pkce-js/src/index.ts

Generate PKCE verifier and code_challenge in a simple way.

import { randomString, base64Url, b64Sha256Hash } from './helpers';

function createVerifier(length: number = 128): string {
  if (length < 43 || length > 128) {
    throw new Error(
      `Verifier has to be between 43 and 128 characters. Recieved: ${length}`
    );
  }

  return randomString(length);
}

function createChallenge(verifier: string): string {
  return base64Url(b64Sha256Hash(verifier));
}

export function pkce(length: number = 128): {
  verifier: string;
  challenge: string;
} {
  const verifier = createVerifier(length);
  const challenge = createChallenge(verifier);

  return {
    verifier: verifier,
    challenge: challenge,
  };
}