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You can connect Auth0 to a Hono app with a small middleware setup: install @auth0/auth0-hono, mount auth0(), then protect the routes that need a signed-in user with requiresAuth(). The five-line idea describes the code integration—not a complete deployment. You still need an Auth0 application and the required environment configuration.
Install the Auth0 Hono SDK
Auth0’s official SDK for Hono is @auth0/auth0-hono. Install it in your project with npm:
npm install @auth0/auth0-honoSee the Auth0 SDK repository for its quick start and configuration details.
Add the middleware and protect a route
The compact integration mounts Auth0 middleware on the app, then adds authentication to the routes that require it. This TypeScript example follows the SDK’s documented quick-start shape:
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import { Hono } from 'hono'
import { auth0, requiresAuth } from '@auth0/auth0-hono'
const app = new Hono()
app.use('*', auth0())
app.get('/profile', requiresAuth(), (c) => {
const user = c.var.auth0.user
return c.json({ name: user?.name, sub: user?.sub })
})
export default appauth0() supplies shared authentication functionality, while requiresAuth() guards the specific handler. In this example, the profile endpoint reads the user from Hono’s context and returns the name and Auth0 subject identifier when available. The repository documents that an unauthenticated request to a protected route receives a 401 response.
Configure your Auth0 application and deployment
The short code example depends on configuration values that must match your Auth0 application and the URL where your Hono app runs. The SDK documents these required values:
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AUTH0_DOMAINAUTH0_CLIENT_IDAUTH0_SESSION_ENCRYPTION_KEY— at least 32 characters, according to the SDK repository.APP_BASE_URL
AUTH0_CLIENT_SECRET is optional in general and required for the refresh-token flow. Keep secrets in server-side environment configuration or your deployment platform’s secret manager; never embed them in browser-visible code. Follow the repository’s setup instructions to configure the Auth0 application and environment for your chosen deployment.
Know which routes the SDK provides
By default, the SDK sets up login, callback, and logout routes at /auth/login, /auth/callback, and /auth/logout. It also handles session encryption and cookies, exposes user context, supports backchannel logout, and can refresh tokens. Check the repository documentation for options if your application needs different route paths or behavior.
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Authentication and authorization are separate decisions. requiresAuth() answers whether a request has an authenticated user. Your authorization policy answers whether that user may perform a particular action. The SDK also documents helpers for organization membership, claims, scopes, and permissions. Scope and permission checks must run after requiresAuth(), so the authenticated identity is available when those checks execute.
Check runtime support before deploying
Hono runs across multiple JavaScript environments, but that does not mean every runtime has the same support status in the Auth0 SDK. The SDK README distinguishes its listed tiers:
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| Runtime | SDK support listed by Auth0 |
|---|---|
| Node.js 18+ | Primary, full support |
| Cloudflare Workers | Primary, full support |
| Bun 1.x+ | Secondary, best-effort support |
| Deno 1.x/2.x | Secondary, best-effort support |
| Vercel Edge | Secondary, best-effort support |
These support tiers come from the Auth0 SDK README; Hono’s broader runtime documentation is available at hono.dev/docs. Confirm the SDK’s current guidance for your runtime before choosing a deployment configuration.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Handle request-specific configuration and session invalidation
Multi-tenant apps with varying environment bindings
The SDK documentation says it captures environment configuration from the first request. If different requests can carry different environment bindings, do not rely on environment variables alone: create separate auth0() middleware instances with explicit configuration, as described in the repository.
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Backchannel logout requiring session-ID invalidation
By default, sessions use encrypted cookies and are stateless. The repository says invalidating sessions by session ID during backchannel logout requires a stateful store; it describes a Workers KV store for Cloudflare Workers. This storage decision is relevant when your logout requirements call for that invalidation behavior, not as a universal prerequisite for the basic middleware setup.
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