Hi @tribal egret. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:
#Astro renders react wierd
frail quarryBOT
Can you share a bit more about what “weird” means in your case? In the meantime, here are the most common React-in-Astro issues and quick checks:
-
Install and configure the React integration
- Ensure @astrojs/react is installed and added to astro.config.mjs. Missing the renderer causes “No matching renderer” errors or silent non-rendering. [@astrojs/react; No matching renderer]
- If using multiple JSX frameworks (React, Preact, Solid), configure include/exclude so Astro knows which files belong to which framework. [Options; Mixing frameworks]
-
Component renders but isn’t interactive
- Add a client directive (e.g., client:load, client:idle, client:visible). By default, framework components render to static HTML only. [Using framework components; Common gotchas]
- For SPA-like apps (e.g., CRA) use client:load or client:only="react". [Migrating from CRA; client:only]
-
Children passed from Astro to React look wrong
- By default, children are passed as plain strings. If your React component expects real React nodes (e.g., multiple children elements), enable experimentalReactChildren in the React integration. [Options]
-
Hydration or SSR differences
- React components render server-side by default and then hydrate, so console.log may appear in the terminal (SSR) and/or the browser (client). Use logs to compare SSR vs hydrated output. [Troubleshooting]
- If a component must only render on the client (e.g., browser-only APIs), use client:only="react" and optionally provide a fallback slot while loading. [client:only]
-
Streaming-related glitches
- Some libraries don’t play well with React streaming SSR. You can disable streaming for React via experimentalDisableStreaming. [Options]
-
General checks when “it doesn’t render”
- Verify the import path, file extension (.jsx/.tsx for React), and component name in your .astro file. [Common gotchas]
- If you see “Cannot find package 'react'”, install react and react-dom alongside the integration. [Troubleshooting; @astrojs/react]
If you can share a small snippet (your .astro file import and usage, the React component, and any console/terminal output), I can pinpoint the exact cause and suggest the minimal fix.
Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:
tribal egret
@frail quarry wierd that for each browser that code is different, on incognico works very ok, but on normal does not
frail quarryBOT
Let me check the knowledge base for you again. One moment! :books:
Thanks for the detail! When something works in private/incognito but not in a normal window, the most common culprits are caching, cookies, and prefetch behavior. Here’s how these interact with Astro and React, and what to try:
-
Cookies affecting server/on-demand rendering
- On-demand rendered pages and API routes can read/set cookies. A stale or unexpected cookie in a normal session can change what gets rendered, while incognito starts “clean.” Try clearing site cookies or testing with cookies disabled to see if behavior aligns. [On-demand features]
-
Browser caching and prefetch differences
- Astro’s prefetch falls back to fetch() in some browsers and relies on cache headers (Cache-Control/ETag). In normal sessions you may have cached responses; incognito often has a “fresh” cache which hides cache-related bugs. Ensure your dynamic pages set correct cache headers, or temporarily disable prefetch to isolate. [Prefetch support]
-
Server islands caching and URL length edge case
- Server islands use GET with props encoded in the URL when small (cacheable) but switch to POST when props are large (not cacheable). If your normal session hits a cached GET while incognito triggers a fresh POST (or vice versa), you can see different results. Keep props small so URLs stay GET-cacheable, or adjust your caching expectations. [Server islands caching]
- Streaming SSR quirks with some libraries
- React output is streamed by default. Some CSS-in-JS or libs can behave inconsistently when streamed vs. fully buffered, and cache/prefetch timing can make it look “session-dependent.” You can test by disabling React streaming globally to see if the issue disappears. [Disable streaming]
Quick steps to debug:
- Clear site data in the normal window (cookies + cache) and test again. [On-demand features; Prefetch support]
- Add console logging on server vs. client to spot SSR vs hydration differences (React runs on server by default, then hydrates). [Debugging framework components]
- If you use server islands, reduce props size to keep GET requests and cache consistent. [Server islands caching]
- Temporarily disable React streaming to test for library incompatibility. [Disable streaming]
If you can share:
- A minimal repro (StackBlitz or small repo),
- Whether the page is prerendered or on-demand,
- Any cookie usage, prefetch usage, and cache headers you set,
I can help pinpoint the exact cause. [Minimal reproduction]
Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:
Let me check the knowledge base for you again. One moment! :books:
Thanks for sharing your config. A few items stand out that could explain “works in incognito but not in normal” (often due to cache, cookies, or prefetch behavior) and React “weirdness.” Here are focused checks and fixes tied to Astro docs:
- Prefetch integration config is deprecated/mismatched
- Astro v3.5+ deprecates @astrojs/prefetch in favor of built-in prefetch. Its old options like selector, intentDelay, throttle don’t apply anymore. Mismatched config can create inconsistent background fetches and caching differences between normal vs incognito sessions.
- Action: Remove @astrojs/prefetch and use the built-in prefetch config in astro.config.mjs. Then opt-in per link with data-astro-prefetch or set global defaults. [Migrating prefetch]
Example:
import { defineConfig } from 'astro/config';
export default defineConfig({
prefetch: {
// choose a default strategy if you want
defaultStrategy: 'hover',
// prefetchAll: true, // optional
},
});
And in your links:
<a href="/about" data-astro-prefetch>About</a>
You can also enable/disable globally or change strategy per link. [Prefetch]
- Server output + caching differences
- With output: 'server', you control cache headers on dynamic pages. Browsers differ in how prefetch is cached: Safari falls back to fetch() and requires proper cache headers; Firefox can error without explicit cache headers; Chrome is most forgiving. This can show up only in normal sessions that have a warmer cache and cookies, while incognito is “clean.” [Browser support]
- Action: Ensure your on-demand/server pages set Cache-Control/ETag appropriately, or temporarily disable prefetch to isolate. For static assets, Astro’s node adapter already sets long cache headers for dist/client/_astro assets in standalone mode. [Standalone assets]
- React streaming incompatibility test
- If the “weird” behavior involves hydration mismatches or CSS-in-JS/third‑party libraries, try disabling React streaming to test. [Disable streaming]
Example:
import react from '@astrojs/react';
export default defineConfig({
integrations: [
react({ experimentalDisableStreaming: true })
]
});
- Mixed JSX frameworks or children parsing
- If you use multiple JSX frameworks, make sure include/exclude is set so React files are handled by the React renderer. [Combining frameworks]
- If children passed from Astro to React look wrong, enable experimentalReactChildren. [Children parsing]
- Node adapter runtime notes
- In standalone mode, your built server serves pages and assets and supports env-driven host/port/HTTPS. Ensure any runtime env vars aren’t being inlined at build time unexpectedly; follow the runtime variables guidance if you rely on them. [Standalone]
- CSRF default in Astro v5
- If you’re on Astro v5 with output: 'server', note that security.checkOrigin defaults to true. If your “normal” session navigations or prefetches come from an origin mismatch, it could block. You can explicitly set security.checkOrigin: false to test. [Changed defaults]
Concrete next steps to isolate:
- Remove @astrojs/prefetch and switch to built-in prefetch; start with prefetch: false to confirm the issue is prefetch/caching-related, then re-enable with minimal config. [Migrating prefetch; Enable prefetch]
- Test with react({ experimentalDisableStreaming: true }) to rule out streaming issues. [Disable streaming]
- Clear cookies and cache for your domain in a normal window and retest; compare behavior across Chrome/Firefox/Safari given their prefetch/cache differences. [Browser support]
- If you’re using server islands, keep props small so requests stay GET (cacheable) rather than POST (not cacheable). [Server islands caching]
If you can share:
- Which pages are prerendered vs on-demand,
- Any custom response headers on those routes,
- The specific “weird” React symptom (e.g., hydration mismatch, stale content),
I can suggest an exact config patch.
Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:
tribal egret
@frail quarry create me a better astro config
frail quarryBOT
Let me check the knowledge base for you again. One moment! :books:
Thanks! Based on your current setup and the docs, here’s a cleaner, more reliable Astro config that:
- Replaces the deprecated @astrojs/prefetch integration with Astro’s built-in prefetch.
- Keeps MDX behavior explicit and predictable.
- Uses the Node adapter in standalone mode with sensible defaults.
- Avoids over-caching dynamic pages while still letting Astro hash-built assets be cached long-term.
Notes inline. Citations after relevant lines.
// astro.config.mjs
import { defineConfig } from 'astro/config';
import react from '@astrojs/react';
import mdx from '@astrojs/mdx';
import sitemap from '@astrojs/sitemap';
import partytown from '@astrojs/partytown';
import node from '@astrojs/node';
export default defineConfig({
site: '<https://seekingbonus.com',>
// Server output with Node adapter (standalone server).
// You can run it with: `node ./dist/server/entry.mjs`
// HOST / PORT can be set via env at runtime.
// HTTPS can be enabled via SERVER_KEY_PATH / SERVER_CERT_PATH.
// [[Standalone](<https://docs.astro.build/en/guides/integrations-guide/node/#standalone>)]
output: 'server',
adapter: node({
mode: 'standalone',
// If your host/CDN needs non-streamed HTML, you can test this:
// experimentalDisableStreaming: true,
// [[experimentalDisableStreaming](<https://docs.astro.build/en/guides/integrations-guide/node/#experimentaldisablestreaming>)]
}),integrations: [
// React integration. If children from .astro must be true React nodes,
// you can enable experimentalReactChildren.
// [Children parsing]
react({
// experimentalReactChildren: true,
// experimentalDisableStreaming: true, // test only if a lib breaks with streaming
// [Disable streaming]
}),
// MDX inherits your Markdown config by default; options here override per MDX.
// [[MDX config](<https://docs.astro.build/en/guides/integrations-guide/mdx/#configuration>)]
mdx({
extendMarkdownConfig: true,
// You can add remark/rehype plugins here for MDX-only overrides.
// [[Extend Markdown](<https://docs.astro.build/en/guides/markdown-content/#extending-markdown-config-from-mdx>)]
remarkPlugins: [],
rehypePlugins: [],
}),
// Built-in prefetch: remove deprecated @astrojs/prefetch integration.
// Opt in per-link with data-astro-prefetch (hover default), or enable prefetchAll.
// [[Prefetch](<https://docs.astro.build/en/guides/prefetch/#_top>);
// [Migrating from @astrojs/prefetch](<https://docs.astro.build/en/guides/prefetch/#migrating-from-astrojsprefetch>)]
// Disable entirely if you need to isolate caching/prefetch issues:
// prefetch: false,
// Otherwise, keep minimal and explicit:
// (Global prefetch config is set below in root config, not as an integration.)
sitemap({
// Exclude admin paths from sitemap.
filter: (page) => !page.includes('/admin/'),
}),
// Partytown to offload third-party scripts.
// You can forward globals like dataLayer.push.
// [Partytown config]
partytown({
config: {
forward: ['dataLayer.push'],
},
}),
],
// Enable Astro’s built-in prefetch globally; opt-in per link with data-astro-prefetch.
// You can also set prefetchAll: true to cover all internal links by default.
// [Enable prefetching;
// Prefetch all links]
prefetch: {
defaultStrategy: 'hover',
// prefetchAll: true, // optional: prefetch every internal link by default
},
// Build output: Astro already hashes assets in _astro/ for long-term caching.
// The Node adapter adds Cache-Control for hashed assets it serves in standalone mode.
// [Assets in standalone]
build: {
inlineStylesheets: 'auto',
assets: '_astro',
},
// Keep Rollup output defaults unless you have a specific need to override names.
// Hashed filenames are handled automatically by Astro/Vite.
// Avoid setting global Cache-Control headers for every response at dev/runtime level.
// For dynamic SSR pages, set headers per route as needed.
// For static hashed assets, the adapter already sets long cache headers in standalone mode.
// [Assets headers]
});
How to use built-in prefetch on links:
```html
<!-- Default hover strategy -->
<a href="/about" data-astro-prefetch>About</a><!-- Different strategy, e.g., prefetch on viewport -->
<a href="/pricing" data-astro-prefetch="viewport">Pricing</a>
[[Prefetch strategies](<https://docs.astro.build/en/guides/prefetch/#prefetch-strategies>)]
Why this is “better” for your case:
- Removes deprecated @astrojs/prefetch and uses the first-party, built-in configuration to avoid inconsistent behavior across browsers and sessions. [[Migrating from @astrojs/prefetch](<https://docs.astro.build/en/guides/prefetch/#migrating-from-astrojsprefetch>)]
- Lets the Node standalone server serve hashed assets with strong cache headers automatically, reducing the need for manual global headers (which can accidentally cache dynamic SSR responses). [[Assets](<https://docs.astro.build/en/guides/integrations-guide/node/#assets>)]
- Keeps React options ready for compatibility testing (children parsing, disable streaming) without enabling them unless needed. [[Children parsing](<https://docs.astro.build/en/guides/integrations-guide/react/#children-parsing>); [Disable streaming](<https://docs.astro.build/en/guides/integrations-guide/react/#disable-streaming-experimental>)]
- MDX config is explicit and aligned with how extension/overrides work in v2+. [[MDX configuration](<https://docs.astro.build/en/guides/integrations-guide/mdx/#configuration>); [Extending from MDX](<https://docs.astro.build/en/guides/markdown-content/#extending-markdown-config-from-mdx>)]
If you still see “incognito vs normal” differences after this, try:
- Temporarily set prefetch: false to isolate prefetching and cache effects. [[Browser support](<https://docs.astro.build/en/guides/prefetch/#browser-support>)]
- Test react({ experimentalDisableStreaming: true }) to rule out streaming issues. [[Disable streaming](<https://docs.astro.build/en/guides/integrations-guide/react/#disable-streaming-experimental>)]