Sentry React Setup

Install and configure Sentry in React projects.

Invoke This Skill When

• User asks to "add Sentry to React" or "install Sentry" in a React app
• User wants error monitoring, logging, or tracing in React
• User mentions "@sentry/react" or React error boundaries

Install

npm install @sentry/react --save

Configure

Create src/instrument.js (must be imported first in your app):

import * as Sentry from "@sentry/react";

Sentry.init({
  dsn: "YOUR_SENTRY_DSN",
  sendDefaultPii: true,
  
  // Tracing
  integrations: [Sentry.browserTracingIntegration()],
  tracesSampleRate: 1.0,
  tracePropagationTargets: [/^\//, /^https:\/\/yourserver\.io\/api/],
  
  // Session Replay
  integrations: [Sentry.replayIntegration()],
  replaysSessionSampleRate: 0.1,
  replaysOnErrorSampleRate: 1.0,
  
  // Logs
  enableLogs: true,
});

Import First in Entry Point

// src/index.js or src/main.jsx
import "./instrument";  // Must be first!
import App from "./App";
import { createRoot } from "react-dom/client";

const root = createRoot(document.getElementById("app"));
root.render(<App />);

Error Handling

React 19+

Use error hooks with createRoot:

import { createRoot } from "react-dom/client";
import * as Sentry from "@sentry/react";

const root = createRoot(document.getElementById("app"), {
  onUncaughtError: Sentry.reactErrorHandler(),
  onCaughtError: Sentry.reactErrorHandler(),
  onRecoverableError: Sentry.reactErrorHandler(),
});

React <19

Use ErrorBoundary component:

import * as Sentry from "@sentry/react";

<Sentry.ErrorBoundary fallback={<p>An error occurred</p>}>
  <MyComponent />
</Sentry.ErrorBoundary>

React Router Integration

Redux Integration (Optional)

import * as Sentry from "@sentry/react";
import { configureStore } from "@reduxjs/toolkit";

const store = configureStore({
  reducer,
  enhancers: (getDefaultEnhancers) =>
    getDefaultEnhancers().concat(Sentry.createReduxEnhancer()),
});

Source Maps

Upload source maps for readable stack traces:

npx @sentry/wizard@latest -i sourcemaps

Environment Variables

REACT_APP_SENTRY_DSN=https://xxx@o123.ingest.sentry.io/456
SENTRY_AUTH_TOKEN=sntrys_xxx
SENTRY_ORG=my-org
SENTRY_PROJECT=my-project

Verification

Add test button to trigger error:

<button onClick={() => { throw new Error("Sentry Test Error"); }}>
  Test Sentry
</button>

Troubleshooting