.click();
}