Open-Source IAM
Auth.js (NextAuth.js)
Capability scores
Methodology →- Authentication
- 4.5
- SSO & Federation
- 4.5
- Authorization
- 4.0
- Lifecycle & Provisioning
- 3.5
- MFA & Passwordless
- 4.0
- Governance & Audit
- 2.5
- Developer Experience
- 4.5
- Deployment Flexibility
- 4.5
- Pricing Transparency
- 5.0
- Support & Ecosystem
- 3.5
Scored 0–5 against a published rubric. Independent analysis, no vendor sponsorship.
Overview
Auth.js, formerly NextAuth.js, is a widely used open-source authentication library for Next.js and JavaScript applications, with many built-in identity providers.
Capability deep-dive
Ease of use, broad provider support, and ubiquity in the Next.js ecosystem are the strengths. It is a library you wire into your app, so enterprise SSO, provisioning, and governance are not its focus.
Pricing
Free and open source.
Bottom line
The default auth library for many Next.js apps, not a managed enterprise platform.
Independent editorial review. Author: Deepak Gupta. Last evaluated 2026-06-10.