This recipe introduces the onError callback and demonstrates how we can use it to catch and handle errors in the PhantomJS runtime. As this onError callback is attached to the phantom object, we can use it to handle errors that are not otherwise handled by try-catch statements in our PhantomJS scripts or by onError handlers attached to webpage objects.

phantom.onError = function(message, trace) {
  console.error('[PHANTOMJS ERROR] ' + message);
  trace.forEach(function(t) {
    console.error('  >> [' + t.line + '] ' +
      (t.function ? '[' + t.function + '] ' : '') +
      t.file || t.sourceURL);...