Use a browser-specific SDK in the React app and a Node.js SDK in the server. Initialize each in its own runtime before the application code it needs to observe, then verify events, add a React error boundary where useful, and configure source maps for readable production stack traces. This walkthrough uses Sentry’s documented JavaScript integrations; “API” here means the SDK interfaces your app imports, not a custom endpoint you need to build.
What “error tracking API” means for this setup
For a React-and-Node.js SaaS app, error tracking is usually added by importing a service’s SDK into each runtime. The browser client and server are separate execution environments, so each needs its own integration and project configuration. Sentry’s JavaScript SDK guide lists distinct packages for React and Node.js: Sentry JavaScript SDK guide.
This is different from integrating a service’s HTTP API directly. Sentry’s API reference documents its API; it is not evidence that your application needs to create a new error-reporting endpoint. In a typical SDK integration, your code initializes the SDK and the SDK sends events to the configured destination.
Set up the React browser app
Install and initialize the React SDK early
Follow the current React installation instructions for the package and framework setup that match your app. Initialize the SDK before React is initialized or mounted, so it can observe errors from the application rather than starting after the relevant code has run. Configure the browser integration with the DSN for the appropriate project, which identifies the event destination. See Sentry’s React SDK guide.
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Use the browser project’s intended settings in browser code. Do not put secrets or private server configuration in a client bundle: code shipped to a browser is available to users.
Add an error boundary for component-tree failures
When a failed component subtree should show a recovery interface, wrap the relevant part of the React tree in the SDK’s ErrorBoundary and provide a fallback. The boundary can capture JavaScript errors in its component tree and render that fallback. It is a targeted UI recovery mechanism; it does not replace runtime-wide error capture or server-side monitoring.
Instrument the Node.js server
Load instrumentation before application modules
Install and initialize the Node.js SDK according to the JavaScript SDK guide. Load the instrumentation as early as possible—and before the application modules that need automatic instrumentation. If application modules load first, the SDK may not be able to instrument them as intended.
Keep server setup separate from browser setup. Configure the server SDK for the server’s project and destination, and keep private configuration on the server rather than exposing it through React’s client bundle.
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Make production stack traces readable
Production builds commonly minify or transpile code, making stack traces harder to map to the original files. Source maps let the monitoring service translate those traces back into original source terms. The React SDK guide describes uploading source maps through build plugins or the CLI: React SDK guide: source maps.
Choose an upload and serving approach that fits your deployment and security requirements. In particular, decide whether publicly served source maps are acceptable for your app. Source maps improve diagnosis, but their availability and exposure should be deliberate rather than an accidental side effect of the build.
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Verify that both runtimes send events
- Start the app with the React and Node.js SDKs initialized in their respective runtimes.
- In development, deliberately trigger a test exception in the browser app, following the verification approach in the React SDK guide.
- Open the relevant monitoring project and confirm that the event appears. Check the server runtime separately with a controlled server-side exception so you know both integrations are reporting.
- After deploying a release, inspect a production event’s stack trace and confirm that source maps resolve it to the expected original files.
Keep deliberate test failures controlled: use a development environment or a clearly identifiable test event so they are not mistaken for customer-impacting errors.
Filter events and remove sensitive data
Before events leave the app, review what data they may contain and apply filtering or scrubbing where appropriate. The JavaScript SDK guide demonstrates a beforeSend hook for dropping selected events and removing sensitive user data: JavaScript SDK guide. Treat its example as a starting point, not a universal privacy policy; adapt the rules to the data your application actually handles and the requirements that apply to it.
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Implementation checklist
- Use the React SDK for browser-side errors and the Node.js SDK for server-side errors.
- Initialize each SDK early; on Node.js, load instrumentation before the modules it should instrument.
- Use a React ErrorBoundary when a subtree-specific fallback improves recovery.
- Configure source-map uploads as part of the build or release workflow, and choose intentionally whether maps are publicly accessible.
- Trigger controlled test errors and check that events reach the correct monitoring project.
- Review event payloads and configure filtering or scrubbing before sending sensitive data.
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