Set up Sentry monitoring for Next.js app (claude-opus-4-5-20251101)#34
Set up Sentry monitoring for Next.js app (claude-opus-4-5-20251101)#34
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thamam
commented
Nov 25, 2025
thamam
commented
- Create sentry.client.config.ts with client-side initialization and replay integration
- Create sentry.server.config.ts for server-side error tracking
- Create sentry.edge.config.ts for edge runtime support
- Update next.config.ts to wrap config with withSentryConfig
- Add /sentry-test page with error trigger button for verification
- Create sentry.client.config.ts with client-side initialization and replay integration - Create sentry.server.config.ts for server-side error tracking - Create sentry.edge.config.ts for edge runtime support - Update next.config.ts to wrap config with withSentryConfig - Add /sentry-test page with error trigger button for verification
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Summary of ChangesHello @thamam, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request integrates Sentry monitoring into the Next.js application. It establishes comprehensive error tracking across client, server, and edge environments, configuring Sentry with appropriate settings for each. Additionally, a dedicated test page has been added to allow for easy verification of the Sentry integration. Highlights
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Code Review
This pull request sets up Sentry monitoring for the Next.js application, which is a great step for error tracking and performance monitoring. The implementation follows the standard Sentry setup for Next.js by creating separate configuration files for client, server, and edge runtimes, and wrapping the Next.js config. My review includes several critical and high-severity suggestions to improve security and configuration management by using environment variables for sensitive data like the Sentry DSN and organization slug, instead of hardcoding them. I've also included medium-severity suggestions to handle the Sentry test page in production and to use environment-aware sampling rates to manage costs.
| import * as Sentry from "@sentry/nextjs"; | ||
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| Sentry.init({ | ||
| dsn: "https://examplePublicKey@o0.ingest.sentry.io/0", |
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Hardcoding credentials, even placeholders, is a security risk and bad practice. The Sentry DSN should be loaded from an environment variable to keep secrets out of the source code. For client-side code, the environment variable must be prefixed with NEXT_PUBLIC_.
| dsn: "https://examplePublicKey@o0.ingest.sentry.io/0", | |
| dsn: process.env.NEXT_PUBLIC_SENTRY_DSN, |
| import * as Sentry from "@sentry/nextjs"; | ||
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| Sentry.init({ | ||
| dsn: "https://examplePublicKey@o0.ingest.sentry.io/0", |
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Hardcoding credentials, even placeholders, is a security risk and bad practice. The Sentry DSN should be loaded from an environment variable to keep secrets out of the source code. It's recommended to use a consistent environment variable name across all Sentry configurations.
| dsn: "https://examplePublicKey@o0.ingest.sentry.io/0", | |
| dsn: process.env.NEXT_PUBLIC_SENTRY_DSN, |
| import * as Sentry from "@sentry/nextjs"; | ||
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| Sentry.init({ | ||
| dsn: "https://examplePublicKey@o0.ingest.sentry.io/0", |
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Hardcoding credentials, even placeholders, is a security risk and bad practice. The Sentry DSN should be loaded from an environment variable to keep secrets out of the source code. It's recommended to use a consistent environment variable name across all Sentry configurations.
| dsn: "https://examplePublicKey@o0.ingest.sentry.io/0", | |
| dsn: process.env.NEXT_PUBLIC_SENTRY_DSN, |
| // For all available options, see: | ||
| // https://github.com/getsentry/sentry-webpack-plugin#options | ||
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| org: "example-org", |
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The Sentry organization slug is hardcoded. It's better to use an environment variable for this to avoid committing environment-specific information to the repository and to make it easier to change for different environments (e.g., staging vs. production Sentry projects).
| org: "example-org", | |
| org: process.env.SENTRY_ORG, |
| "use client"; | ||
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| export default function SentryTestPage() { | ||
| return ( | ||
| <div className="min-h-screen bg-gray-100 flex items-center justify-center"> | ||
| <div className="bg-white rounded-lg shadow-lg p-8 text-center"> | ||
| <h1 className="text-2xl font-bold text-gray-800 mb-6"> | ||
| Sentry Error Test | ||
| </h1> | ||
| <p className="text-gray-600 mb-6"> | ||
| Click the button below to trigger a test error for Sentry. | ||
| </p> | ||
| <button | ||
| type="button" | ||
| onClick={() => { | ||
| throw new Error("Sentry Test"); | ||
| }} | ||
| className="bg-red-500 hover:bg-red-600 text-white font-bold py-3 px-6 rounded-lg transition-colors" | ||
| > | ||
| Trigger Error | ||
| </button> | ||
| </div> | ||
| </div> | ||
| ); | ||
| } |
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This test page is useful for verification, but it will be included in the production build. This is not ideal as it exposes a non-functional page to users and adds unnecessary code. It's better to prevent this page from rendering in production environments by checking process.env.NODE_ENV and returning a 404 page.
"use client";
import { notFound } from "next/navigation";
export default function SentryTestPage() {
if (process.env.NODE_ENV === "production") {
notFound();
}
return (
<div className="min-h-screen bg-gray-100 flex items-center justify-center">
<div className="bg-white rounded-lg shadow-lg p-8 text-center">
<h1 className="text-2xl font-bold text-gray-800 mb-6">
Sentry Error Test
</h1>
<p className="text-gray-600 mb-6">
Click the button below to trigger a test error for Sentry.
</p>
<button
type="button"
onClick={() => {
throw new Error("Sentry Test");
}}
className="bg-red-500 hover:bg-red-600 text-white font-bold py-3 px-6 rounded-lg transition-colors"
>
Trigger Error
</button>
</div>
</div>
);
}
| dsn: "https://examplePublicKey@o0.ingest.sentry.io/0", | ||
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| // Adjust this value in production, or use tracesSampler for greater control | ||
| tracesSampleRate: 1, |
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The tracesSampleRate is set to 1, which will send 100% of transactions to Sentry. This is fine for development but can be very costly in production. It's better to have different rates for development and production environments.
| tracesSampleRate: 1, | |
| tracesSampleRate: process.env.NODE_ENV === "development" ? 1.0 : 0.1, |
| dsn: "https://examplePublicKey@o0.ingest.sentry.io/0", | ||
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| // Adjust this value in production, or use tracesSampler for greater control | ||
| tracesSampleRate: 1, |
There was a problem hiding this comment.
The tracesSampleRate is set to 1, which will send 100% of transactions to Sentry. This is fine for development but can be very costly in production. It's better to have different rates for development and production environments.
| tracesSampleRate: 1, | |
| tracesSampleRate: process.env.NODE_ENV === "development" ? 1.0 : 0.1, |
| dsn: "https://examplePublicKey@o0.ingest.sentry.io/0", | ||
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| // Adjust this value in production, or use tracesSampler for greater control | ||
| tracesSampleRate: 1, |
There was a problem hiding this comment.
The tracesSampleRate is set to 1, which will send 100% of transactions to Sentry. This is fine for development but can be very costly in production. It's better to have different rates for development and production environments.
| tracesSampleRate: 1, | |
| tracesSampleRate: process.env.NODE_ENV === "development" ? 1.0 : 0.1, |
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