devtools.md

id	title
devtools	Devtools

Wave your hands in the air and shout hooray because React Query comes with dedicated devtools! 🥳

When you begin your React Query journey, you'll want these devtools by your side. They help visualize all of the inner workings of React Query and will likely save you hours of debugging if you find yourself in a pinch!

Please note that for now, the devtools do not support React Native. If you would like to help us make the devtools platform agnostic, please let us know!

Also note that you can use these devtools to observe queries, but not mutations

Install and Import the Devtools

The devtools are a separate package that you need to install:

$ npm i @tanstack/react-query-devtools
# or
$ pnpm add @tanstack/react-query-devtools
# or
$ yarn add @tanstack/react-query-devtools

For Next 13+ App Dir you must install it as a dev dependency for it to work.

You can import the devtools like this:

import { ReactQueryDevtools } from '@tanstack/react-query-devtools'

By default, React Query Devtools are only included in bundles when process.env.NODE_ENV === 'development', so you don't need to worry about excluding them during a production build.

Floating Mode

Floating Mode will mount the devtools as a fixed, floating element in your app and provide a toggle in the corner of the screen to show and hide the devtools. This toggle state will be stored and remembered in localStorage across reloads.

Place the following code as high in your React app as you can. The closer it is to the root of the page, the better it will work!

import { ReactQueryDevtools } from '@tanstack/react-query-devtools'

function App() {
  return (
    <QueryClientProvider client={queryClient}>
      {/* The rest of your application */}
      <ReactQueryDevtools initialIsOpen={false} />
    </QueryClientProvider>
  )
}

Options

• initialIsOpen: Boolean
  • Set this true if you want the dev tools to default to being open
• buttonPosition?: "top-left" | "top-right" | "bottom-left" | "bottom-right"
  • Defaults to bottom-left
  • The position of the React Query logo to open and close the devtools panel
• position?: "top" | "bottom" | "left" | "right"
  • Defaults to bottom
  • The position of the React Query devtools panel
• client?: QueryClient,
  • Use this to use a custom QueryClient. Otherwise, the one from the nearest context will be used.
• errorTypes?: { name: string; initializer: (query: Query) => TError}
  • Use this to predefine some errors that can be triggered on your queries. Initializer will be called (with the specific query) when that error is toggled on from the UI. It must return an Error.
• styleNonce?: string
  • Use this to pass a nonce to the style tag that is added to the document head. This is useful if you are using a Content Security Policy (CSP) nonce to allow inline styles.

Devtools in production

Devtools are excluded in production builds. However, it might be desirable to lazy load the devtools in production:

import * as React from 'react'
import { QueryClient, QueryClientProvider } from '@tanstack/react-query'
import { ReactQueryDevtools } from '@tanstack/react-query-devtools'
import { Example } from './Example'

const queryClient = new QueryClient()

const ReactQueryDevtoolsProduction = React.lazy(() =>
  import('@tanstack/react-query-devtools/build/modern/production.js').then(
    (d) => ({
      default: d.ReactQueryDevtools,
    }),
  ),
)

function App() {
  const [showDevtools, setShowDevtools] = React.useState(false)

  React.useEffect(() => {
    // @ts-ignore
    window.toggleDevtools = () => setShowDevtools((old) => !old)
  }, [])

  return (
    <QueryClientProvider client={queryClient}>
      <Example />
      <ReactQueryDevtools initialIsOpen />
      {showDevtools && (
        <React.Suspense fallback={null}>
          <ReactQueryDevtoolsProduction />
        </React.Suspense>
      )}
    </QueryClientProvider>
  )
}

export default App

With this, calling window.toggleDevtools() will download the devtools bundle and show them.

Modern bundlers

If your bundler supports package exports, you can use the following import path:

const ReactQueryDevtoolsProduction = React.lazy(() =>
  import('@tanstack/react-query-devtools/production').then((d) => ({
    default: d.ReactQueryDevtools,
  })),
)

For TypeScript, you would need to set moduleResolution: 'nodenext' in your tsconfig, which requires at least TypeScript v4.7.