@strongnguyen/oidc-provider/lib/helpers/redirect_uri.js

OAuth 2.0 Authorization Server implementation for Node.js with OpenID Connect

const url = require('url');
const querystring = require('querystring');

module.exports = function redirectUri(uri, payload, mode) {
  const parsed = url.parse(uri, true);

  parsed.search = null;

  // handles a case where url module adds unintended / to the pathname
  // i.e. http://www.example.com => http://www.example.com/
  if (parsed.pathname === '/' && !uri.endsWith('/')) parsed.pathname = null;

  switch (mode) {
    case 'fragment':
      parsed.hash = querystring.stringify(payload);
      break;
    default:
      Object.assign(parsed.query, payload);
      break;
  }

  return url.format(parsed);
};