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Stack Auth: The Open-Source Auth Platform

Stack Auth is a managed user authentication solution that’s developer-friendly and fully open-source (licensed under MIT and AGPL). Get started in just five minutes and scale as your project grows.

Quick Start

Get authentication running in your Next.js app in under 5 minutes

Installation

Detailed installation instructions for Next.js, React, and JavaScript

API Reference

Complete REST API documentation for custom integrations

Components

Pre-built UI components for sign-in, sign-up, and account settings

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Why Stack Auth?

Stack Auth combines the best of both worlds: the convenience of a managed service with the freedom of open-source software.

Fully Open Source

MIT and AGPL licensed. Export your user data and self-host at any time, for free.

Developer-Friendly

Idiomatic Next.js APIs built on server components, React hooks, and route handlers.

Production-Ready

Complete authentication and user management out of the box.

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Key Features

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Authentication Components

Pre-built <SignIn/> and <SignUp/> components that support:
  • OAuth - Google, GitHub, Microsoft, and more with shared development keys
  • Password credentials - Traditional email/password authentication
  • Magic links - Passwordless email authentication
  • Passkeys - Biometric and security key authentication
  • Dark/light mode - Automatic theme support

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User Management

User Dashboard

Filter, analyze, and edit users. Replaces the first internal tool you’d build.

Account Settings

Let users update profiles, verify emails, and change passwords - zero setup required.

Multi-Tenancy & Teams

B2B customer management with organizations that scale to millions.

Role-Based Access Control

Define permission graphs and assign to users. Org-specific roles supported.

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Advanced Features

  • OAuth Connections - Manage access tokens for third-party APIs (Google Calendar, Outlook, etc.)
  • Webhooks - Get notified when users interact with your product (built on Svix)
  • Automatic Emails - Customizable emails for sign-up, password reset, and verification
  • JWT Handling - Automatic management of refresh tokens, access tokens, and cookies
  • M2M Authentication - Short-lived access tokens for machine-to-machine communication
  • User Impersonation - Debug and support by logging in as users

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Framework Support

import { StackServerApp } from "@stackframe/stack";

export const stackServerApp = new StackServerApp({
  tokenStore: "nextjs-cookie",
});

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What Makes Stack Auth Different?

Ask yourself about other auth solutions:
  • Is it open-source?
  • Is it developer-friendly, well-documented, and lets you get started in minutes?
  • Does it do authentication, authorization, and user management?
If you answered “no” to any of these questions, that’s how Stack Auth is different.

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Get Started

5-Minute Quickstart

Follow our quickstart guide to add authentication to your Next.js app

View Demo

See Stack Auth in action with our live demo application
Stack Auth’s managed service is completely optional. You can export your user data and self-host for free at any time.

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