@grafana/faro-react

Faro package that enables easier integration in projects built with React.

Out of the box, the package provides you the following features:

• Error Boundary - Provides additional stacktrace for errors and configuration options for pushError behavior
• Component Profiler - Capture every re-render of a component, the un/mounting time etc.
• Router (v4-v6) integration - Send events for all route changes
• SSR support

The Faro Web SDK is a highly configurable open source real user monitoring (RUM) library built on OpenTelemetry and integrating seamlessly with Grafana Cloud and Grafana Frontend Observability.

Faro-React is a distribution of the Faro Web SDK for project using React, which offers easier integrations and the following features:

• Support for React Router v6 or v4/v5.x: send events for all route changes, including the data router API
• Error boundary: enhancements to stack traces and configuration options for pushError behavior
• Component profiler: to capture component renders, un/mounting time, and more
• Server side rendering (SSR) support

Install the Faro-React Web SDK

First add Faro-React to your project. Install the Faro-React package by running the following command for NPM:

npm i @grafana/faro-react

Or with Yarn:

yarn add @grafana/faro-react

The Faro-React package offers all the functionality and behavior from the Faro Web SDK package plus additional React specific functionality like router instrumentation, a custom ErrorBoundary, and more.

Add the following code snippet to your project to import Faro-React with the minimum setup needed to get insights into the health and performance of your application or website:

import { initializeFaro } from '@grafana/faro-react';

initializeFaro({
  // required: the URL of the Grafana collector
  url: 'my/collector/url',

  // required: the identification label of your application
  app: {
    name: 'my-react-app',
  },
});

Faro-React captures data about your application’s health and performance and exports them to the configured collector like Grafana Alloy.

Instrument your application

The Faro-React package offers all the functionality and behavior from the Faro Web SDK package plus additional React specific functionality like router instrumentation, a custom ErrorBoundary, and more.

Router v6 with Data Router

Instrument the routes from a React data router (BrowserRouter, HashRouter, or MemoryRouter).

In the file you create your data router, often the App.* file pass your data router to the Faro-React function withFaroRouterInstrumentation to wrap all your routes and apply Faro auto instrumentation:

const reactBrowserRouter = createBrowserRouter([
  // your routes...
]);

const browserRouter = withFaroRouterInstrumentation(reactBrowserRouter);

Router v6 (no Data Router)

In the file you define your router, import createRoutesFromChildren, matchRoutes, Routes, useLocation, useNavigationType from react-router-dom and pass them to the dependencies object.

import { createRoutesFromChildren, matchRoutes, Routes, useLocation, useNavigationType } from 'react-router-dom';

import { getWebInstrumentations, initializeFaro, ReactIntegration, ReactRouterVersion } from '@grafana/faro-react';

initializeFaro({
  // Mandatory, the URL of the Grafana collector
  url: 'my/collector/url',

  // Mandatory, the identification label of your application
  app: {
    name: 'my-react-app',
  },

  // ...

  instrumentations: [
    // Load the default Web instrumentations
    ...getWebInstrumentations(),

    new ReactIntegration({
      router: {
        version: ReactRouterVersion.V6,
        dependencies: {
          createRoutesFromChildren,
          matchRoutes,
          Routes,
          useLocation,
          useNavigationType,
        },
      },
    }),
  ],
});

To instrument React Router v6 import the <FaroRoutes/> component and use it instead of the React router <Routes /> component, for example:

import { FaroRoutes } from '@grafana/faro-react';

// during render
<FaroRoutes>
  <Route path="/" element={<Home />} />
  {/* ... */}
</FaroRoutes>;

Router v4/v5

To instrument React Router v4 or v5, import the Route component from react-router-dom and the history object from the history package and pass them to the dependencies object:

The final result should look similar like this example:

import { createBrowserHistory } from 'history';
import { Route } from 'react-router-dom';

import { getWebInstrumentations, initializeFaro, ReactIntegration, ReactRouterVersion } from '@grafana/faro-react';

const history = createBrowserHistory();

initializeFaro({
  // Mandatory, the URL of the Grafana collector
  url: 'my/collector/url',

  // Mandatory, the identification label of your application
  app: {
    name: 'my-react-app',
  },

  // ...

  instrumentations: [
    // Load the default Web instrumentations
    ...getWebInstrumentations(),

    new ReactIntegration({
      router: {
        version: ReactRouterVersion.V5, // or ReactRouterVersion.V4,
        dependencies: {
          history, // the history object used by react-router
          Route, // Route component imported from react-router package
        },
      },
    }),
  ],
});

To instrument React Router v4, v5 import the <FaroRoute/> component and use it instead of the React router <Route /> component, for example:

import { FaroRoute } from '@grafana/faro-react';

// during render
<Switch>
  <FaroRoute path="/">
    <Home />
  </FaroRoute>
  {/* ... */}
</Switch>;

React ErrorBoundary support

React Error boundaries are components that allow you to render a fallback UI in case an error occurs in the respective React component tree.

Faro provides its own error boundary component which enhances the standard React error boundary with Faro specific functionality.

In case of an error it sends a Faro error event which contains the error message, the React component stack of the component which contains the exception, and the name of name of the error boundary if configured.

import { FaroErrorBoundary } from '@grafana/faro-react';

// during render
<FaroErrorBoundary>
  <App />
</FaroErrorBoundary>;

or

import { withErrorBoundary } from '@grafana/faro-react';

export default withErrorBoundary(App);

FaroErrorBoundary properties

Configuration options:

• fallback: The fallback UI to render instead, either:
  • a ReactElement
  • FaroErrorBoundaryFallbackRender function that passes the Error object and a callback function to reset the error boundary to it’s initial state when called
• pushErrorOptions: Options passed to the pushError API, for example additional context to an error

Lifecycle callbacks:

• beforeCapture: Executed before the Faro pushError API call, with the Error object as a parameter
• onError: Executed when an error occurs, with the Error object as a parameter
• onMount: Executed when React calls the componentDidMount lifecycle hook
• onUnmount: Executed when React calls the componentWillUnmount lifecycle hook, with the Error object as a parameter
• onReset: Executed when React calls resetErrorBoundary, with the Error object as a parameter

// ...

<FaroErrorBoundary>
  <MyComponent />
</FaroErrorBoundary>

import { FaroErrorBoundary, PushErrorOptions } from '@grafana/faro-react';

const pushErrorOptions: PushErrorOptions = {
  type: "Custom Error Type"
  context: {
    foo: "bar",
    baz: "abc"
  },
};

// during render
<FaroErrorBoundary
  beforeCapture={(error) => handleBeforeCapture(error)}
  onError={(error) => handleError(error)}
  onMount={() => handleOnMount()}
  onUnmount={(error) => handleUnmount(error)}
  onReset={(error) => handleReset(error)}
  pushErrorOptions={pushErrorOptions}
  fallback={(error, resetBoundary) => {
    return errorBoundaryFallbackRenderer(error, resetBoundary) }}
 >
  <App />
</FaroErrorBoundary>;

React erver side rendering support

Follow this guide to learn how to initialize your Faro instrumentation to support React Server Side Rendering (SSR) for:

React Router v6 without a data router:

import { FaroErrorBoundary, setReactRouterV6SSRDependencies } from '@grafana/faro-react';
setReactRouterV6SSRDependencies({ Routes });

export function renderToString(...) {
  return reactRenderToString(
    <FaroErrorBoundary>
      <StaticRouter location={...}>
        <App />
      </StaticRouter>
    </FaroErrorBoundary>
  ),
}

React Router v6 with a data router:

Wrap your data router with withFaroRouterInstrumentation(dataRouter) in your routes file.

React Router v5:

import { FaroErrorBoundary, setReactRouterV4V5SSRDependencies } from '@grafana/faro-react';
setReactRouterV4V5SSRDependencies({ Route, history });

export function renderToString(...) {
  return reactRenderToString(
    <FaroErrorBoundary>
      <StaticRouter location={...}>
        <App />
      </StaticRouter>
    </FaroErrorBoundary>
  ),
}

React component profiling

Follow this guide to setup and use the Faro Profiler to get insights into the render performance of a React components.

WARNING Using the profiler has an impact on performance and should not be used in production.

To use the Faro profiler, import the Faro web-tracing package and initialize Faro-React as follows:

import { withFaroProfiler } from '@grafana/faro-react';

export default withFaroProfiler(MyReactComponent);

Upgrading from a v4, v5, v6 router to data router

This section describes how to upgrade the Faro React router instrumentation if you already have a React app instrumented which doesn’t use data routers.

In the ReactIntegration call, change the version property from ReactRouterVersion.[V4|V5|V6] to ReactRouterVersion.V6_data_router.

If you use React Router v4 or v5 remove the history and Route dependencies and add the matchRoutes function exported by react-router-dom.

If you use React Router v6 remove the following dependencies from the dependencies object:

• createRoutesFromChildren
• Routes
• useLocation
• useNavigationType

The ReactIntegration call should look similar to:

import { matchRoutes } from 'react-router-dom';

import { getWebInstrumentations, initializeFaro, ReactIntegration, ReactRouterVersion } from '@grafana/faro-react';

initializeFaro({
  // ...

  instrumentations: [
    // Load the default Web instrumentations
    ...getWebInstrumentations(),

    new ReactIntegration({
      router: {
        version: ReactRouterVersion.V6_data_router,
        dependencies: {
          matchRoutes,
        },
      },
    }),
  ],
});