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grateful-journal/docs/auth-options-vite-react.md
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Auth options for Vite + React (SPA)

In Next.js, NextAuth.js (now Auth.js) is the standard: it gives you OAuth (Google, GitHub, etc.), sessions, callbacks, and JWT/cookies on the server.

For a Vite + React app (client-side SPA), there is no single “NextAuth for Vite.” You pick by how much you want to host yourself vs use a service.


1. Firebase Authentication (what this project uses)

  • What it is: Googles auth service; add SDK, configure providers (e.g. Google), get sign-in in the browser.
  • Pros: Free tier, no backend required for basic “Sign in with Google,” works great with Vite + React.
  • Cons: Youre tied to Firebase; for custom session logic you still need your own backend.
  • Use when: You want the fastest “Sign in with Google” (or email link, etc.) with no backend.

2. Clerk

  • What it is: Hosted auth (like Auth0) with pre-built React components and APIs.
  • Pros: Drop-in <SignIn /> / <SignUp />, many providers, user management dashboard, works with any frontend (including Vite + React).
  • Cons: Paid after free tier; vendor lock-in.
  • Use when: You want a “NextAuth-like” experience (components + dashboard) without running your own auth server.

3. Auth0 (Okta)

  • What it is: Hosted identity platform; SDK + hosted login pages or embedded UI.
  • Pros: Enterprise-ready, many providers, fine-grained controls.
  • Cons: Can be heavy and costly for small apps.
  • Use when: You need enterprise features or already use Okta.

4. Supabase Auth

  • What it is: Auth layer from Supabase (DB + realtime + storage).
  • Pros: Google, magic link, email/password; integrates with Supabase DB and RLS.
  • Cons: Makes most sense if you use Supabase for data.
  • Use when: Your backend (or “BaaS”) is Supabase.

5. Auth.js (formerly NextAuth) + your own backend

  • What it is: The same library NextAuth uses; you run it on Express, Fastify, or another Node server. Your Vite app is just a client that talks to that API.
  • Pros: Full control, sessions/callbacks like in Next.js, same mental model as NextAuth.
  • Cons: You build and run the backend; CORS and cookie/session handling for SPA.
  • Use when: You want “NextAuth” behavior (sessions, callbacks, multiple providers) with an Express (or similar) API and a Vite React frontend.

Summary

Need Good fit
“Sign in with Google” only Firebase Auth
Pre-built UI + dashboard Clerk
Backend is Supabase Supabase Auth
NextAuth-style + Express Auth.js on Express

This app uses Firebase Auth for a simple, backend-free Google sign-in that works well with Vite + React.