Sentry React SDK

Opinionated wizard that scans your React project and guides you through complete Sentry setup.

Invoke This Skill When

• User asks to "add Sentry to React" or "set up Sentry" in a React app
• User wants error monitoring, tracing, session replay, profiling, or logging in React
• User mentions @sentry/react, React Sentry SDK, or Sentry error boundaries
• User wants to monitor React Router navigation, Redux state, or component performance

Note: SDK versions and APIs below reflect current Sentry docs at time of writing (@sentry/react ≥8.0.0). Always verify against docs.sentry.io/platforms/javascript/guides/react/ before implementing.

Phase 1: Detect

Run these commands to understand the project before making any recommendations:

# Detect React version
cat package.json | grep -E '"react"|"react-dom"'

# Check for existing Sentry
cat package.json | grep '"@sentry/'

# Detect router
cat package.json | grep -E '"react-router-dom"|"@tanstack/react-router"'

# Detect state management
cat package.json | grep -E '"redux"|"@reduxjs/toolkit"'

# Detect build tool
ls vite.config.ts vite.config.js webpack.config.js craco.config.js 2>/dev/null
cat package.json | grep -E '"vite"|"react-scripts"|"webpack"'

# Detect logging libraries
cat package.json | grep -E '"pino"|"winston"|"loglevel"'

# Check for companion backend in adjacent directories
ls ../backend ../server ../api 2>/dev/null
cat ../go.mod ../requirements.txt ../Gemfile ../pom.xml 2>/dev/null | head -3

What to determine:

Phase 2: Recommend

Present a concrete recommendation based on what you found. Don't ask open-ended questions — lead with a proposal:

Recommended (core coverage):

• ✅ Error Monitoring — always; captures unhandled errors, React error boundaries, React 19 hooks
• ✅ Tracing — React SPAs benefit from page load, navigation, and API call tracing
• ✅ Session Replay — recommended for user-facing apps; records sessions around errors

Optional (enhanced observability):

• ⚡ Logging — structured logs via Sentry.logger.*; recommend when structured log search is needed
• ⚡ Profiling — JS Self-Profiling API (⚠️ experimental; requires cross-origin isolation headers)

Recommendation logic:

React-specific extras:

• React 19 detected → set up reactErrorHandler() on createRoot
• React Router detected → configure matching router integration (see Phase 3)
• Redux detected → add createReduxEnhancer() to Redux store
• Vite detected → configure sentryVitePlugin for source maps (essential for readable stack traces)

Propose: "I recommend setting up Error Monitoring + Tracing + Session Replay. Want me to also add Logging or Profiling?"

Phase 3: Guide

Install

npm install @sentry/react --save

Create src/instrument.ts

Sentry must initialize before any other code runs. Put Sentry.init() in a dedicated sidecar file:

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

Sentry.init({
  dsn: import.meta.env.VITE_SENTRY_DSN, // Adjust per build tool (see table below)
  environment: import.meta.env.MODE,
  release: import.meta.env.VITE_APP_VERSION, // inject at build time

  sendDefaultPii: true,

  integrations: [
    Sentry.browserTracingIntegration(),
    Sentry.replayIntegration({
      maskAllText: true,
      blockAllMedia: true,
    }),
  ],

  // Tracing
  tracesSampleRate: 1.0, // lower to 0.1–0.2 in production
  tracePropagationTargets: ["localhost", /^https:\/\/yourapi\.io/],

  // Session Replay
  replaysSessionSampleRate: 0.1,
  replaysOnErrorSampleRate: 1.0,

  enableLogs: true,
});

DSN environment variable by build tool:

Entry Point Setup

Import instrument.ts as the very first import in your entry file:

// src/main.tsx (Vite) or src/index.tsx (CRA/webpack)
import "./instrument";              // ← MUST be first

import { StrictMode } from "react";
import { createRoot } from "react-dom/client";
import App from "./App";

createRoot(document.getElementById("root")!).render(
  <StrictMode>
    <App />
  </StrictMode>
);

React Version-Specific Error Handling

React 19+ — use reactErrorHandler() on createRoot:

import { reactErrorHandler } from "@sentry/react";

createRoot(document.getElementById("root")!, {
  onUncaughtError: reactErrorHandler(),
  onCaughtError: reactErrorHandler(),
  onRecoverableError: reactErrorHandler(),
}).render(<App />);

React <19 — wrap your app in Sentry.ErrorBoundary:

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

createRoot(document.getElementById("root")!).render(
  <Sentry.ErrorBoundary fallback={<p>Something went wrong</p>} showDialog>
    <App />
  </Sentry.ErrorBoundary>
);

Use <Sentry.ErrorBoundary> for any sub-tree that should catch errors independently (route sections, widgets, etc.).

Router Integration

Configure the matching integration for your router:

React Router v6/v7 setup:

// in instrument.ts integrations array:
import React from