[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

chore(deps): update JavaScript SDK to v10.39.0 by github-actions in #5674
fix(spotlight): Add Sentry Spotlight dependency for debug builds by romtsn in #5667
chore(deps): bump github/codeql-action from 4.32.2 to 4.32.3 by dependabot in #5669
chore(deps): bump faraday from 1.10.4 to 1.10.5 in /samples/react-native-macos by dependabot in #5671
chore(deps): bump getsentry/craft/.github/workflows/changelog-preview.yml from 2.21.2 to 2.21.4 by dependabot in #5668
chore(deps): bump getsentry/craft from 2.21.2 to 2.21.4 by dependabot in #5670
feat: v8: Expose iOS options to ignore views from subtree traversal by antonis in #5663
chore(deps): bump faraday from 1.10.4 to 1.10.5 in /samples/react-native by dependabot in #5658
chore(deps): bump faraday from 1.10.4 to 1.10.5 in /performance-tests by dependabot in #5659

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

github-actions · 2026-02-05T14:10:03Z

	Fails
🚫	Please consider adding a changelog entry for the next release.

Instructions and example for changelog

Please add an entry to CHANGELOG.md to the "Unreleased" section. Make sure the entry includes this PR's number.

Example:

## Unreleased

### Features

- [iOS + Android] Add the ability to intercept errors from native side and forward them to JS console ([#5622](https://github.com/getsentry/sentry-react-native/pull/5622))

If none of the above apply, you can opt out of this check by adding #skip-changelog to the PR description or adding a skip-changelog label.

Generated by 🚫 dangerJS against fcba8c8

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	447.61 ms	502.88 ms	55.27 ms
Size	43.75 MiB	48.42 MiB	4.67 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
`2f9fb30`+dirty	416.78 ms	444.94 ms	28.16 ms
`8d89cc9`+dirty	537.83 ms	536.02 ms	-1.81 ms
`6fee48d`+dirty	407.42 ms	437.71 ms	30.29 ms
`d751a5d`+dirty	434.24 ms	486.08 ms	51.84 ms
`05bef0e`+dirty	349.78 ms	334.04 ms	-15.74 ms
`f8d19f8`+dirty	422.98 ms	421.98 ms	-1.00 ms
`cd5f27f`+dirty	494.04 ms	516.62 ms	22.58 ms
`1ef8a04`+dirty	415.16 ms	415.22 ms	0.06 ms
`459a438`+dirty	417.09 ms	406.52 ms	-10.57 ms
`5c16cdc`+dirty	423.48 ms	452.35 ms	28.88 ms

App size

Revision	Plain	With Sentry	Diff
`2f9fb30`+dirty	43.75 MiB	48.05 MiB	4.29 MiB
`8d89cc9`+dirty	17.75 MiB	19.68 MiB	1.94 MiB
`6fee48d`+dirty	17.75 MiB	19.68 MiB	1.94 MiB
`d751a5d`+dirty	17.75 MiB	19.68 MiB	1.94 MiB
`05bef0e`+dirty	17.75 MiB	19.70 MiB	1.95 MiB
`f8d19f8`+dirty	43.75 MiB	48.08 MiB	4.33 MiB
`cd5f27f`+dirty	43.75 MiB	48.41 MiB	4.66 MiB
`1ef8a04`+dirty	43.75 MiB	48.05 MiB	4.29 MiB
`459a438`+dirty	17.75 MiB	19.70 MiB	1.95 MiB
`5c16cdc`+dirty	17.75 MiB	19.68 MiB	1.94 MiB

github-actions · 2026-02-12T12:15:23Z

Android (new) Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	437.64 ms	487.13 ms	49.49 ms
Size	43.94 MiB	49.29 MiB	5.35 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
`6c11c6a`+dirty	462.02 ms	488.50 ms	26.48 ms
`b80b14f`+dirty	320.33 ms	376.06 ms	55.73 ms
`05bef0e`+dirty	451.63 ms	533.90 ms	82.27 ms
`c4e097a`+dirty	382.43 ms	443.77 ms	61.34 ms
`6c36ba5`+dirty	367.14 ms	426.80 ms	59.66 ms
`cd5f27f`+dirty	388.19 ms	447.42 ms	59.23 ms
`136effd`+dirty	451.30 ms	450.87 ms	-0.43 ms
`161947d`+dirty	349.27 ms	435.09 ms	85.82 ms
`2adbd1e`+dirty	366.13 ms	419.49 ms	53.36 ms
`180638b`+dirty	434.46 ms	470.90 ms	36.44 ms

App size

Revision	Plain	With Sentry	Diff
`6c11c6a`+dirty	43.94 MiB	48.92 MiB	4.98 MiB
`b80b14f`+dirty	43.94 MiB	48.87 MiB	4.93 MiB
`05bef0e`+dirty	7.15 MiB	8.43 MiB	1.28 MiB
`c4e097a`+dirty	7.15 MiB	8.41 MiB	1.26 MiB
`6c36ba5`+dirty	43.94 MiB	49.27 MiB	5.33 MiB
`cd5f27f`+dirty	43.94 MiB	49.27 MiB	5.33 MiB
`136effd`+dirty	43.94 MiB	48.81 MiB	4.88 MiB
`161947d`+dirty	7.15 MiB	8.43 MiB	1.28 MiB
`2adbd1e`+dirty	7.15 MiB	8.43 MiB	1.28 MiB
`180638b`+dirty	43.94 MiB	48.91 MiB	4.97 MiB

antonis · 2026-02-12T12:55:49Z

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

nit: Let's skip the changes on this file since it's mainly formatting

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 🎉

antonis

@antonis rebased this one to the current main 🎉

Awesome! The change LGTM. Let's wait for getsentry/sentry-cocoa#7444 to land in the next Cocoa release and 🚢

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

lucas-zimerman reviewed Feb 10, 2026

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packages/core/src/js/NativeLogListener.ts Show resolved Hide resolved

lucas-zimerman reviewed Feb 10, 2026

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This was referenced Feb 12, 2026

Show Native Logs #5242

Open

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

Open

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

antonis reviewed Feb 12, 2026

View reviewed changes

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

alwx requested a review from antonis February 16, 2026 09:12

alwx added 8 commits February 16, 2026 10:15

An (ongoing) experiment with adding native logs listener

6f6171f

NativeLogListener.ts

5437acb

Log forwarder

61dec2f

Fixes

25d3c35

Fixes

c6368f6

Android changes

33b9ea5

Fixes

457aec4

Missing Android logger

61ea8c0

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

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

f22f040

antonis reviewed Feb 16, 2026

View reviewed changes

alwx added 2 commits February 16, 2026 13:57

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

4a1e0cb

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

fcba8c8

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📢 Type of change

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Android (legacy) Performance metrics 🚀

Baseline results on branch: main

Startup times

App size

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Android (new) Performance metrics 🚀

Baseline results on branch: main

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