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.
new FileReader()None.
The following code snippet shows creation of a FileReader object using the FileReader() constructor and subsequent usage of the object:
function printFile(file) {
const reader = new FileReader();
reader.onload = (evt) => {
console.log(evt.target.result);
};
reader.readAsText(file);
}