What is the best way to extract the primary base64 value from reader.result?

Question

What is the best way to extract the primary base64 value from reader.result?

After successfully retrieving the base64 value of my file, I noticed that along with the value, I am also getting the type of file and the type of string. However, I only require the actual value in order to send it to the backend.

Code for converting file to base64

handleUpload(e) {
  var reader = new FileReader();
  const file = (e.target as HTMLInputElement).files[0];
  reader.readAsDataURL(file);
  reader.onload = () => {
    console.log(reader.result as string);
  };
}

https://i.sstatic.net/Oc82s.png

I specifically need the value beginning from 'U' after the word 'base64.'

javascript angular typescript base64

Answer 1

Answer №1

To simplify the process, you can utilize a RegExp like this:

reader.result.replace(/^.+?;base64,/, '')

However, it's worth considering uploading the binary file directly instead of converting it to base64 first.

const file = (e.target as HTMLInputElement).files[0];
const body = new FormData;
body.append('file', file);
fetch('/end-point', {
  method: 'POST',
  body
});

This approach is quicker and more efficient since binary files are smaller in size compared to base64-encoded files, and there's no need to wait for the client to perform the conversion.

Answer 2

To simplify the process, you can utilize a RegExp like this:

reader.result.replace(/^.+?;base64,/, '')

However, it's worth considering uploading the binary file directly instead of converting it to base64 first.

const file = (e.target as HTMLInputElement).files[0];
const body = new FormData;
body.append('file', file);
fetch('/end-point', {
  method: 'POST',
  body
});

This approach is quicker and more efficient since binary files are smaller in size compared to base64-encoded files, and there's no need to wait for the client to perform the conversion.

What is the best way to extract the primary base64 value from reader.result?

Answer №1

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