[iOS + Android] Add the ability to intercept errors from native side and forward them to JS console by alwx · Pull Request #5622 · getsentry/sentry-react-native

alwx · 2026-02-05T14:09:22Z

📢 Type of change

Bugfix
New feature
Enhancement
Refactoring

📜 Description

Was born as an attempt to fix #5566 and turned out to be a good idea in general.
It also fixes #5242

This PR makes it possible to intercept native logs (currently only works with iOS and only with a patch, see notes below) and forward them to JS console:

Sentry.init({
  onNativeLog: ({ level, component, message }) => {
    // Use logWithoutTracing to avoid feedback loops with Sentry's console integration
    logWithoutTracing(`[Sentry Native] [${level.toUpperCase()}] [${component}] ${message}`);
  },
  debug: true,
}

(that only works when debug is set to true)

This PR makes it so that instead of handling HTTP code 413 somehow separately we can allow users to just get native logs in their JS console and see code 413 or any other error codes themselves. Filtering per level or component is also possible.

Notes

⚠️ Currently is works on Android without any further changes but on iOS it only works with a minor change to SentrySDKLog.swift. The change is done in this PR: getsentry/sentry-cocoa#7444

📝 Checklist

I added tests to verify changes
No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled
I updated the docs if needed.
I updated the wizard if needed.
All tests passing
No breaking changes

🔮 Next steps

github-actions · 2026-02-05T14:09:43Z

Semver Impact of This PR

⚪ None (no version bump detected)

📋 Changelog Preview

This is how your changes will appear in the changelog.
Entries from this PR are highlighted with a left border (blockquote style).

[iOS + Android] Add the ability to intercept errors from native side and forward them to JS console by alwx in #5622

Feat(Expo): Add expo constants on event context. by lucas-zimerman in #5748
chore(deps): update JavaScript SDK to v10.42.0 by github-actions in #5753
feat(core): Capture dynamic route params as span attributes by antonis in #5750
chore(deps): bump brace-expansion from 1.1.11 to 1.1.12 by dependabot in #5751
chore(deps): bump minimatch to fix ReDoS vulnerabilities and tmp to ^0.2.4 by antonis in #5749
chore(deps): bump getsentry/craft/.github/workflows/changelog-preview.yml from 2.21.7 to 2.23.1 by dependabot in #5738
chore(deps): update Wizard to v6.12.0 by github-actions in #5747
chore(deps): update JavaScript SDK to v10.41.0 by github-actions in #5744
chore(deps): bump tar to ^7.5.8 by antonis in #5703
chore(deps): bump js-yaml to fix prototype pollution in merge by antonis in #5709
chore(deps): bump ajv to fix ReDoS in $data option by antonis in #5710
chore(deps): update CLI to v3.2.3 by github-actions in #5743
Fixes the issue with unit mismatch in adjustTransactionDuration by alwx in #5740
Handle inactive state for spans by alwx in #5742
chore(deps): bump actions/github-script from 7 to 8 by dependabot in #5737
chore(deps): bump actions/upload-artifact from 6 to 7 by dependabot in #5739
chore(deps): bump futureware-tech/simulator-action from 4 to 5 by dependabot in #5735
chore(deps): bump actions/download-artifact from 7 to 8 by dependabot in #5736
chore(deps): bump path-to-regexp to 0.1.12 by antonis in #5706
fix(ios): resolve relative SOURCEMAP_FILE against project root in Xcode build script by antonis in #5730
test(metro): Add type tests for SentryExpoConfigOptions.getDefaultConfig by antonis in #5733
chore(deps): bump axios to ^1.13.5 by antonis in #5708
chore(deps): bump on-headers to ^1.1.0 by antonis in #5704

Plus 6 more

_{🤖 This preview updates automatically when you update the PR.}

packages/core/src/js/NativeLogListener.ts

lucas-zimerman

So far it's looking good! I left a few suggestions that would be nice to be addressed before merging.

alwx · 2026-02-12T10:06:19Z

I've updated this PR to support Android as well (that was easy on Android because all the required methods are already there) 🎉

github-actions · 2026-02-12T12:14:49Z

Android (legacy) Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	407.80 ms	432.87 ms	25.07 ms
Size	43.75 MiB	48.50 MiB	4.75 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
`86584b7`+dirty	463.83 ms	500.31 ms	36.48 ms
`9a81842`+dirty	412.23 ms	416.56 ms	4.33 ms
`c637fc7`+dirty	433.70 ms	467.76 ms	34.06 ms
`d73150f`+dirty	411.21 ms	465.86 ms	54.65 ms
`fa7bb7e`+dirty	350.37 ms	377.02 ms	26.65 ms
`3bd3f0d`+dirty	447.21 ms	472.31 ms	25.10 ms
`88890fe`+dirty	350.94 ms	365.74 ms	14.80 ms
`95aaf8a`	437.89 ms	419.45 ms	-18.44 ms
`c0842e7`+dirty	527.76 ms	566.69 ms	38.93 ms
`1e7a472`+dirty	348.80 ms	362.55 ms	13.75 ms

App size

Revision	Plain	With Sentry	Diff
`86584b7`+dirty	43.75 MiB	48.08 MiB	4.33 MiB
`9a81842`+dirty	43.75 MiB	48.08 MiB	4.33 MiB
`c637fc7`+dirty	43.75 MiB	48.40 MiB	4.64 MiB
`d73150f`+dirty	43.75 MiB	48.55 MiB	4.80 MiB
`fa7bb7e`+dirty	17.75 MiB	19.75 MiB	2.00 MiB
`3bd3f0d`+dirty	17.75 MiB	19.70 MiB	1.95 MiB
`88890fe`+dirty	17.75 MiB	19.71 MiB	1.96 MiB
`95aaf8a`	17.75 MiB	19.68 MiB	1.93 MiB
`c0842e7`+dirty	43.75 MiB	48.41 MiB	4.66 MiB
`1e7a472`+dirty	17.75 MiB	19.70 MiB	1.96 MiB

github-actions · 2026-02-12T12:15:23Z

Android (new) Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	462.49 ms	496.16 ms	33.67 ms
Size	43.94 MiB	49.36 MiB	5.42 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
`7480abe`+dirty	363.80 ms	431.34 ms	67.54 ms
`2b89ce9`+dirty	372.22 ms	417.06 ms	44.84 ms
`170d5ea`+dirty	348.79 ms	406.94 ms	58.15 ms
`b1579bc`+dirty	391.87 ms	456.26 ms	64.39 ms
`73f2455`+dirty	369.33 ms	398.90 ms	29.57 ms
`0b64753`+dirty	358.55 ms	429.16 ms	70.61 ms
`6a70a7e`+dirty	382.45 ms	424.54 ms	42.09 ms
`2adbd1e`+dirty	366.13 ms	419.49 ms	53.36 ms
`f8d19f8`+dirty	374.17 ms	383.40 ms	9.23 ms
`7be1f99`+dirty	369.02 ms	399.60 ms	30.58 ms

App size

Revision	Plain	With Sentry	Diff
`7480abe`+dirty	7.15 MiB	8.41 MiB	1.26 MiB
`2b89ce9`+dirty	7.15 MiB	8.41 MiB	1.26 MiB
`170d5ea`+dirty	7.15 MiB	8.42 MiB	1.27 MiB
`b1579bc`+dirty	43.94 MiB	49.27 MiB	5.33 MiB
`73f2455`+dirty	43.94 MiB	48.82 MiB	4.88 MiB
`0b64753`+dirty	7.15 MiB	8.42 MiB	1.27 MiB
`6a70a7e`+dirty	7.15 MiB	8.42 MiB	1.26 MiB
`2adbd1e`+dirty	7.15 MiB	8.43 MiB	1.28 MiB
`f8d19f8`+dirty	43.94 MiB	48.91 MiB	4.97 MiB
`7be1f99`+dirty	7.15 MiB	8.42 MiB	1.27 MiB

samples/react-native/ios/sentryreactnativesample.xcodeproj/project.pbxproj

antonis

Awesome idea and execution @alwx 🎸

⚠️ Currently is works on Android without any further changes but on iOS it only works with a minor change to SentrySDKLog.swift. The change is done in this PR: getsentry/sentry-cocoa#7444

Since this requires a Cocoa change we may target v8 (or wait to be merged) since the v9 bumped required changes in the ObjC gluecode and there might be conflicts with the changes here.

alwx · 2026-02-16T09:12:19Z

@antonis rebased this one to the current main 🎉

packages/core/ios/RNSentryNativeLogsForwarder.m

lucas-zimerman · 2026-03-02T15:46:00Z

it's weird the ios test is failing with any error

packages/core/ios/RNSentryNativeLogsForwarder.m

packages/core/src/js/NativeLogListener.ts

CHANGELOG.md

packages/core/src/js/NativeLogListener.ts

lucas-zimerman

There is the android issue that needs to be addressed (or disabled for now and done on a separated PR to fix it).
I found some nits that need some addressing.
On the iOS since things looks ok!

…cal 5-arg method that accepts both `currentActivity` and `configuration`

cursor

Cursor Bugbot has reviewed your changes and found 1 potential issue.

^{Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.}

cursor · 2026-03-04T14:49:27Z

packages/core/android/src/main/java/io/sentry/react/RNSentryLogger.java

+  private static final String EVENT_NAME = "SentryNativeLog";
+
+  private final AndroidLogger androidLogger;
+  private WeakReference<ReactApplicationContext> reactContextRef;


Non-volatile field risks stale reads across threads

Low Severity

The reactContextRef field is written from the JS thread in setReactContext and read from arbitrary threads in forwardToJS (wherever the Sentry SDK logs internally). Without volatile, there's no happens-before guarantee, so reader threads may see a stale null and silently skip forwarding logs to JS.

^{Triggered by project rule: PR Review Guidelines for Cursor Bot}

I think we can ignore this

packages/core/src/js/NativeLogListener.ts

antonis

LGTM! Thank you for your work on this Alex 🙇

lucas-zimerman

LGTM!

alwx force-pushed the alwx/experiment/native-logs branch from 2108fe1 to f369c1d Compare February 9, 2026 12:40

alwx changed the title ~~WIP: An (ongoing) experiment with adding native logs listener~~ Native logs listener Feb 10, 2026

alwx changed the title ~~Native logs listener~~ Native logs listener to intercept errors from native side and forward them to JS console Feb 10, 2026

alwx changed the title ~~Native logs listener to intercept errors from native side and forward them to JS console~~ Intercept errors from native side and forward them to JS console Feb 10, 2026

alwx changed the title ~~Intercept errors from native side and forward them to JS console~~ Add the ability to intercept errors from native side and forward them to JS console Feb 10, 2026

alwx self-assigned this Feb 10, 2026

alwx marked this pull request as ready for review February 10, 2026 10:51

alwx requested review from antonis and lucas-zimerman as code owners February 10, 2026 10:51

alwx added the ready-to-merge Triggers the full CI test suite label Feb 10, 2026

alwx changed the title ~~Add the ability to intercept errors from native side and forward them to JS console~~ [iOS only] Add the ability to intercept errors from native side and forward them to JS console Feb 10, 2026

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This was referenced Feb 12, 2026

Show Native Logs #5242

Closed

Making setOutput in SentrySDKLog.swift public to make it possible to forward logs to the JS console getsentry/sentry-cocoa#7444

Merged

alwx changed the title ~~[iOS only] Add the ability to intercept errors from native side and forward them to JS console~~ [iOS + Android] Add the ability to intercept errors from native side and forward them to JS console Feb 12, 2026

alwx requested a review from lucas-zimerman February 12, 2026 10:32

alwx force-pushed the alwx/experiment/native-logs branch from 524e190 to 313b4e6 Compare February 12, 2026 11:00

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alwx force-pushed the alwx/experiment/native-logs branch 2 times, most recently from ce577a8 to 2182293 Compare February 16, 2026 09:02

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alwx force-pushed the alwx/experiment/native-logs branch from 2bfd1ba to 61ea8c0 Compare February 16, 2026 09:15

alwx added 4 commits February 27, 2026 16:28

Changelog entry

fb3617f

Changelog entry moved

1afc4b6

Changelog entry fixed

666a146

Fix

be4b465

alwx force-pushed the alwx/experiment/native-logs branch from 913b181 to be4b465 Compare February 27, 2026 15:31

alwx requested a review from lucas-zimerman February 27, 2026 15:35

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alwx added 2 commits March 3, 2026 14:24

Merge branch 'main' into alwx/experiment/native-logs

e3731a7

Fixes

d4c5543

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Fixes

a9314a2

alwx requested a review from antonis March 3, 2026 13:55

alwx added 2 commits March 4, 2026 09:26

Merge branch 'main' into alwx/experiment/native-logs

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Merge branch 'main' into alwx/experiment/native-logs

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Consolidate the two startWithOptions overloads into a single canoni…

0ee38aa

…cal 5-arg method that accepts both `currentActivity` and `configuration`

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isExpoGo check

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alwx requested review from antonis and lucas-zimerman March 4, 2026 16:26

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alwx merged commit 878d0cc into main Mar 5, 2026
73 of 78 checks passed

alwx deleted the alwx/experiment/native-logs branch March 5, 2026 07:19

sentry-release-bot bot mentioned this pull request Mar 5, 2026

publish: getsentry/sentry-react-native@8.3.0 getsentry/publish#7350

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📝 Checklist

🔮 Next steps

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Android (legacy) Performance metrics 🚀

Baseline results on branch: main

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App size

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Android (new) Performance metrics 🚀

Baseline results on branch: main

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Non-volatile field risks stale reads across threads

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