Accessible MFA

Accessible MFA sits at the heart of authentication accessibility in authentication. This guide walks through the concept step by step, with examples, a cheatsheet, and common mistakes to avoid.

Accessible MFA Overview

Accessible MFA is a building block you will reach for often in authentication. It keeps related logic together and makes your intent obvious to reviewers and future maintainers.

When you learn accessible mfa properly, you avoid the guesswork that leads to bugs and rework. The example below shows the shape you will use in most real authentication projects.

import { authenticator } from 'otplib';

// enrolment: show this secret as a QR code
const secret = authenticator.generateSecret();
const uri = authenticator.keyuri(user.email, 'MyApp', secret);

// verification at login
const isValid = authenticator.verify({ token: userCode, secret });

TOTP-based MFA generates a shared secret and verifies rotating 6-digit codes.

Accessible MFA Example

// verify the caller on every protected request
function authenticate(req, res, next) {
  const token = req.headers.authorization?.replace('Bearer ', '');
  req.user = verifyToken(token); // throws if invalid
  next();
}

Start from a minimal Accessible MFA example and grow it only as needed.
Keep configuration explicit so Accessible MFA behaves the same in every environment.
Name things clearly so teammates understand your Accessible MFA at a glance.
Add tests around Accessible MFA early to lock in expected behaviour.

Authentication Cheatsheet

Quick authentication reference related to accessible mfa.

Concept	Example	Purpose
Hash password	`bcrypt.hash(pw, 12)`	Store credentials safely
Issue JWT	`jwt.sign(claims, secret)`	Stateless access token
Verify JWT	`jwt.verify(token, secret)`	Trust the caller
Session	`req.session.userId = id`	Server-side login state
Cookie	`httpOnly, secure, sameSite`	Protect the session token
Authorize	`requireRole('admin')`	Control what users can do
MFA	`authenticator.verify(...)`	Add a second factor

How Accessible MFA Works

Accessible MFA is part of proving who a user is and what they are allowed to do. Authentication verifies identity, while authorization decides access — and accessible mfa plays a specific role in that flow.

TOTP-based MFA generates a shared secret and verifies rotating 6-digit codes.

Never store or log plain-text passwords or secrets.
Prefer short-lived tokens with refresh over long-lived ones.
Always send credentials over HTTPS.
Fail closed: deny access when anything is uncertain.

Security Guidance for Accessible MFA

Security is the whole point of accessible mfa. Small mistakes — weak hashing, tokens in localStorage, missing rate limits — are exactly what attackers look for, so follow proven defaults.

Risk	Mitigation
Credential theft	Strong hashing, MFA, HTTPS only
Token leakage	httpOnly cookies, short TTLs
Brute force	Rate limiting and lockouts
Privilege abuse	Least-privilege authorization checks

Common Mistakes

Skipping error handling and edge cases when wiring up accessible mfa.
Leaving accessible mfa untested, so regressions slip into production.
Over-engineering accessible mfa before you actually need the extra flexibility.
Ignoring documentation, which makes accessible mfa hard for the next developer to change.

Key Takeaways

Accessible MFA is a core part of working effectively with authentication.
Start small and keep accessible mfa focused on a single responsibility.
Apply consistent patterns so accessible mfa scales across your project.
Test and document accessible mfa to keep it maintainable over time.

Pro Tip

Pair accessible mfa with automated tests from day one. It is far cheaper to catch authentication regressions in CI than in production.