Basic Auth Middleware

This middleware can apply Basic authentication to a specified path. Implementing Basic authentication with Cloudflare Workers or other platforms is more complicated than it seems, but with this middleware, it's a breeze.

For more information about how the Basic auth scheme works under the hood, see the MDN docs.

Import

import { Hono } from 'hono'
import { basicAuth } from 'hono/basic-auth'

Usage

const app = new Hono()

app.use(
  '/auth/*',
  basicAuth({
    username: 'hono',
    password: 'acoolproject',
  })
)

app.get('/auth/page', (c) => {
  return c.text('You are authorized')
})

To restrict to a specific route + method:

const app = new Hono()

app.get('/auth/page', (c) => {
  return c.text('Viewing page')
})

app.delete(
  '/auth/page',
  basicAuth({ username: 'hono', password: 'acoolproject' }),
  (c) => {
    return c.text('Page deleted')
  }
)

If you want to verify the user by yourself, specify the verifyUser option; returning true means it is accepted.

const app = new Hono()

app.use(
  basicAuth({
    verifyUser: (username, password, c) => {
      return (
        username === 'dynamic-user' && password === 'hono-password'
      )
    },
  })
)

Options

required username: string

The username of the user who is authenticating.

required password: string

The password value for the provided username to authenticate against.

optional realm: string

The domain name of the realm, as part of the returned WWW-Authenticate challenge header. The default is "Secure Area".
See more: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/WWW-Authenticate#directives

optional hashFunction: Function

A function to handle hashing for safe comparison of passwords.

optional verifyUser: (username: string, password: string, c: Context) => boolean | Promise<boolean>

The function to verify the user.

optional invalidUserMessage: string | object | MessageFunction

MessageFunction is (c: Context) => string | object | Promise<string | object>. The custom message if the user is invalid.

More Options

optional ...users: { username: string, password: string }[]

Recipes

Defining Multiple Users

This middleware also allows you to pass arbitrary parameters containing objects defining more username and password pairs.

app.use(
  '/auth/*',
  basicAuth(
    {
      username: 'hono',
      password: 'acoolproject',
      // Define other params in the first object
      realm: 'www.example.com',
    },
    {
      username: 'hono-admin',
      password: 'super-secure',
      // Cannot redefine other params here
    },
    {
      username: 'hono-user-1',
      password: 'a-secret',
      // Or here
    }
  )
)

Or less hardcoded:

import { users } from '../config/users'

app.use(
  '/auth/*',
  basicAuth(
    {
      realm: 'www.example.com',
      ...users[0],
    },
    ...users.slice(1)
  )
)