Returns the error that occurred while reading the file.
var error = instanceOfFileReader.error
A DOMError containing the relevant error. In Chrome 48+/Firefox 58+ this property returns a DOMException because DOMError has been removed from the DOM standard.
| Specification | Status | Comment |
|---|---|---|
| File API The definition of 'FileReader' in that specification. | Working Draft | Initial definition |
| Feature | Firefox (Gecko) | Chrome | Edge | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | 3.6 (1.9.2)[1] | 7 | (Yes) | 10[2] | 12.02[3] | 6.0.2 |
DOMException value instead of DOMError
| 58 (58) | 48 | (Yes) | No support | (Yes) | No support |
| Feature | Firefox Mobile (Gecko) | Android | Edge | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | 32 | 3 | (Yes) | 10 | 11.5 | 6.1 |
DOMException value instead of DOMError
| 58.0 (58) | (Yes) | No support | (Yes) | No support |
[1] Prior to Gecko 2.0 beta 7 (Firefox 4.0 beta 7), all Blob parameters below were File parameters; this has since been updated to match the specification correctly. Prior to Gecko 13.0 (Firefox 13.0 / Thunderbird 13.0 / SeaMonkey 2.10) the FileReader.error property returned a FileError object. This interface has been removed and FileReader.error is now returning the DOMError object as defined in the latest FileAPI draft.
[2] IE9 has a File API Lab.
[3] Opera has partial support in 11.1.
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https://developer.mozilla.org/en-US/docs/Web/API/FileReader/error