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

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 Bundler Plugins to v4.9.1 by github-actions in #5649
CI: update workflows with newer version of Xcode (+ iOS SDK) by alwx in #5635
chore(deps): update Android SDK to v8.32.0 by github-actions in #5633
chore(deps): bump getsentry/craft from 2.20.1 to 2.21.2 by dependabot in #5630
chore(deps): bump getsentry/craft/.github/workflows/changelog-preview.yml from 2.20.1 to 2.21.2 by dependabot in #5632
chore(deps): bump github/codeql-action from 4.32.0 to 4.32.2 by dependabot in #5631
feat(feedback): Add autoCorrect and spellCheck config to FeedbackWidget by sbs44 in #5627
fix(feedback): Deep merge custom styles with defaults in FeedbackWidget by sbs44 in #5625

_{🤖 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 313b4e6

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	471.51 ms	527.06 ms	55.55 ms
Size	43.75 MiB	48.41 MiB	4.66 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
`9a81842`+dirty	412.23 ms	416.56 ms	4.33 ms
`6c36ba5`+dirty	385.48 ms	442.36 ms	56.88 ms
`bc9680d`	375.15 ms	401.12 ms	25.97 ms
`eec00c2`+dirty	447.08 ms	469.04 ms	21.96 ms
`ebf60f9`+dirty	378.38 ms	405.48 ms	27.10 ms
`bfe454a`+dirty	573.44 ms	579.46 ms	6.02 ms
`20daa0a`	359.51 ms	374.90 ms	15.39 ms
`1bea095`+dirty	401.42 ms	426.93 ms	25.52 ms
`88890fe`+dirty	350.94 ms	365.74 ms	14.80 ms
`682f0f5`+dirty	422.31 ms	431.87 ms	9.57 ms

App size

Revision	Plain	With Sentry	Diff
`9a81842`+dirty	43.75 MiB	48.08 MiB	4.33 MiB
`6c36ba5`+dirty	43.75 MiB	48.41 MiB	4.66 MiB
`bc9680d`	17.75 MiB	20.15 MiB	2.41 MiB
`eec00c2`+dirty	43.75 MiB	48.05 MiB	4.29 MiB
`ebf60f9`+dirty	43.75 MiB	48.07 MiB	4.32 MiB
`bfe454a`+dirty	17.75 MiB	19.69 MiB	1.94 MiB
`20daa0a`	17.75 MiB	20.15 MiB	2.41 MiB
`1bea095`+dirty	17.75 MiB	19.70 MiB	1.95 MiB
`88890fe`+dirty	17.75 MiB	19.71 MiB	1.96 MiB
`682f0f5`+dirty	43.75 MiB	48.08 MiB	4.33 MiB

github-actions · 2026-02-12T12:15:23Z

Android (new) Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	377.38 ms	435.79 ms	58.41 ms
Size	43.94 MiB	49.27 MiB	5.33 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
`9a81842`+dirty	508.08 ms	566.65 ms	58.56 ms
`af9331b`+dirty	374.42 ms	425.68 ms	51.26 ms
`6c36ba5`+dirty	367.14 ms	426.80 ms	59.66 ms
`eec00c2`+dirty	367.00 ms	392.12 ms	25.12 ms
`ec14be7`+dirty	401.58 ms	475.26 ms	73.68 ms
`170d5ea`+dirty	348.79 ms	406.94 ms	58.15 ms
`ebf60f9`+dirty	398.18 ms	426.27 ms	28.08 ms
`bc9680d`+dirty	346.77 ms	463.48 ms	116.71 ms
`90afdd3`+dirty	367.79 ms	404.84 ms	37.05 ms
`8db9631`+dirty	351.44 ms	396.28 ms	44.84 ms

App size

Revision	Plain	With Sentry	Diff
`9a81842`+dirty	43.94 MiB	48.91 MiB	4.97 MiB
`af9331b`+dirty	7.15 MiB	8.41 MiB	1.26 MiB
`6c36ba5`+dirty	43.94 MiB	49.27 MiB	5.33 MiB
`eec00c2`+dirty	43.94 MiB	48.87 MiB	4.93 MiB
`ec14be7`+dirty	7.15 MiB	8.42 MiB	1.26 MiB
`170d5ea`+dirty	7.15 MiB	8.42 MiB	1.27 MiB
`ebf60f9`+dirty	43.94 MiB	48.90 MiB	4.96 MiB
`bc9680d`+dirty	7.15 MiB	8.42 MiB	1.27 MiB
`90afdd3`+dirty	7.15 MiB	8.43 MiB	1.28 MiB
`8db9631`+dirty	7.15 MiB	8.43 MiB	1.28 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 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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packages/core/src/js/NativeLogListener.ts Show resolved Hide resolved

lucas-zimerman requested changes 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 added 8 commits February 12, 2026 12:00

An (ongoing) experiment with adding native logs listener

b75b594

NativeLogListener.ts

4e0885b

Log forwarder

cdadc73

Fixes

ff955ad

Fixes

7f4aaad

Android changes

49948fe

Fixes

4fbc19d

Missing Android logger

313b4e6

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

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

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alwx commented Feb 12, 2026

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github-actions bot commented Feb 12, 2026

Android (legacy) Performance metrics 🚀

Baseline results on branch: main

Startup times

App size

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github-actions bot commented Feb 12, 2026

Android (new) Performance metrics 🚀

Baseline results on branch: main

Startup times

App size

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antonis Feb 12, 2026

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