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---
title: QR and Barcode Scanning in React Native with VisionCamera V5
description: A step-by-step production guide to scanning QR codes and barcodes in React Native using VisionCamera V5, covering the MLKit-based CodeScanner component,...
canonical: https://daily.dev/posts/qr-and-barcode-scanning-in-react-native-with-visioncamera-v5-mnniglptv
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og:description: A step-by-step production guide to scanning QR codes and barcodes in React Native using VisionCamera V5, covering the MLKit-based CodeScanner component,...
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> ## Documentation Index
> Fetch the complete documentation index at: https://daily.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# QR and Barcode Scanning in React Native with VisionCamera V5

**[Nitro Modules](https://daily.dev/sources/margelo)** · 13 min read · 0 upvotes · 0 comments

## Summary

A step-by-step production guide to scanning QR codes and barcodes in React Native using VisionCamera V5, covering the MLKit-based CodeScanner component, useBarcodeScannerOutput for combining scanning with other camera outputs, frame processors for full custom control including overlay drawing, and the iOS-only CameraObjectOutput that uses Apple's native AVCaptureMetadataOutput without MLKit. Includes installation steps, permission setup, resolution tuning, supported barcode formats, and a list of common gotchas like slow scans from using 'all-formats' or coordinate mismatches when drawing bounding boxes.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://margelo.com/blog/react-native-qr-barcode-scanner-visioncamera-v5>

## Questions this post answers

### How do I scan QR codes in React Native using VisionCamera V5?

Use the CodeScanner component from the react-native-vision-camera-barcode-scanner package, which renders a full camera preview and runs MLKit detection internally without needing a separate Camera instance. Pass isActive, barcodeFormats (e.g. ['qr-code']), and an onBarcodeScanned callback that receives detected barcodes with their rawValue, and pair isActive with useIsFocused() to avoid burning battery when the screen isn't visible.

_daily.dev surfaces guides like this for developers wiring up camera scanning in React Native apps._

### What is the difference between VisionCamera's CameraObjectOutput and the MLKit barcode scanner?

CameraObjectOutput uses Apple's built-in AVCaptureMetadataOutput and works iOS-only with no MLKit dependency, detecting barcodes plus faces, human and pet bodies, and salient objects, but only returns raw payloads without semantic parsing. The MLKit-based barcode scanner works on both iOS and Android and adds a valueType field that parses URLs, Wi-Fi credentials, and vCards automatically.

_weighing native versus cross-platform detection options is easier when tracking VisionCamera updates on daily.dev._

### Why is my VisionCamera barcode scanner running slowly?

Slow scanning is usually caused by setting barcodeFormats to ['all-formats'], which forces MLKit to run decoders for every supported format instead of just the ones needed. Narrowing barcodeFormats to specific types like ['qr-code'] noticeably speeds up detection and reduces false positives on lookalike codes; for dense codes like PDF-417, set outputResolution to 'full' instead if accuracy, not speed, is the issue.

_debugging performance gotchas like this is simpler when React Native scanning tips surface on daily.dev._

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---

Tags: [#mobile](https://daily.dev/tags/mobile), [#ios](https://daily.dev/tags/ios), [#react-native](https://daily.dev/tags/react-native)

[View this post on daily.dev](https://daily.dev/posts/qr-and-barcode-scanning-in-react-native-with-visioncamera-v5-mnniglptv)

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