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React Log Monitoring with LogMonitor

>_ why react apps need log monitoring

React applications run entirely in the user's browser, making it impossible to see errors without proper logging. Users rarely report bugs with enough detail to reproduce them. LogMonitor captures every console.log, console.error, and unhandled exception from your React app and streams it to your Live Console in real time.

>_ how logmonitor works with react

Install the logmonitor-js SDK from npm and call logmonitor.init() in your app's entry point (index.js or main.tsx). The SDK auto-patches console.log, console.info, console.warn, console.error, and console.debug, and captures unhandled errors automatically. All logs appear in your LogMonitor Live Console within milliseconds. Logs are only sent in production (when process.env.NODE_ENV === 'production').

>_ quick start

index.js · javascript
import React from 'react';
import ReactDOM from 'react-dom/client';
import { logmonitor } from 'logmonitor-js';
import App from './App';
logmonitor.init({ apiKey: 'your-api-key' });
ReactDOM.createRoot(document.getElementById('root')).render(<App />);
// Anywhere in your React components
console.log('Dashboard loaded', { userId: '123', role: 'admin' });
console.error('Failed to fetch data', { component: 'UserList', status: 503 });

>_ what you can monitor

  • $Unhandled JavaScript exceptions and React error boundaries
  • $API call failures and network errors
  • $Component rendering errors and state issues
  • $User interaction and navigation events
  • $Performance bottlenecks and slow renders
  • $Authentication flow errors

>_ frequently asked questions

$ Does LogMonitor work with Create React App and Vite?

Yes. The logmonitor-js SDK is a standard npm package that works with any React setup, including Create React App, Vite, Next.js, Remix, and custom Webpack configurations.

$ Can I capture React Error Boundary errors?

Yes. In your Error Boundary's componentDidCatch method, log the error with console.error and it will appear in your LogMonitor Live Console with full stack trace and component information.

$ Does the SDK increase my bundle size significantly?

No. The logmonitor-js SDK is lightweight and adds minimal overhead to your bundle. It is designed for production use with performance as a priority.

$ Can I use LogMonitor with React Native?

For React Native, you can use the logmonitor-js SDK just like in a regular React app. For Flutter-based mobile apps, use the dedicated logmonitor_flutter SDK instead.

$ How do I filter logs by user in React?

Pass user identifiers as metadata in your log calls. For example: console.log('Action performed', { userId: '123' }). Then filter by that field in the LogMonitor dashboard.

>_ related pages

>_ about logmonitor

LogMonitor.io is a log observability platform built for developers who want simple, fast, affordable log monitoring without enterprise complexity. Stream production logs from your users' devices in real-time with native Flutter and React SDKs. Set up in under 5 minutes, with plans starting at $9/month. No dashboards to configure, no query languages to learn — just your logs, live.

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