--- title: Mastering Parallel Data Fetching in Next.js: Combining... description: A tutorial explains how to avoid slow, waterfall-style data loading in Next.js applications by combining React Suspense, Promise.all, and Promise.allSettled.... canonical: https://daily.dev/posts/mastering-parallel-data-fetching-in-next-js-combining-suspense-promise-all-and-promise-allsettled-oqhl1mozl twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Mastering Parallel Data Fetching in Next.js: Combining Suspense, Promise.all, and Promise.allSettled | daily.dev og:description: A tutorial explains how to avoid slow, waterfall-style data loading in Next.js applications by combining React Suspense, Promise.all, and Promise.allSettled.... og:url: https://daily.dev/posts/mastering-parallel-data-fetching-in-next-js-combining-suspense-promise-all-and-promise-allsettled-oqhl1mozl og:image: https://api.daily.dev/og/posts/Oqhl1Mozl.png og:image:alt: Mastering Parallel Data Fetching in Next.js: Combining Suspense, Promise.all, and Promise.allSettled og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Mastering Parallel Data Fetching in Next.js: Combining Suspense, Promise.all, and Promise.allSettled **[Medium](https://daily.dev/sources/medium_js)** · 6 min read · 51 upvotes · 2 comments ## Summary A tutorial explains how to avoid slow, waterfall-style data loading in Next.js applications by combining React Suspense, Promise.all, and Promise.allSettled. It walks through code examples showing how Suspense manages loading UI, Promise.all fetches multiple mandatory datasets in parallel (failing entirely if one fails), and Promise.allSettled tolerates individual failures by resolving with per-promise status. The goal is faster, more fault-tolerant data fetching architecture. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### What is the difference between Promise.all and Promise.allSettled for fetching multiple APIs in parallel? Promise.all fails entirely if any single promise rejects, making it suited for datasets that are all mandatory. Promise.allSettled instead waits for every promise to complete regardless of success or failure, returning a status of 'fulfilled' or 'rejected' for each one, so partial data can still be shown even if one API call fails. _Developers picking a fetch strategy for optional versus required data can compare patterns like these on daily.dev._ ### How do you use React Suspense with the use hook to show a loading fallback while fetching data in parallel in Next.js? Wrap a component in Suspense with a fallback UI, then pass it a promise created from Promise.all combining multiple fetch calls; inside the child component, call the use hook on that promise to read the resolved data once ready. This shows a fallback like 'Loading data...' instead of a blank screen while both requests run simultaneously. _Anyone wiring up Suspense-based data fetching in Next.js can find worked examples like this via daily.dev._ ## Community discussion Top comments from developers on daily.dev. **@jataki** · 3 upvotes > ReactQuery: "Look what they need just to mimic a fraction of our power" **@allinonetools** · 2 upvotes > This is a great approach. Parallel fetching makes a huge difference, and `Promise.allSettled` is especially useful when one failed request shouldn’t break the whole page. ## Similar posts on daily.dev - [React 19 Suspense for Data Fetching: A New Model for Async UI](https://daily.dev/posts/react-19-suspense-for-data-fetching-a-new-model-for-async-ui-d6pis0eoz) · Syncfusion · 5 upvotes · 0 comments - [Is Promise.all still relevant in 2025?](https://daily.dev/posts/is-promise-all-still-relevant-in-2025--pqrcmhpqz) · LogRocket · 8 upvotes · 0 comments - [The Modern React Data Fetching Handbook: Suspense, use\(\), and ErrorBoundary Explained](https://daily.dev/posts/the-modern-react-data-fetching-handbook-suspense-use-and-errorboundary-explained-fmqjqaccs) · freeCodeCamp · 62 upvotes · 1 comments - [Rethinking async loops in JavaScript](https://daily.dev/posts/rethinking-async-loops-in-javascript-zktafkvag) · Matt Smith · 6 upvotes · 1 comments --- Tags: [#javascript](https://daily.dev/tags/javascript), [#react](https://daily.dev/tags/react), [#nextjs](https://daily.dev/tags/nextjs) [View this post on daily.dev](https://daily.dev/posts/mastering-parallel-data-fetching-in-next-js-combining-suspense-promise-all-and-promise-allsettled-oqhl1mozl) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Mastering Parallel Data Fetching in Next.js: Combining Suspense, Promise.all, and Promise.allSettled","url":"https://daily.dev/posts/mastering-parallel-data-fetching-in-next-js-combining-suspense-promise-all-and-promise-allsettled-oqhl1mozl","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/mastering-parallel-data-fetching-in-next-js-combining-suspense-promise-all-and-promise-allsettled-oqhl1mozl"},"datePublished":"2026-08-15T03:36:35.306Z","dateModified":"2026-09-13T20:20:51.186Z","description":"A tutorial explains how to avoid slow, waterfall-style data loading in Next.js applications by combining React Suspense, Promise.all, and Promise.allSettled....","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/e529c9ba249992cd08c71319f3f3089e?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/e529c9ba249992cd08c71319f3f3089e?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Medium","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Medium","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/medium","url":"https://daily.dev/sources/medium_js"},"commentCount":2,"discussionUrl":"https://daily.dev/posts/mastering-parallel-data-fetching-in-next-js-combining-suspense-promise-all-and-promise-allsettled-oqhl1mozl","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":51},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":2}],"keywords":"javascript,react,nextjs","timeRequired":"PT6M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Medium","item":"https://daily.dev/sources/medium_js"},{"@type":"ListItem","position":3,"name":"Mastering Parallel Data Fetching in Next.js: Combining Suspense, Promise.all, and Promise.allSettled"}]} {"@context":"https://schema.org","@type":"WebPage","@id":"https://daily.dev/posts/mastering-parallel-data-fetching-in-next-js-combining-suspense-promise-all-and-promise-allsettled-oqhl1mozl","comment":[{"@type":"Comment","text":"ReactQuery: “Look what they need just to mimic a fraction of our power”","datePublished":"2026-08-15T14:09:16.467Z","url":"https://daily.dev/posts/Oqhl1Mozl#c-xAbJ4sYUA","author":{"@type":"Person","name":"Manu","url":"https://daily.dev/jataki","image":"https://media.daily.dev/image/upload/s--ZkGZoSg9--/f_auto/v1786360868/avatars/avatar_boM1zeIEEMcERdMpasALr?_a=BAMAMicg0"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":3}},{"@type":"Comment","text":"This is a great approach. Parallel fetching makes a huge difference, and Promise.allSettled is especially useful when one failed request shouldn’t break the whole page.","datePublished":"2026-08-16T02:38:26.594Z","url":"https://daily.dev/posts/Oqhl1Mozl#c-n4iClCX9C","author":{"@type":"Person","name":"AllInOneTools","url":"https://daily.dev/allinonetools","image":"https://media.daily.dev/image/upload/s--4ZT8QlF0--/f_auto/v1769790028/avatars/avatar_igzBsWloJeaegzm9bQltZ?_a=BAMAMiiu0"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":2}}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/mastering-parallel-data-fetching-in-next-js-combining-suspense-promise-all-and-promise-allsettled-oqhl1mozl#faq","mainEntity":[{"@type":"Question","name":"What is the difference between Promise.all and Promise.allSettled for fetching multiple APIs in parallel?","acceptedAnswer":{"@type":"Answer","text":"Promise.all fails entirely if any single promise rejects, making it suited for datasets that are all mandatory. Promise.allSettled instead waits for every promise to complete regardless of success or failure, returning a status of 'fulfilled' or 'rejected' for each one, so partial data can still be shown even if one API call fails. Developers picking a fetch strategy for optional versus required data can compare patterns like these on daily.dev."}},{"@type":"Question","name":"How do you use React Suspense with the use hook to show a loading fallback while fetching data in parallel in Next.js?","acceptedAnswer":{"@type":"Answer","text":"Wrap a component in Suspense with a fallback UI, then pass it a promise created from Promise.all combining multiple fetch calls; inside the child component, call the use hook on that promise to read the resolved data once ready. This shows a fallback like 'Loading data...' instead of a blank screen while both requests run simultaneously. Anyone wiring up Suspense-based data fetching in Next.js can find worked examples like this via daily.dev."}}]} ```