Don’t Let Third-Party JavaScript Ruin Your Website and Reputation

Did you know that any third-party JavaScript running on your website can be a security risk for your website, and also your customers?

Third-party JavaScript, includes popular analytics, chat, social media or payment scripts. These scripts can intercept customer data, or make harmful changes to your website. As a result, third-party JavaScript is a growing target for hackers.

Script Scanner constantly monitors your third-party JavaScript and alerts you when changes are detected.

With Script Scanner’s continuous monitoring, you can protect your website, your customers and your brand’s reputation.

How Script Scanner Protects Your Website And Customers

Continuous Monitoring

Continuous Monitoring

Script Scanner is constantly looking for any changes in your third-party JavaScript. We can detect changes, even if the third-party JavaScript has been minified.

We can monitor your third-party JavaScript, as often as every 10 minutes every day, depending on your selected check intervals.


Change Notifications

When Script Scanner detects a change in any of your third-party JavaScript monitors, an alert message is sent to your chosen notification address.

Your notification addresses can include multiple Email addresses and/or Slack or Microsoft Teams channels of your choice.


Differences Highlighted

All Script Scanner alert messages include a full html diff file. This diff file clearly shows the changes between the old and new versions of the third-party JavaScript.

You can then use this diff file to quickly evaluate these third-party JavaScript changes, and protect your website and customers.

Why You Need To Monitor Third-Party JavaScript



Any time you include someone else’s third-party JavaScript on your website, there is an underlying security risk.

Hackers are constantly targeting third-party JavaScript, because it is installed on multiple websites, with full access to make changes, to your website.

Can you risk not knowing what has changed, when the third-party JavaScript on your website changes?



Changes in third-party JavaScript running on your website, can have knock on effects on how your website both looks and performs.

Third-party JavaScript can cause display problems, and slow down your website. This can harm your ranking in the search engines and reduce your number of visitors.

How long will your customers wait, if third-party JavaScript affects your website, before leaving for a competitor?



The UK’s data watchdog has fined airline British Airways £20 million, ($26 million US dollars), having proposed a much larger fine.

This is for a data breach, reportedly caused by a malicious change in third-party JavaScript running on their website, which went undetected for more than 2 weeks.

Could your business survive a large fine for a data breach, caused by undetected changes in third-party JavaScript?

How It Works

Step 1

Add Notification Address

Add a notification address so that Script Scanner can alert you when changes are detected in the third-party JavaScript you are monitoring.

You can have multiple email addresses, Slack channels or Microsoft Teams channels, as a notification address.

Notification Address

Step 2

Third Party JavaScript Monitors

Add Third-Party JavaScript Monitors

Add the third-party JavaScript you want Script Scanner to monitor and notify you of any changes.

You can select from a list of the most popular common third-party JavaScript, eg Google Analytics, or AdSense for example.

Alternatively, simply add the URL of any other third-party JavaScript you want Script Scanner to monitor.

Then, select the monitoring check interval and the notification address you want to use for the change notification alerts.

Step 3

Notification Alerts

Script Scanner will then monitor your third-party JavaScript, and alert you when changes are detected.

Every alert message includes a full html difference file, clearly showing the changes between the old and new versions of the third-party JavaScript.

Use Script Scanner’s continuous monitoring to protect your website, your website’s visitors and your brand’s reputations from hackers targeting third-party JavaScript.

Notification Alerts

Frequently Asked Questions

Yes, almost certainly. The majority of websites have multiple instances of third-party JavaScript in use.

Any analytics, advertising, chat, payment or social media functionality on your website will usually be activated, on your website by third-party JavaScript.
Script Scanner has already created a list of some of the most popular third-party JavaScript is use on many websites.

These third-party JavaScript monitors can be added, simply be selecting your choice of this common third-party JavaScript, your notification address and your monitor check interval.

For any other individual third-party JavaScript, unique to your website, simply add the URL of the third-party JavaScript. Then select your chosen notification address, your monitor check interval and Script Scanner will start monitoring for changes.
Script Scanner looks for any changes in the size of third-party JavaScript, as well as for changes in the cryptographic hash, which is calculated from the contents of the file.

This hash creates a unique ‘fingerprint’ that will change, whenever the third-party JavaScript changes
Depending on your subscription plan, Script Scanner can check your selected third-party JavaScript as often as every 10 minutes.

You can choose to check your third-party JavaScript monitors at different intervals, for different monitors.

The check intervals available, include daily, every 8 hours, every 4 hours, every hour, every 30 minutes and every 10 minutes, depending on your chosen subscription plan.

Protect your website and customers with continuous third-party JavaScript monitoring from Script Scanner