The FileReader error property returns the error that occurred while reading the file. 
 The FileReader error property returns the error that occurred while reading the file. 
A DOMException containing the relevant error.
| Specification | 
|---|
| File API  # dom-filereader-error  | 
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
error | 
6 | 12 | 3.6["Before Firefox 13, theerror property returned a FileError object.", "From Firefox 13 to Firefox 58, the error property returned a DOMError object.", "From Firefox 58, the error property returns a DOMException object."] | 
10Theerror property returns a DOMError object. | 
11 | 6Theerror property returns a DOMError object. | 
3 | 18 | 32["From Firefox 32 to Firefox 58, theerror property returned a DOMError object.", "From Firefox 58, the error property returns a DOMException object."] | 
11 | 6Theerror property returns a DOMError object. | 
1.0 | 
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    https://developer.mozilla.org/en-US/docs/Web/API/FileReader/error