Use Recovery Codes

Use Recovery Codes sits at the heart of recovery codes in authentication. This guide walks through the concept step by step, with examples, a cheatsheet, and common mistakes to avoid.

Use Recovery Codes Overview

Use Recovery Codes lets you structure authentication work so it stays readable, testable, and easy to scale. Instead of ad-hoc code, you follow a clear pattern that other developers can recognise immediately.

The key is to keep use recovery codes focused and predictable. Start from the minimal example here, then layer in only the complexity your feature actually needs.

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.

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

Authentication Cheatsheet

Quick authentication reference related to use recovery codes.

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 Use Recovery Codes Works

Use Recovery Codes is part of proving who a user is and what they are allowed to do. Authentication verifies identity, while authorization decides access — and use recovery codes 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 Use Recovery Codes

Security is the whole point of use recovery codes. 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 use recovery codes.
Leaving use recovery codes untested, so regressions slip into production.
Over-engineering use recovery codes before you actually need the extra flexibility.
Ignoring documentation, which makes use recovery codes hard for the next developer to change.

Key Takeaways

Use Recovery Codes is a core part of working effectively with authentication.
Start small and keep use recovery codes focused on a single responsibility.
Apply consistent patterns so use recovery codes scales across your project.
Test and document use recovery codes to keep it maintainable over time.

Pro Tip

When you get stuck on use recovery codes, reduce it to the smallest reproducible example first — most authentication issues become obvious once the noise is gone.