How Do You Keep a Web Tool Reliable When Third-Party Platforms Keep Changing?

Building a web tool is one thing, but keeping it reliable over time is a different challenge.

I've been exploring how browser-based tools work, especially tools that interact with different platforms through URLs.

One example is ClipSaves, a web-based video downloader that allows users to fetch content from different social media platforms using a simple link-based workflow.

One challenge with projects like this is that third-party platforms frequently change their systems, which can affect how integrations work.

I'm curious about how other developers approach this.

A few questions for developers:

How do you manage integrations when third-party platforms frequently change their APIs or page structures?

What is your preferred approach for handling failed requests and unexpected responses?

Do you use automated testing to monitor whether integrations are still working?

What tools or technologies would you recommend for making these systems more reliable?

I'd love to hear about your experiences, approaches, and lessons learned from building similar projects.