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title: devtools description: How to time-travel debug your store nav: 205

devtools

devtools middleware lets you use Redux DevTools Extension without Redux. Read more about the benefits of using Redux DevTools for debugging.

[!IMPORTANT] In order to use devtools from zustand/middleware you need to install @redux-devtools/extension library.

const nextStateCreatorFn = devtools(stateCreatorFn, devtoolsOptions)

• Types
  • Signature
  • Mutator
• Reference
• Usage
  • Debugging a store
  • Debugging a Slices pattern based store
  • Filtering actions with actionsDenylist
  • Cleanup
• Troubleshooting
  • Only one store is displayed
  • Action names are labeled as 'anonymous'

Types

Signature

devtools<T>(stateCreatorFn: StateCreator<T, [], []>, devtoolsOptions?: DevtoolsOptions): StateCreator<T, [['zustand/devtools', never]], []>

Mutator

<!-- prettier-ignore-start -->

['zustand/devtools', never]

<!-- prettier-ignore-end -->

Reference

devtools(stateCreatorFn, devtoolsOptions)

Parameters

• stateCreatorFn: A function that takes set function, get function and store as arguments. Usually, you will return an object with the methods you want to expose.
• optional devtoolsOptions: An object to define Redux Devtools options.
  • optional name: A custom identifier for the connection in the Redux DevTools.
  • optional enabled: Defaults to true when is on development mode, and defaults to false when is on production mode. Enables or disables the Redux DevTools integration for this store.
  • optional anonymousActionType: Defaults to the inferred action type or anonymous if unavailable. A string to use as the action type for anonymous mutations in the Redux DevTools.
  • optional store: A custom identifier for the store in the Redux DevTools.
  • optional actionsDenylist: A string or array of strings (regex patterns) that specify which actions should be filtered out from Redux DevTools. This option is passed directly to Redux DevTools for filtering. For example, ['secret.*'] will filter out all actions starting with "secret".

Returns

devtools returns a state creator function.

Usage

Debugging a store

This example shows you how you can use Redux Devtools to debug a store

import { create, StateCreator } from 'zustand'
import { devtools } from 'zustand/middleware'

type JungleStore = {
  bears: number
  addBear: () => void
  fishes: number
  addFish: () => void
}

const useJungleStore = create<JungleStore>()(
  devtools((set) => ({
    bears: 0,
    addBear: () =>
      set((state) => ({ bears: state.bears + 1 }), undefined, 'jungle/addBear'),
    fishes: 0,
    addFish: () =>
      set(
        (state) => ({ fishes: state.fishes + 1 }),
        undefined,
        'jungle/addFish',
      ),
  })),
)

Debugging a Slices pattern based store

This example shows you how you can use Redux Devtools to debug a Slices pattern based store

import { create, StateCreator } from 'zustand'
import { devtools } from 'zustand/middleware'

type BearSlice = {
  bears: number
  addBear: () => void
}

type FishSlice = {
  fishes: number
  addFish: () => void
}

type JungleStore = BearSlice & FishSlice

const createBearSlice: StateCreator<
  JungleStore,
  [['zustand/devtools', never]],
  [],
  BearSlice
> = (set) => ({
  bears: 0,
  addBear: () =>
    set(
      (state) => ({ bears: state.bears + 1 }),
      undefined,
      'jungle:bear/addBear',
    ),
})

const createFishSlice: StateCreator<
  JungleStore,
  [['zustand/devtools', never]],
  [],
  FishSlice
> = (set) => ({
  fishes: 0,
  addFish: () =>
    set(
      (state) => ({ fishes: state.fishes + 1 }),
      undefined,
      'jungle:fish/addFish',
    ),
})

const useJungleStore = create<JungleStore>()(
  devtools((...args) => ({
    ...createBearSlice(...args),
    ...createFishSlice(...args),
  })),
)

Filtering actions with actionsDenylist

You can filter out specific actions from Redux DevTools using the actionsDenylist option. This is useful for hiding internal or sensitive actions from the DevTools timeline.

import { create } from 'zustand'
import { devtools } from 'zustand/middleware'

type Store = {
  user: string | null
  token: string | null
  login: (user: string, token: string) => void
  logout: () => void
  updateData: () => void
}

const useStore = create<Store>()(
  devtools(
    (set) => ({
      user: null,
      token: null,
      login: (user, token) => set({ user, token }, undefined, 'auth/login'),
      logout: () => set({ user: null, token: null }, undefined, 'auth/logout'),
      updateData: () =>
        set({ user: 'updated' }, undefined, 'internal/updateData'),
    }),
    {
      name: 'AuthStore',
      // Filter out actions matching these regex patterns
      actionsDenylist: ['internal/.*'], // Hides all 'internal/*' actions
    },
  ),
)

You can also use a single regex string:

const useStore = create<Store>()(
  devtools(
    (set) => ({
      // ... state and actions
    }),
    {
      name: 'MyStore',
      actionsDenylist: 'secret.*', // Hides all actions starting with 'secret'
    },
  ),
)

[!NOTE] The actionsDenylist option uses regex pattern matching and is handled directly by Redux DevTools Extension. All actions are still sent to DevTools, but matching actions are filtered from the display.

Cleanup

When a store is no longer needed, you can clean up the Redux DevTools connection by calling the cleanup method on the store:

import { create } from 'zustand'
import { devtools } from 'zustand/middleware'

const useStore = create(
  devtools((set) => ({
    count: 0,
    increment: () => set((state) => ({ count: state.count + 1 })),
  })),
)

// When you're done with the store, clean it up
useStore.devtools.cleanup()

This is particularly useful in applications that wrap store in context or create multiple stores dynamically.

Troubleshooting

Only one store is displayed

By default, Redux Devtools only show one store at a time, so in order to see other stores you need to use store selector and choose a different store.

All action names are labeled as 'anonymous'

If an action type name is not provided, it is defaulted to "anonymous". You can customize this default value by providing a anonymousActionType parameter:

For instance the next example doesn't have action type name:

import { create, StateCreator } from 'zustand'
import { devtools } from 'zustand/middleware'

type BearSlice = {
  bears: number
  addBear: () => void
}

type FishSlice = {
  fishes: number
  addFish: () => void
}

type JungleStore = BearSlice & FishSlice

const createBearSlice: StateCreator<
  JungleStore,
  [['zustand/devtools', never]],
  [],
  BearSlice
> = (set) => ({
  bears: 0,
  addBear: () => set((state) => ({ bears: state.bears + 1 })),
  eatFish: () => set((state) => ({ fishes: state.fishes - 1 })),
})

const createFishSlice: StateCreator<
  JungleStore,
  [['zustand/devtools', never]],
  [],
  FishSlice
> = (set) => ({
  fishes: 0,
  addFish: () => set((state) => ({ fishes: state.fishes + 1 })),
})

const useJungleStore = create<JungleStore>()(
  devtools((...args) => ({
    ...createBearSlice(...args),
    ...createFishSlice(...args),
  })),
)

In order to fix the previous example, we need to provide an action type name as the third parameter. Additionally, to preserve the default behavior of the replacement logic, the second parameter should be set to undefined.

Here's the fixed previous example

import { create, StateCreator } from 'zustand'

type BearSlice = {
  bears: number
  addBear: () => void
}

type FishSlice = {
  fishes: number
  addFish: () => void
}

type JungleStore = BearSlice & FishSlice

const createBearSlice: StateCreator<
  JungleStore,
  [['zustand/devtools', never]],
  [],
  BearSlice
> = (set) => ({
  bears: 0,
  addBear: () =>
    set((state) => ({ bears: state.bears + 1 }), undefined, 'bear/addBear'),
})

const createFishSlice: StateCreator<
  JungleStore,
  [['zustand/devtools', never]],
  [],
  FishSlice
> = (set) => ({
  fishes: 0,
  addFish: () =>
    set((state) => ({ fishes: state.fishes + 1 }), undefined, 'fish/addFish'),
})

const useJungleStore = create<JungleStore>()(
  devtools((...args) => ({
    ...createBearSlice(...args),
    ...createFishSlice(...args),
  })),
)

[!IMPORTANT] Do not set the second parameter to true or false unless you want to override the default replacement logic