I tested every major auth library for Next.js in 2026: Here’s what you should use

A recent thread on r/nextjs sparked a discussion about the best authentication library for a Next.js project, with recommendations including NextAuth, Clerk, and custom solutions. However, the landscape has changed with Auth.js v5's release in late 2024, Better Auth's launch in early 2025, and Clerk's updated free tier. WorkOS also emerged as a competitive option for B2B applications needing SSO. The confusion arises from outdated comparison articles and a CVE disclosure showing vulnerabilities in middleware-only session protection in Next.js. This article tests four libraries—Auth.js v5, Clerk, WorkOS, and Better Auth—against a Next.js 16 project, evaluating them on integration, session mechanics, OAuth setup, middleware protection, and edge runtime behavior. Auth.js v5 offers maximum control but is in maintenance mode, Clerk provides fast setup but involves vendor lock-in, WorkOS is tailored for enterprise SSO, and Better Auth offers full data ownership with the responsibility of managing infrastructure. The conclusion suggests Better Auth for self-hosted projects, Clerk for quick B2C app deployments, and WorkOS for enterprise SSO needs, while Auth.js v5 remains a transition option for existing codebases.

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