Reading file contents from file input via FileReader

onDrop.js

/**
* Source: https://react-dropzone.js.org/
*/
const onDrop = () => (acceptedFiles) => {
  acceptedFiles.forEach((file) => {
    const reader = new FileReader()

    reader.onabort = () => console.log('file reading was aborted')
    reader.onerror = () => console.log('file reading has failed')
    reader.onload = () => {
    // Do whatever you want with the file contents
      const binaryStr = reader.result
      console.log(binaryStr)
    }
    reader.readAsArrayBuffer(file)
  })
}

// Call onDrop on input change event