@tanstack/vue-query@5.103.2

Async data hooks for Vue. Version 5.103.2, prepared source at input/source. Peer deps: vue ^2.6.0 || ^3.3.0; Vue 2 needs @vue/composition-api (optional peer) (package.json:56-59). Re-exports everything from @tanstack/query-core 5.103.2, so keepPreviousData, skipToken, focusManager, onlineManager, hydration utils, and observer classes import from @tanstack/vue-query directly (src/index.ts:1).

Setup

Install the plugin once per app. It creates (or accepts) a QueryClient, provides it app-wide, and mounts/unmounts it (src/vueQueryPlugin.ts:74-154):

import { createApp } from 'vue'
import { QueryClient, VueQueryPlugin } from '@tanstack/vue-query'

const app = createApp(App)

// Option A: pass your own client (required for SSR — one fresh client per request)
const queryClient = new QueryClient()
app.use(VueQueryPlugin, { queryClient })

// Option B: let the plugin build one with your defaults
app.use(VueQueryPlugin, {
  queryClientConfig: { defaultOptions: { queries: { staleTime: 5 * 1000 } } },
})

VueQueryPluginOptions: queryClient or queryClientConfig (one or the other), queryClientKey (only when installing multiple clients), clientPersister + clientPersisterOnSuccess (persisted cache restore), enableDevtoolsV6Plugin (src/vueQueryPlugin.ts:11-38). The client is not mounted on the server (src/vueQueryPlugin.ts:87-89).

useQueryClient(id?) throws outside an injection context or without the plugin (src/useQueryClient.ts:27-44).

Basic query

<script setup lang="ts">
import { ref } from 'vue'
import { useQuery } from '@tanstack/vue-query'

const postId = ref(1)
const { status, data, error, refetch } = useQuery({
  queryKey: ['post', postId],          // ref inside the key: tracked, no .value
  queryFn: () => fetchPost(postId.value),
})
</script>

<template>
  <span v-if="status === 'pending'">Loading...</span>
  <span v-else-if="status === 'error'">Error: {{ error!.message }}</span>
  <h1 v-else>{{ data!.title }}</h1>
</template>

Basic mutation

<script setup lang="ts">
import { useMutation, useQueryClient } from '@tanstack/vue-query'

const queryClient = useQueryClient()
const addMutation = useMutation({
  mutationFn: addTodo,
  onSuccess: () => queryClient.invalidateQueries({ queryKey: ['todos'] }),
})

function onAdd() {
  addMutation.mutate('Item', {
    onError: (error) => console.error('Failed:', error),
  })
}
</script>

<template>
  <button @click="onAdd">Add</button>
</template>

mutate swallows rejection by design; per-call callbacks fire only for the latest call. Use mutateAsync for a promise per call (src/useMutation.ts:262-270).

Rules that catch Vue developers

• Returns are Refs. Every result field of useQuery/useInfiniteQuery/useMutation is a Ref (data.value in script, auto-unwrapped in template), except the functions refetch, fetchNextPage, fetchPreviousPage, mutate, mutateAsync, reset, plus suspense() (src/useBaseQuery.ts:27-40, src/useMutation.ts:53-68).
• useQueries returns one Ref of the whole result array (or the combine value), not a reactive array (src/useQueries.ts:357-376).
• Never unwrap refs for the query key. Put the ref itself into queryKey and read .value inside queryFn (src/utils.ts:84-111).
• Only queryKey and enabled accept reactive getters. A function anywhere else is the real callback (queryFn, select, ...). To make any option reactive, pass a whole-options getter useQuery(() => ({ ... })) (src/queryOptions.ts:67-76, src/useQuery.ts:225-227).
• initialData is not reactive; it is read once (src/queryOptions.ts:136-148).
• Call composables in setup() or an effectScope. Outside a scope, dev mode warns about memory leaks (src/useBaseQuery.ts:82-88).
• Imperative fetches go through queryClient.query() / queryClient.infiniteQuery(). fetchQuery, prefetchQuery, fetchInfiniteQuery, prefetchInfiniteQuery, ensureQueryData are deprecated and slated for removal (src/queryClient.ts:251-253, src/queryClient.ts:311-313).
• Declare shared queries with queryOptions() so the key carries its data type for getQueryData, invalidateQueries, and prefetch reuse (src/queryOptions.ts:244-251).

Environment limits

• Prepared source: @tanstack/vue-query 5.103.2 with @tanstack/query-core 5.103.2 (package.json:2,45). Docs match v5; v4 APIs may appear in old examples.
• Vue 3.3+ for Vue 3; Vue 2.6+ with @vue/composition-api, or Vue 2.7 native (package.json:52-59).
• ESM-first dual build (build/modern, build/legacy); sideEffects: false (package.json:21-35).

References

• references/api.md — every export, its signature, and where it lives in the source.
• references/reactivity.md — refs, getters, skipToken, queryOptions getters, shallow.
• references/query-client.md — Vue QueryClient, reactive args, invalidation timing, SSR, multiple clients.
• references/mutations.md — mutations, mutationOptions, useMutationState, optimistic updates.
• references/migration.md — v5 breaking changes and version-specific rules since 5.90.

Official docs: https://tanstack.com/query/latest/docs/framework/vue/overview