[Solved] How do I access useState inside middleware in Nuxt 3? – Nuxt.js

The Solutions:

Solution 1: Initialize, Get, and Update State Values

To use useState inside middleware in Nuxt 3, follow these steps:

1. Initialize the State:

In your composables file, initialize the state using useState() hook. For example:

// composables/states.ts
import { useState } from 'pinia'

export const useAuth = () => {
  const authenticated = useState('authenticated', () => false)
  return { authenticated }
}

2. Get the State Value:

In your middleware file, import the useState() hook and the useAuth() composable. Then, use the useState() hook to get the state value. For example:

// middleware/auth.ts
import { useState } from 'pinia'
import { useAuth } from '../composables/states'

export default defineNuxtRouteMiddleware((to, from) => {
  const { authenticated } = useAuth()
  const isAuthenticated = useState('authenticated')

  if (!isAuthenticated.value) {
    return abortNavigation()
  }
})

3. Update the State Value:

To update the state value, simply assign a new value to the value property of the useState() hook. For example:

// middleware/auth.ts
import { useState } from 'pinia'
import { useAuth } from '../composables/states'

export default defineNuxtRouteMiddleware((to, from) => {
  const { authenticated } = useAuth()

  // Update the state value
  authenticated.value = true

  // Now, the authenticated state value will be changed to `true`
})

Now you can use the useState() hook in your middleware to access and update state values.

Video Explanation:

The following video, titled "Next.js 14 Full Course 2024 | Build and Deploy a Full Stack App ...", provides additional insights and in-depth exploration related to the topics discussed in this post.

Ultimate Next 14 Course: https://www.jsmastery.pro/next14 Next.js recently became the official React framework as outlined in React docs.