React-native-fs: Error: no protocol, unSupported URL

[RUIFERNANDE5]

Hey, I've been struggling in the last couple of hours trying to solve this but I just can't.
So, I'm generating a vcf file (VCard) and saving it on DocumentDirectoryPath (so far so good),
then I save the file path: (Example: /data/user/0/com.appName/files/Test-ABC.vcf.

Now, I want to be able to download this file, but it keeps giving me this errors.

On Android:

Error: no protocol: /data/user/0/com.appName/files/Test-ABC.vcf
    at createErrorFromErrorData (NativeModules.js:116)
    at NativeModules.js:79
    at MessageQueue.__invokeCallback (MessageQueue.js:288)
    at MessageQueue.js:127
    at guard (MessageQueue.js:46)
    at MessageQueue.invokeCallbackAndReturnFlushedQueue (MessageQueue.js:126)
    at debuggerWorker.js:71

On iOS:

Error: unsupported URL
    at createErrorFromErrorData (NativeModules.js:116)
    at NativeModules.js:79
    at MessageQueue.__invokeCallback (MessageQueue.js:288)
    at MessageQueue.js:127
    at guard (MessageQueue.js:46)
    at MessageQueue.invokeCallbackAndReturnFlushedQueue (MessageQueue.js:126)
    at debuggerWorker.js:71

ExceptionsManager.js:71 RCTJSONStringify() encountered the following error: Invalid type in JSON write (NSURL)

My code:

const downloadDest = `${RNFS.DocumentDirectoryPath}/${props.shareOptions.filename}.vcf`;

RNFS.downloadFile({ fromUrl: props.shareOptions.url, toFile: downloadDest, headers })
.promise.then(res => {
    // it does not enter here
    RNFetchBlob.fs.scanFile([ { path : downloadDest, mime : 'text/vcard' } ])
    .then(() => {
      console.log("scan file success")
    })
    .catch((err) => {
      console.log("scan file error")
    })
    return RNFS.readFile(downloadDest, 'utf8');
}).then(content => {
    const headers = JSON.parse(content);
    console.log(headers);
}).catch(err => console.log(err));

Any help would be really appreciated. Thanks in advance

[itinance]

Are you sure that this happens with "RNFS.downloadFile" and not with "RNFetchblob.fs.scanfile"?
I would suggest to console.log the input parameters as well

[RUIFERNANDE5]

@itinance yes, as the the comment on the above code says , it does not even enter there. Plus I tried without the scan file.
Could it be permissions missing? Would that be the shown messages? Didn't find any permissions on the docs

[itinance]

Which version are you using? The explicit ".promise"-Property is not necessary anymore and would fail with new releaseses?

[RUIFERNANDE5]

"dependencies": {
    "react": "~15.4.1",
    "react-native": "0.42.0",
    "react-native-fs": "^2.3.2"
}"

The error still persists if I remove the promise and then / catch.

RNFS.downloadFile({ fromUrl: props.shareOptions.url, toFile: downloadDest, headers })

Would you give me an example how to implement the "then" after downloadFile without the promise?

I wonder why does the ExceptionsManager.js:71 RCTJSONStringify() encountered the following error: Invalid type in JSON write (NSURL) is only triggered on iOS?

[CarterBland]

@RUIFERNANDE5 Did you ever find a solution to this? I am experiencing this too, but I'm not sure where I'm even using native modules.

[greenimpala]

encodeURI(`file://${RNFS.DocumentDirectoryPath}/my-download.pdf`)