NextAuth.js vs Firebase Auth

At a Glance

NextAuth.js

Firebase Auth

NextAuth.js

Pros

Completely free and open source — no MAU limits, no pricing tiers, no vendor lock-in regardless of how large your app grows+184
Deep Next.js integration means session is available server-side in getServerSideProps, API routes, and App Router with minimal setup+162
Huge community and ecosystem means every common provider (Google, GitHub, Discord) has a working example you can copy+138
You own your session data since it stores in your own database — GDPR compliance is much simpler when you control everything+119

Cons

The configuration is complex and the documentation has gaps that require reading source code or GitHub issues to resolve edge cases

Authentication

Supabase Auth vs Firebase Auth

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