Auth.js

Open-source authentication library (formerly NextAuth.js) for Next.js, SvelteKit, Express and other frameworks, with OAuth providers, email links and database adapters.

Visit authjs.dev ↗Pricing & calculator Alternatives

Ask your AI about this, with this page as the source:ChatGPT ↗Claude ↗Perplexity ↗

Where it fits

Authentication · Library in your appExisting Next.js apps built on NextAuth, and teams that want OAuth sign-in with users in their own database.Trade-off: The project is now part of Better Auth, which offers a migration guide; v5 has stayed in beta for a long time, and features like two-factor or organizations are yours to build.

How Auth.js itself is built

4 tools, from its own code, website and Product Hunt page.

Who uses it

No maker's live product on record yet, and 57 open-source projects that declare it in their code.

Declared in code 57How evidence is collected →

We haven't found a maker's live product that uses Auth.js yet — only the open-source projects below, which declare it in their code.

Sort

alga-psa An open source MSP PSA from Nine MindsAuthenticationIn its code · source ↗

atom Atom Agent, Open-Source Governed AI Agent Platform for Self-Hosted AutomationAuthenticationIn its code · source ↗

examples Enjoy our curated collection of examples and solutions. Use these patterns to build your…AuthenticationIn its code · source ↗

JamAIBase The collaborative spreadsheet for AI. Chain cells into powerful pipelines, experiment wi…AuthenticationIn its code · source ↗

kodus-ai AI Code Review with Full Control Over Model Choice and Costs.AuthenticationIn its code · source ↗

typebot.io 💬 Typebot is a powerful chatbot builder that you can self-host.AuthenticationIn its code · source ↗

sourcebot Sourcebot is a self-hosted tool that helps humans and agents understand your codebase.AuthenticationIn its code · source ↗

tambo Generative UI SDK for ReactAuthenticationIn its code · source ↗

Cal.com Open-source scheduling platform: a Calendly alternative you can self-host or use hosted,…AuthenticationIn its code · source ↗

Langfuse Open-source LLM engineering platform for tracing, evaluation, prompt management and expe…AuthenticationIn its code · source ↗

papermark Open-source document sharing and virtual data room with viewer analytics and custom doma…AuthenticationIn its code · source ↗

OpenStatus Open-source, self-hostable status page and uptime/API monitoring tool, defined as code.AuthenticationIn its code · source ↗

neuronpedia open source interpretability platform 🧠AuthenticationIn its code · source ↗

ever-teams Ever® Teams™ - The Workplace for Humans. Open Work & Productivity Platform - https://eve…AuthenticationIn its code · source ↗

Dub Open-source link management and attribution platform for short links, conversion trackin…AuthenticationIn its code · source ↗

jitsu Jitsu is an open-source Segment alternative. Fully-scriptable data ingestion engine for…AuthenticationIn its code · source ↗

cal.diy Scheduling infrastructure for absolutely everyone.AuthenticationIn its code · source ↗

eve The Open Framework for Building AgentsAuthenticationIn its code · source ↗

labelflow The open platform for image labellingAuthenticationIn its code · source ↗

letterpad A publishing platform for creative people.AuthenticationIn its code · source ↗

mcpauth Authentication for MCP ServersAuthenticationIn its code · source ↗

quenti The open source Quizlet alternative.AuthenticationIn its code · source ↗

tianji Tianji: Insight into everything, Website Analytics + Uptime Monitor + Server Status. not…AuthenticationIn its code · source ↗

Open source: a project that declares Auth.js as a dependency in its public code — verifiable, but not necessarily a live product.

Reliability and open issues

Most wanted on GitHub

Cannot modify JWT to refresh access_token👍 27 · opened Jan 2025 · active Nov 2025
Authjs v5 redirecting to the wrong URL👍 19 · opened May 2024 · active Sep 2026

Open on 2026-10-04 in nextauthjs/next-auth, with activity in the last year — issues and feature requests by 👍.

Alternatives to Auth.js

All alternatives by situation →

Better AuthTypeScript apps that want users and sessions in their own database, at no cost.Open sourceFree tier6 makers · authentication Compare with Auth.js →

ClerkDropping prebuilt sign-in, profile and organization UI into a React or Next.js app.Free tier307 makers · authentication

SupabaseApps already on Supabase — auth is part of the same project as the database.Open sourceFree tier13 makers · authentication

FirebaseMobile and client-heavy apps already using Firebase.Free tier4 makers · authentication

WorkOSB2B SaaS that will need enterprise SSO and directory sync.Free tier19 makers · authentication

Auth0Complex identity needs and enterprise compliance.Free tier21 makers · authentication

KeycloakA self-hosted identity server with SSO, OpenID Connect, SAML and user federation for several apps at once.Open sourceFree tier3 makers · authentication

Hexclave (Stack Auth)A Clerk-style developer experience you can also self-host.Open sourceFree tier2 makers · authentication

LogtoOpen-source OIDC auth with hosted sign-in pages, organizations and roles, on a cloud with 50,000 free monthly active users or on your own servers.Open sourceFree tier2 makers · authentication

Questions makers ask about Auth.js

Is Auth.js free?

Yes — it is free, open-source software.

Is Auth.js open source or self-hostable?

Open source, and you can self-host it. source ↗

Can AI coding agents work with Auth.js?

No llms.txt, official MCP server or CLI found yet.

Who uses Auth.js?

No maker's live product we track yet; 57 open-source projects declare it in their code. source ↗