React Native 0.82 Fetch Issues fetching local file
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Description
Description
When trying to fetch a file from the device and turn it into a blob with default fetch shipped within RN 0.82.0, fetch issues a TypeError. Also other methods to fetch the file from the device fail.
The code used for this:
const response = await fetch(image.path)
const blob = await response.blob()
Response:
Error: Uncaught (in promise, id: 1): "TypeError: Network request failed"
I used to used this throughout all RN versions I previously used and it doesnt work since upgrading from 0.73.6 to 0.82.0.
If I implement it with the formdata approach that I find on multiple sources, the upload succeeds but I get corrupted files.
const formData = new FormData()
formData.append('file', {
type: mime.getType(image.path),
uri: image.path,
name: image.fileName,
});
If I use the XMLHttpRequest approach I get errors as well.
To me it seems something changed regarding to accessing files/uri's on a device, yet I find 0 sources on it.
I changed all necessary permissions to match current latest approach.
I also added a reproducer with all 3 of the methods I described.
You will need an endpoint to upload a file for the reproducer.
Does anybody know what I am doing wrong?
Steps to reproduce
- install packages
- start app
- supply an api url to the fetch methods
- pick an image
- press upload image
React Native Version
0.82.0
Affected Platforms
Runtime - Android
Output of npx @react-native-community/cli info
System:
OS: macOS 15.5
CPU: (8) arm64 Apple M2
Memory: 137.97 MB / 8.00 GB
Shell:
version: "5.9"
path: /bin/zsh
Binaries:
Node:
version: 24.6.0
path: /Users/alexander/.nvm/versions/node/v24.6.0/bin/node
Yarn:
version: 1.22.22
path: /Users/alexander/.nvm/versions/node/v24.6.0/bin/yarn
npm:
version: 11.5.1
path: /Users/alexander/.nvm/versions/node/v24.6.0/bin/npm
Watchman:
version: 2024.04.01.00
path: /opt/homebrew/bin/watchman
Managers:
CocoaPods:
version: 1.14.3
path: /usr/local/bin/pod
SDKs:
iOS SDK:
Platforms:
- DriverKit 24.4
- iOS 18.4
- macOS 15.4
- tvOS 18.4
- visionOS 2.4
- watchOS 11.4
Android SDK:
API Levels:
- "31"
- "33"
- "34"
- "35"
- "36"
Build Tools:
- 30.0.3
- 33.0.0
- 33.0.1
- 34.0.0
- 35.0.0
- 36.0.0
System Images:
- android-34 | Google APIs ARM 64 v8a
Android NDK: Not Found
IDEs:
Android Studio: 2024.1 AI-241.18034.62.2411.12169540
Xcode:
version: 16.3/16E140
path: /usr/bin/xcodebuild
Languages:
Java:
version: 17.0.10
path: /usr/bin/javac
Ruby:
version: 2.6.10
path: /usr/bin/ruby
npmPackages:
"@react-native-community/cli":
installed: 20.0.0
wanted: 20.0.0
react:
installed: 19.1.1
wanted: 19.1.1
react-native:
installed: 0.82.0
wanted: 0.82.0
react-native-macos: Not Found
npmGlobalPackages:
"*react-native*": Not Found
Android:
hermesEnabled: true
newArchEnabled: true
iOS:
hermesEnabled: true
newArchEnabled: true
Stacktrace or Logs
Error: Uncaught (in promise, id: 1): "TypeError: Network request failed"
at onUnhandled (&platform=android&dev=true&lazy=true&minify=false&app=com.awesomeproject&modulesOnly=false&runModul…:22082:59)
at onUnhandled (address at InternalBytecode.js:1:3386)Caused by: TypeError: Network request failed
at anonymous (&platform=android&dev=true&lazy=true&minify=false&app=com.awesomeproject&modulesOnly=false&runModul…:24029:33)
MANDATORY Reproducer
https://github.com/IR-Baboon/reproducer
Screenshots and Videos
No response
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the linked reproducer and run its three upload methods on Android with React Native 0.82.0, using an upload endpoint as described. Compare the same local-file fetch and blob behavior with the reported 0.73.6 version. Done means identifying the changed file-URI behavior and confirming that local-file upload works or documenting the supported limitation.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- android, react-native
- Domain
- mobile
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Quiet
- Clarity
- Needs clarification
- Newbie friendliness
- 42/100