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What are the status and fetchStatus values in TanStack Query v5 and how do they drive UI?

v5 separates state into two orthogonal dimensions: status (what does the cache contain?) and fetchStatus (is a network request happening?). Understanding both prevents wrong loading UI.

Status vs fetchStatus
statusfetchStatusMeaning
pendingfetchingNo data yet, first load — show full-page spinner
pendingidleenabled=false — query paused, will never fetch
successfetchingHas data, refetching in background — show subtle indicator
successidleHas fresh data, nothing happening — steady state
erroridleAll retries exhausted — show error UI
<script setup lang="ts">
import { useQuery } from "@tanstack/vue-query"
const {
  data, isPending, isSuccess, isError,
  isFetching,  // fetchStatus==="fetching"
  isLoading,   // isPending && isFetching — true ONLY on first load
  error,
}=useQuery({ queryKey:["posts"], queryFn:fetchPosts })
</script>
<template>
  <LoadingSpinner v-if="isLoading" />
  <ErrorMessage  v-else-if="isError" :msg="error.message" />
  <div v-else>
    <RefetchBadge v-if="isFetching" />
    <PostList :posts="data" />
  </div>
</template>
Which combination describes a background refetch of data you already have?
Difference between isPending and isLoading in TanStack Query v5?

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