FileReader: FileReader() constructor
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
Note: This feature is available in Web Workers.
The FileReader() constructor creates a new FileReader.
For details about how to use FileReader, see Using files from web applications.
Syntax
js
new FileReader()
Parameters
None.
Examples
The following code snippet shows creation of a FileReader object using the FileReader() constructor and subsequent usage of the object:
js
function printFile(file) {
const reader = new FileReader();
reader.onload = (evt) => {
console.log(evt.target.result);
};
reader.readAsText(file);
}
Specifications
| Specification |
|---|
| File API # filereaderConstrctr |
Browser compatibility
| desktop | mobile | server | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
FileReader() constructor
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Legend
Tip: you can click/tap on a cell for more information.
- Full support
- Full support