---
source: https://iinventedlight.com/library/notes/nextjs-loading-ui.md
title: "Loading UI with loading.js and streaming"
license: CC-BY-4.0
license_url: https://creativecommons.org/licenses/by/4.0/
source_license: "MIT (vercel/next.js); prose restates cited source lines in own words"
license_family: nextjs-mit
attribution: "Summary by iinventedlight (AI-assisted). Sources: Next.js docs, loading.js, MIT (vercel/next.js); Next.js docs, Streaming, MIT (vercel/next.js). Copyright (c) 2025 Vercel, Inc. MIT (https://raw.githubusercontent.com/vercel/next.js/canary/license.md)."
author: "iinventedlight (synthesis of cited sources); text drafted with AI assistance"
date: 2026-11-09
status: published
approved_by: "Cole Withington, 2026-11-09 13:04 PT: \"Yes, publish all 33 Next.js drafts\""
checked_on: 2026-11-09
as_of: 2026-11-09
confidence: medium
untested: "No Next.js app was run for this note; only the fetched documentation pages were read."
category: coding-references
topic_area: "code-web: Next.js streaming"
tags: [nextjs, loading, streaming]
client: Librarian
sources:
  - id: S1
    title: "loading.js"
    publisher: Next.js docs
    url: https://nextjs.org/docs/app/api-reference/file-conventions/loading
    accessed: 2026-11-09
    license: "MIT (vercel/next.js)"
  - id: S2
    title: "Streaming"
    publisher: Next.js docs
    url: https://nextjs.org/docs/app/guides/streaming
    accessed: 2026-11-09
    license: "MIT (vercel/next.js)"
---
# Loading UI with loading.js and streaming

**Answer:** `loading.js` creates Loading UI with React Suspense. Streaming lets the browser start rendering HTML while the server continues generating the rest.

## See also

- [nextjs-fetching-data](https://iinventedlight.com/library/notes/nextjs-fetching-data/)
- [nextjs-error-handling](https://iinventedlight.com/library/notes/nextjs-error-handling/)

## Claims

- id: C1
  claim: loading.js creates Loading UI with Suspense.
  source: S1
  evidence: "The special file `loading.js` helps you create meaningful Loading UI with"

- id: C2
  claim: Traditional SSR waits for full HTML.
  source: S2
  evidence: "the server produces the full HTML document before sending anything."

- id: C3
  claim: Streaming paints while the server continues.
  source: S2
  evidence: "The browser starts rendering HTML while the server is still generating the rest."

- id: C4
  claim: App Router streams without extra configuration.
  source: S2
  evidence: "Next.js integrates this into the App Router so streaming works without additional configuration."

## Sources

- [S1] loading.js. Next.js docs. https://nextjs.org/docs/app/api-reference/file-conventions/loading . License: MIT (vercel/next.js). Accessed 2026-11-09.

- [S2] Streaming. Next.js docs. https://nextjs.org/docs/app/guides/streaming . License: MIT (vercel/next.js). Accessed 2026-11-09.


License: this note is CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Summary by iinventedlight (AI-assisted). Copyright (c) 2025 Vercel, Inc. Sources: Next.js docs (vercel/next.js on GitHub / nextjs.org), MIT (https://raw.githubusercontent.com/vercel/next.js/canary/license.md). Text was condensed and changed from the originals.

---

Agents: [/agents.md](/agents.md) | [/.well-known/agent-library.json](/.well-known/agent-library.json).