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Auth Done Right: Authentication Strategies for MVPs

Auth Done Right: Authentication Strategies for MVPs

When to use social login, magic links, or email/password — and how to avoid common auth mistakes in early-stage products.

Auth Done Right: Authentication Strategies for MVPs

Authentication is one of those features that feels simple but has a hundred ways to go wrong. Choosing the wrong approach adds complexity, frustrates users, and occasionally creates security problems you didn't anticipate.

For an MVP, the goal is simple: get users in the door securely and quickly, without building a custom auth system from scratch.

The Rule: Don't Build Auth Yourself

If you take away one thing from this article, let it be this: don't roll your own authentication.

Custom auth systems require you to handle password hashing, secure session management, brute-force protection, account recovery flows, and token rotation correctly. Each of these has well-documented attack vectors. Getting any one wrong creates real vulnerabilities.

Use an existing auth provider. Firebase Authentication, Supabase Auth, Auth0, and Clerk all handle this correctly so you don't have to. You configure, they secure.

Choosing Your Auth Method

Different products suit different authentication methods. Here's how to think about it.

Email + Password

The classic. Users enter an email and password, you store a hashed password, they log in with credentials.

Use when:

  • Your audience is less tech-savvy and expects traditional login forms
  • You're building a B2B product where corporate email addresses are important
  • Your product doesn't have strong mobile usage

Watch out for:

  • Users reuse weak passwords — not your problem unless you have a data breach
  • Requires a password reset flow (email-based) from day one
  • Higher friction than alternatives

User enters their email. They receive a one-time link. They click it and they're in. No password required.

Use when:

  • You want lower friction at signup
  • Your users are comfortable with email-based workflows
  • You're building a tool where sessions are longer and re-authentication is infrequent

Watch out for:

  • Slower login flow — requires opening email
  • Doesn't work well if users frequently switch devices or use shared inboxes
  • Can fail with strict email filters in corporate environments

Social Login (Google, GitHub, LinkedIn)

Users authenticate with an existing third-party account. No new credentials to remember.

Use when:

  • Speed of signup matters (consumer products, developer tools)
  • You're building for a specific audience with a dominant platform (GitHub for devs, Google for most others)
  • You want verified email addresses without sending verification emails yourself

Watch out for:

  • Users who don't have or don't want to use the social account you support
  • Account recovery is tied to the third-party provider
  • Some enterprise users can't or won't use personal Google accounts

The MVP-Optimal Setup

For most MVPs, the winning combination is:

  1. Google OAuth as the primary option — high conversion, low friction, email verified automatically
  2. Email + password as a fallback — for users who won't use social login
  3. No username/password complexity requirements for v1 — just enforce minimum length

Skip magic links, GitHub OAuth, and multi-factor authentication for your first version. Add them when user feedback or security requirements demand them.

Firebase Auth Implementation Patterns

If you're using Firebase (which we recommend for most early-stage products), here's what works:

// Google sign-in — two lines of code
import { signInWithPopup, GoogleAuthProvider } from 'firebase/auth'

const provider = new GoogleAuthProvider()
await signInWithPopup(auth, provider)

Firebase handles token refresh, session persistence, and secure storage automatically. Your Firestore security rules can reference request.auth.uid directly, making per-user data isolation simple.

Protected Routes in Nuxt

Once auth is in place, protect your routes with a middleware:

// middleware/auth.ts
export default defineNuxtRouteMiddleware(() => {
  const user = useCurrentUser()
  if (!user.value) {
    return navigateTo('/login')
  }
})

Apply it selectively (definePageMeta({ middleware: 'auth' })) rather than globally — your marketing pages, blog, and public content shouldn't require authentication.

What to Skip Until You Need It

  • Two-factor authentication (2FA) — add when users or compliance require it
  • SSO / SAML — an enterprise feature; relevant only when enterprise customers ask
  • Phone number auth — useful for specific use cases (gig economy, booking platforms), not a default
  • Custom JWT handling — let your auth provider manage tokens; don't decode or manipulate them manually unless there's a specific reason

Authentication is one area where boring is better. Use a trusted provider, configure it correctly, and focus your engineering time on your actual product.

If you want auth set up correctly as part of a complete MVP build, let's talk.

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