Rollbar

Overview

Rollbar is an error tracking and monitoring platform that captures JavaScript exceptions in the browser and server-side errors in backend applications, providing developers with real-time alerting, stack traces, and contextual debugging data. It is used by engineering teams to detect, triage, and resolve production bugs faster. Rollbar focuses purely on application reliability — it does not engage in advertising, marketing analytics, or behavioral profiling.

What This Script Does

The Rollbar browser SDK (cdn.rollbar.com/rollbarjs/refs/heads/stable/rollbar.min.js) instruments the host application for error capture:

JavaScript error capture

• Attaches handlers to window.onerror and window.onunhandledrejection to intercept unhandled exceptions and promise rejections
• Captures the full error message, error type, and stack trace for each exception
• Instruments console.error calls to optionally capture manually logged errors
• Transmits error payloads to Rollbar's API (api.rollbar.com/api/1/item/) in real time

Error context enrichment

• Each error payload includes: browser type and version, operating system, viewport dimensions, current page URL, and referral source
• The request object includes the HTTP method, headers, and query parameters of the page where the error occurred
• Rollbar's transform and checkIgnore hooks allow developers to filter out noise, anonymize data, or add custom context before transmission
• Custom fingerprinting rules group similar errors across different stack trace variants

User context attachment

• Developers can call Rollbar.configure({ payload: { person: { id, email, username } } }) to attach user identity to error reports
• When user context is set, each error report is linked to the authenticated user's record in Rollbar's dashboard for customer-specific debugging
• This is optional and depends on the developer's implementation

Telemetry capture

• Rollbar's telemetry feature captures a breadcrumb trail of browser events leading up to an error: DOM mutations, network requests, console logs, and navigation events
• This breadcrumb timeline helps developers reconstruct the user's path to reproducing the error

Consent & Compliance

• Category: Functional — error tracking is an operational tool for application reliability, not a behavioral analytics or advertising tool
• GDPR: Rollbar processes technical data (error logs, stack traces, browser metadata) for legitimate interests in operating a reliable application service. If user identity (email, user ID) is attached to error reports via Rollbar.configure(), that constitutes personal data processing — a DPA should be in place and the privacy policy should disclose error monitoring tooling.
• Data transfers: Rollbar is a US company headquartered in San Francisco. Error data is processed in the US. EU-US Data Privacy Framework applies. Rollbar provides a Data Processing Agreement for GDPR compliance.
• No ad tracking: Rollbar sets no advertising cookies, builds no behavioral profiles, and shares no data with advertising networks. Error payload data is used solely for application debugging.
• Cookies set: None — Rollbar does not set cookies. It uses an in-memory session UUID for grouping errors within a single page session, not a persistent cookie.

Should You Block This Without Consent?

No consent required. Rollbar is a functional error monitoring tool with no advertising or behavioral tracking purposes. It does not set persistent cookies and does not build cross-site profiles. Under GDPR and ePrivacy, error monitoring scripts used for legitimate operational purposes do not require consent. Disclose Rollbar in your privacy policy as a technical infrastructure processor.