#Sentry.captureMessage does not work inside useEffect, basically i want to log state changes

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polar sphinx
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Sentry.captureMessage does not work inside useEffect, basically i want to log state changes

dreamy raptorBOT
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Hi @polar sphinx. I'm happy to dig into this for you! I'll check my internal sources for answers to your question! :wave:

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If you're finding that Sentry.captureMessage does not work inside a useEffect for logging state changes, this is not expected behavior according to the official Sentry documentation. The recommended way to log side effects (such as state changes) in React is to use captureMessage or captureException inside a useEffect hook. Here’s an example from the documentation:

import * as Sentry from "@sentry/react";
import { useEffect } from "react";

function App() {
  const [info, error] = useQuery("/api/info");
  useEffect(() => {
    if (error) {
      Sentry.captureException(error);
    }
  }, [error]);

  // ...
}

You can use the same pattern for captureMessage:

useEffect(() => {
  Sentry.captureMessage("State changed!");
}, [yourState]);

If Sentry.captureMessage is not working for you inside useEffect, here are some things to check:

  1. SDK Initialization: Ensure Sentry is properly initialized before the hook runs.
  2. Environment: Some issues have been reported in specific environments (e.g., React Native on Android, or with certain Next.js configurations), but generally, captureMessage should work in a standard React app.
  3. Release/Production Builds: In some cases, errors or messages may not appear in Sentry due to build configuration or because the SDK is disabled in production. Double-check your Sentry configuration and environment variables.
  4. Error Boundaries: If you are using custom error boundaries, make sure you are not swallowing errors or preventing Sentry from capturing them. For messages, this is less likely to be an issue, but worth checking.
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There is no indication in the knowledge sources that captureMessage is fundamentally incompatible with useEffect. In fact, Sentry recommends using their capture methods inside useEffect for side effects like logging state changes. If you are still experiencing issues, please provide more details about your setup, or check for SDK initialization and configuration problems. For more information, see the official documentation on capturing errors and messages in React apps Capturing Errors and Events in React and Capturing Messages.

If you are using React Native, there have been some platform-specific issues, but generally, captureMessage inside useEffect should work as expected React Native SDK Issue.

If you continue to have trouble, please share a minimal reproducible example or check your Sentry project settings and SDK version.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

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