React Error and Performance Monitoring

Detect, understand, and fix errors and performance bottlenecks with clear, actionable debugging context for your React application—across components, state changes, and API requests.


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React monitoring for developers

Get detailed stack traces and debugging context for every error.

  • Trace connected issues across components, state updates, and async operations.

  • See exactly what led up to an issue to debug hydration errors, navigation failures, layout shifts, and rage clicks.

Powered by OpenTelemetry, Trace user interactions, slow component rendering, and API calls in a single trace without having to piece together logs or dashboards for debugging.

  • Track React hooks and effects causing performance degradation

  • Monitor page loads and redirects with TanStack or React Router integrations

  • Redux Router for state management. 

Sentry spots the bottlenecks that are impacting real users like:

  • Rendering delays from inefficient hooks and effects

  • Unnecessary re-renders that degrade performance

  • Slow API responses from fetch calls and state updates

  • Blocking middleware increasing response times

  • Bloated React bundles

Codecov gives you clear insights into your React app’s coverage and test performance, helping you spot coverage gaps and fix flaky tests.

  • Identify gaps in component and API test coverage

  • Spot flaky tests causing CI/CD failures

  • Ensure critical functionality like state updates and routing is well-tested

Getting started is simple

Grab the Sentry React SDK:

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npm install @sentry/react

We recommend putting the Sentry initialization code into its own file and including that file as the first import in your application entry point as shown in the example below:

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import { useEffect } from "react";
import * as Sentry from "@sentry/react";

Sentry.init({
  dsn: "https://examplePublicKey@o0.ingest.sentry.io/0",
  integrations: [
  ],
  // Set `tracePropagationTargets` to control for which URLs trace propagation should be enabled
  tracePropagationTargets: [/^\//, /^https:\/\/yourserver\.io\/api/],
});

Include the Sentry initialization file as the first import statement:

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// Sentry initialization should be imported first!
import "./instrument";
import App from "./App";
import { createRoot } from "react-dom/client";

const container = document.getElementById(“app”);
const root = createRoot(container);
root.render(<App />);
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Common React Issues Solved

Hydration Errors

Whether it's a flickering UI or missing elements, Sentry's hydration error diff tools make it easy to instantly detect and debug mismatches between server-rendered and client-rendered HTML.

Component Performance Issues

Monitor React component render times and identify slow updates that impact user experience.

State Management Debugging

Track Redux actions and state transitions to understand what changed before an issue occurred.

Prevent Silent Failures in Scheduled Tasks

 Missed background syncs or failed API updates can go unnoticed, leading to broken functionality. Ensure your scheduled tasks are running on time and without errors with Sentry’s monitoring tools

Detect Downtime

Get real-time alerts when your application is unavailable, so you can respond quickly before it impacts your users.

FAQs

Traditional logging provides you with a trail of events. Some of those events are errors, but many times they’re simply informational. Sentry is fundamentally different because we focus on exceptions, or in other words, we capture application crashes. We discuss in more detail here and on our blog.

Sentry supports every major frontend language, framework, and library. You can browse each of them here.

You can get started for free. Pricing depends on the number of monthly events, transactions, and attachments that you send Sentry. For more details, visit our pricing page.

Sentry doesn’t impact a web site’s performance.

If you look at the configuration options for when you initialize Sentry in your code, you’ll see there’s nothing regarding minimizing its impact on your app’s performance. This is because our team of SDK engineers already developed Sentry with this in mind.

Sentry is a listener/handler for errors that asynchronously sends out the error/event to Sentry.io. This is non-blocking. The error/event only goes out if this is an error.

Global handlers have almost no impact as well, as they are native APIs provided by the browsers.

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