Exception tracking with gtag.js

This guide describes how to use gtag.js to send exceptions to Google Analytics. Exception tracking allows you to measure the number and type of crashes or errors that occur on a web page.


When an error occurs, send an exception event to Google Analytics:

gtag('event', 'exception', {
  'description': 'error_description',
  'fatal': false   // set to true if the error is fatal

Exception parameters

The following table lists the exception parameters:

Parameter name Data type Required Description
description string No A description of the error.
fatal boolean No true if the error was fatal.


Given the following function:

function divide(x, y) {
  if (y == 0) {
    throw "Division by zero";
  return x/y;

the following code will send an exception event to Google Analytics if the divisor y is zero:

var x = document.getElementById('x').value;
var y = document.getElementById('y').value;

try {
  var r = divide(x, y);
} catch(err) {
  gtag('event', 'exception', {
    'description': err,
    'fatal': false