Introduction

Auther is a drop-in authentication layer for your app. One frontend package handles the UI and token lifecycle. One backend package protects your routes.

Everything runs through your Auther project. Users created via your frontend are scoped to that project and verified by the backend SDK using your API credentials.

Fast setup

Live in under 5 minutes

Secure by default

HTTP-only cookies, no localStorage

Auto token rotation

Proactive refresh, zero config

Frontend SDK

Drop-in auth modal for any website. Handles login, signup, OAuth, and token rotation automatically.

React SDK

AutherProvider and useAuther hook for React & Next.js. Proactive token refresh and session management built in.

Backend SDK

One-line Express middleware that verifies end-user tokens against the Auther backend in real time.

Before you begin

You need an Auther account and a project. Your Client ID and Client Secret are found in API Keys.