packages/browser/src/helpers/bufferToBase64URLString.ts


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/**
 * Convert the given array buffer into a Base64URL-encoded string. Ideal for converting various
 * credential response ArrayBuffers to string for sending back to the server as JSON.
 *
 * Helper method to compliment `base64URLStringToBuffer`
 */
export default function bufferToBase64URLString(buffer: ArrayBuffer): string {
  const bytes = new Uint8Array(buffer);
  let str = '';

  for (const charCode of bytes) {
    str += String.fromCharCode(charCode);
  }

  const base64String = btoa(str);

  return base64String
    .replace(/\+/g, '-')
    .replace(/\//g, '_')
    .replace(/=/g, '');
}