These examples should be used as guidance when configuring Sentry functionality within a project.

Exception Catching

• Use Sentry.captureException(error) to capture an exception and log the error in Sentry.
• Use this in try catch blocks or areas where exceptions are expected

Tracing Examples

• Spans should be created for meaningful actions within an applications like button clicks, API calls, and function calls
• Use the Sentry.startSpan function to create a span
• Child spans can exist within a parent span

Custom Span instrumentation in component actions

• The name and op properties should be meaningful for the activities in the call.
• Attach attributes based on relevant information and metrics from the request

function TestComponent() {
  const handleTestButtonClick = () => {
    // Create a transaction/span to measure performance
    Sentry.startSpan(
      {
        op: "ui.click",
        name: "Test Button Click",
      },
      (span) => {
        const value = "some config";
        const metric = "some metric";

        // Metrics can be added to the span
        span.setAttribute("config", value);
        span.setAttribute("metric", metric);

        doSomething();
      },
    );
  };

  return (
    <button type="button" onClick={handleTestButtonClick}>
      Test Sentry
    </button>
  );
}

Custom span instrumentation in API calls

• The name and op properties should be meaningful for the activities in the call.
• Attach attributes based on relevant information and metrics from the request

async function fetchUserData(userId) {
  return Sentry.startSpan(
    {
      op: "http.client",
      name: `GET /api/users/${userId}`,
    },
    async () => {
      const response = await fetch(`/api/users/${userId}`);
      const data = await response.json();
      return data;
    },
  );
}

Logs

• Where logs are used, ensure Sentry is imported using import * as Sentry from "@sentry/nextjs"
• Enable logging in Sentry using Sentry.init({ _experiments: { enableLogs: true } })
• Reference the logger using const { logger } = Sentry
• Sentry offers a consoleLoggingIntegration that can be used to log specific console error types automatically without instrumenting the individual logger calls

Configuration

• In NextJS the client side Sentry initialization is in instrumentation-client.ts, the server initialization is in sentry.edge.config.ts and the edge initialization is in sentry.server.config.ts
• Initialization does not need to be repeated in other files, it only needs to happen the files mentioned above. You should use import * as Sentry from "@sentry/nextjs" to reference Sentry functionality

Baseline

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

Sentry.init({
  dsn: "https://examplePublicKey@o0.ingest.sentry.io/0",

  _experiments: {
    enableLogs: true,
  },
});

Logger Integration

Sentry.init({
  dsn: "https://examplePublicKey@o0.ingest.sentry.io/0",
  integrations: [
    // send console.log, console.error, and console.warn calls as logs to Sentry
    Sentry.consoleLoggingIntegration({ levels: ["log", "error", "warn"] }),
  ],
});

Logger Examples

logger.fmt is a template literal function that should be used to bring variables into the structured logs.

logger.trace("Starting database connection", { database: "users" });
logger.debug(logger.fmt`Cache miss for user: ${userId}`);
logger.info("Updated profile", { profileId: 345 });
logger.warn("Rate limit reached for endpoint", {
  endpoint: "/api/results/",
  isEnterprise: false,
});
logger.error("Failed to process payment", {
  orderId: "order_123",
  amount: 99.99,
});
logger.fatal("Database connection pool exhausted", {
  database: "users",
  activeConnections: 100,
});