Proactively discover, predict, and resolve errors in real-time with Rollbar’s error monitoring platform. Start tracking errors today!
 [](https://www.npmjs.com/package/rollbar) [](https://www.npmjs.com/package/rollbar) --- ## 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. ## Session Replay (Beta) **Important:** Session Replay is now available in beta! This feature captures and replays user sessions around errors, helping you understand exactly what happened before an error occurred. Replay can also be triggered based on custom conditions to capture critical user flows. Because Session Replay includes additional recording capabilities, it uses a **separate, larger bundle**. If you want to use Session Replay, import from `rollbar/replay` instead of `rollbar`: ```javascript // Standard bundle (smaller, no replay) import Rollbar from 'rollbar'; // Session Replay bundle (includes replay capabilities) import Rollbar from 'rollbar/replay'; ``` Choose the standard bundle if you don't need replay functionality. For Session Replay configuration and usage, see our [Session Replay documentation](https://docs.rollbar.com/docs/session-replay). ## Installation Using npm: ```bash npm install --save rollbar ``` Using yarn: ```bash yarn add rollbar ``` For CDN/script tag installation, see [Quick Start → Browser](#browser) ## Quick Start First, [**sign up for a Rollbar account**](https://rollbar.com/signup) if you haven't already. ### Browser For the recommended snippet-based installation with automatic error capture and telemetry, see our [Browser JS – Quick Start documentation](https://docs.rollbar.com/docs/browser-js#quick-start). ### Node.js ```javascript const Rollbar = require('rollbar'); const rollbar = new Rollbar({ accessToken: 'POST_SERVER_ITEM_ACCESS_TOKEN', captureUncaught: true, captureUnhandledRejections: true, payload: { code_version: '1.0.0' }, }); // log a generic message and send to rollbar rollbar.log('Hello world!'); ``` For **framework** integrations (**Express**, **Koa**, **Hapi**, and more), custom error handlers, and advanced configuration, see our [Node.js server configuration documentation](https://docs.rollbar.com/docs/nodejs#server-configuration). ## Usage and Reference For complete usage instructions and configuration reference, see our [Javascript SDK docs](https://docs.rollbar.com/docs/javascript). ### Examples See the [examples directory](./examples/) for detailed integration examples with various frameworks and build tools including **React**, **Angular**, **Vue.js**, **Next.js**, and more. ## 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 and Contributing For development setup, guidelines, and instructions on submitting pull requests, please see our [Contributing Guide](CONTRIBUTING.md).