Error: [vuex] do not mutate vuex store state outside mutation handlers Vue Origin: On your device OSI layer 7 · Application Last updated 5 Nov 2026

Vuex (strict mode): Error: [vuex] do not mutate vuex store state outside mutation handlers.

Store state was modified directly (in a component or action) while strict mode is on.

Exact message you may see Error: [vuex] do not mutate vuex store state outside mutation handlers.do not mutate vuex store state outside mutation handlers[vuex] Do not mutate vuex store state outside mutation handlersVuex strict mode mutation outside handlers
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Seen on: Vue

Meaning

Change state only inside mutations (commit). Copy state before editing (structuredClone/JSON.parse(JSON.stringify())) for local forms; v-model directly on store state triggers this — use a computed with get/set that commits. Turn off strict in production for performance.

Common causes

  • this.$store.state.user.name = "A"
  • v-model="$store.state.x"
  • Mutating objects from state in a component
  • Action mutating state directly
  • Third-party code modifying store objects

⚡ Quick fix

  1. commit("SET_NAME", value) in mutations
  2. Computed get/set committing for v-model
  3. Clone before local modification

Detailed fix by platform

Vue

  1. computed: { name: { get() { return this.$store.state.user.name }, set(v) { this.$store.commit("SET_NAME", v) } } }

How to diagnose

  1. Change — In mutation?
  2. v-model — Computed?
  3. Clone — Used?

🔧 Still not fixed?

Many errors look alike. If the steps above didn’t solve it, one of these is probably what you’re facing:

Where this error sits

Origin: On your device. Errors that are often confused with or caused by this one (click to open):

[Vue warn]: Set operation on key failed: target is readonly — Vue: [Vue warn]: Set operation on key "name" failed: target is readonly. (Vue)[Vue warn]: Set opera…[vuex] unknown mutation type / unknown action type — Vuex: [vuex] unknown mutation type: SET_USER / [vuex] unknown action type: fetchUser (Vue)[vuex] unknown mutati…Avoid mutating a prop directly — Vue: [Vue warn]: Avoid mutating a prop directly since the value will be overwritten whenever the parent component re-renders (Vue)Avoid mutating a prop…Failed to resolve component — Vue: [Vue warn]: Failed to resolve component: x (Vue)Failed to resolve com…Nuxt 404: Page not found (route/file naming) — Nuxt: 404 Page not found: /blog/my-post / [Vue Router warn]: No match found for location with path (Vue)Nuxt 404: Page not fo…Nuxt: Failed to fetch dynamically imported module (after deploy) — Nuxt: [nuxt] error caught during app initialization TypeError: Failed to fetch dynamically imported module / Loading chunk failed (Vue)Nuxt: Failed to fetch…Nuxt/Vite: Failed to resolve import "~/..." or "@/..." — Nuxt: [vite] Internal server error: Failed to resolve import "~/components/Foo.vue" from "pages/index.vue". Does the file exist? (Vue)Nuxt/Vite: Failed to …Error: [v…

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