Proactively discover, predict, and resolve errors in real-time with Rollbar’s error monitoring platform. Start tracking errors today!
 [](https://lgtm.com/projects/g/rollbar/rollbar.js/context:javascript) [](https://lgtm.com/projects/g/rollbar/rollbar.js/alerts) --- ## Key benefits of using Rollbar.js are: - **Cross platform:** Rollbar.js supports both server-side and client-side Javascript, including frameworks such as React, Angular, Express, Next.js and more. - **Telemetry:** The telemetry timeline provides a list of “breadcrumbs” events that can help developers understand and fix problems in their client-side javascript. Learn more about telemetry. - **Automatic error grouping:** Rollbar aggregates Occurrences caused by the same error into Items that represent application issues. Learn more about reducing log noise. - **Advanced search:** Filter items by many different properties. Learn more about search. - **Customizable notifications:** Rollbar supports several messaging and incident management tools where your team can get notified about errors and important events by real-time alerts. Learn more about Rollbar notifications. ## Setup Instructions 1. [Sign up for a Rollbar account](https://rollbar.com/signup). 2. For client-side Javascript, follow the [Browser Quick Start](https://docs.rollbar.com/docs/javascript#section-quick-start-browser) instructions. For Node.js, follow the [Server Quick Start](https://docs.rollbar.com/docs/javascript#section-quick-start-server). ## Usage and Reference For complete usage instructions and configuration reference, see our [Javascript SDK docs](https://docs.rollbar.com/docs/javascript). ## Release History & Changelog See our [Releases](https://github.com/rollbar/rollbar.js/releases) page for a list of all releases, including changes. ## Help / Support If you run into any issues, please email us at [support@rollbar.com](mailto:support@rollbar.com). For bug reports, please [open an issue on GitHub](https://github.com/rollbar/rollbar.js/issues/new). ## Developing To set up a development environment, you'll need Node.js and npm. 2. `npm install -D` 3. `make` To run the tests, run `make test`. ## Contributing 1. [Fork it](https://github.com/rollbar/rollbar.js). 2. Create your feature branch (`git checkout -b my-new-feature`). 3. Commit your changes (`git commit -am 'Added some feature'`). 4. Push to the branch (`git push origin my-new-feature`). 5. Create a new Pull Request.