Simple and privacy friendly

Track JavaScript Errors

Monitor JavaScript errors in your web applications. Get details needed to fix bugs quickly.

Try for free

No credit card required

Console Error Logo

Fix bugs faster

Easy to use error tracking for your web applications

Discover issues
happening to your customers

Graphs

Visualize events happening in your web application. See how many errors you have, how often they occur, and how they affect your users.

Detailed Reports

Get detailed information about each error, including stack traces, affected users, and more. Dive deep into the data to understand the root cause of the problem.

Why choose FailWarn?

Open source

We are fully open-source, and funded by our subscribers.

Privacy friendly

We don’t track users, and we don’t collect personal data.

Lightweight script

Our frontend bundle is lightweight and won’t slow down your app.

No tricks, no hidden fees

Just choose a plan that suits your needs, and you are ready to go.

A Brand You Can Trust

" First-class customer support. We are very happy with the service. "


Tom

Developer

" Helped us to identify and fix bugs. Now, it is an essential part of our process. "


Anna

CTO, ObsLabs

" Monitor exceptions, improve our observability. "


David

Software Engineer

Start monitoring JavaScript errors

Get started in minutes. No credit card required.

Guides, Product Updates, and Helpful Tips

JavaScript Async Await Guide (2025)

JavaScript Async Await Guide (2025)

Understand JavaScript's async/await pattern to write cleaner asynchronous code. Learn the syntax, best practices, error handling, and real-world implementation examples for modern web development.

How to fix: SecurityError: Blocked by CORS Policy

How to fix: SecurityError: Blocked by CORS Policy

Cross Origin Resource Sharing error typically arises when a web application attempts to make a request to a different domain than the one that served the web page, violating the browser's Same-Origin Policy.