Best for
Founders who need success/error/warning feedback toasts wired to form submissions or API calls in a Next.js app
Stack
A ready-made Toast Notification UI you can fork, run, and customize with the prompt pack below.
What's actually inside
The honest engineer's breakdown — what the Toast Notificationtemplate does, how it's wired, and where it's opinionated.
The Toast Notification template is built entirely on Sonner — the library that officially replaced the deprecated shadcn/ui Toast component in shadcn v4. The key architectural piece is the global <Toaster /> component, which must live in the root layout (app/layout.tsx) to render toasts as a portal above all page content. The template puts Toaster in the right place from the start, which is the #1 thing developers get wrong when adding toasts to V0 apps.
The demo page shows five ToastTrigger buttons — Success, Error, Warning, Info, and Promise — each calling the corresponding Sonner API (toast(), toast.error(), toast.warning(), toast.promise()). A CustomToastDemo shows the full rich variant with a title, description, and an Undo action button that receives a callback. The PositionSelector and DurationSlider are interactive controls for exploring all six Sonner position options and duration settings; these are demo-only and should be removed before shipping.
Honest caveat: this template is a demo showcasing Sonner's API — it is not a complete app. When you fork it, your main task is to move the Toaster to your root layout and delete the demo UI, keeping only the toast() calls you want to reuse. The template also has no persistence — toasts fired before a page redirect are lost unless you implement the localStorage queue pattern in the advanced prompt below.
Key UI components
ToasterGlobal <Toaster /> from Sonner mounted in the root layout — renders all active toasts as a portal
ToastTrigger buttonsExample buttons (Success, Error, Warning, Info, Promise) calling the full Sonner API
PositionSelectorDemo UI control showing all 6 Sonner position options (top-right, top-left, bottom-right, etc.)
DurationSliderDemo control adjusting the duration prop on the Toaster component (1–10 seconds)
CustomToastDemoRich toast variant with title, description, and an action button (Undo link) demonstrating the action prop
ThemeToggleToggles the Toaster between light and dark theme prop values
Libraries it leans on
SonnerToast engine — replaces the deprecated shadcn/ui Toast; handles all positioning, animation, and dismissal
shadcn/uiButton, Slider, and Select components used for the demo controls (PositionSelector, DurationSlider)
Tailwind CSSLayout and typography for the demo page
Fork it and get it running
Forking takes five minutes. The main integration task is moving the Toaster to your root layout and wiring toast() calls to your existing form actions.
Open the community page and fork
Go to https://v0.dev/chat/community/fLjYRXrijvp in your browser. Click Fork in the top-right corner. V0 copies the project into your account and opens the full editor with the Vercel Sandbox preview on the right.
Tip: You need a free v0.dev account to fork. Forking does not consume credits.
You should see: V0 editor opens showing the Toast demo page with trigger buttons and the preview pane on the right.
Test all toast variants in the preview
In the Vercel Sandbox preview, click each button: Success, Error, Warning, Info, and Promise. Observe the toast positions and animation. Click the CustomToastDemo button to see the rich variant with an Undo action. Use the PositionSelector to try all six positions and the DurationSlider to test auto-dismiss timing. This confirms Sonner is working correctly before you integrate it.
You should see: All five toast types fire and auto-dismiss. The Undo button in the custom toast triggers its callback. Position and duration controls update the Toaster in real time.
Move the Toaster to your root layout
Open the Code tab and find the <Toaster /> component. If it's inside the demo page file, move it to app/layout.tsx — place it as a direct child of the <body> tag, outside any page-specific wrappers. This ensures the Toaster persists across all route changes and toasts don't disappear on navigation. This is a free code edit, no credits needed.
Tip: If you're copying this into an existing project, just add import { Toaster } from 'sonner' and <Toaster /> to your existing root layout — you don't need to copy the whole demo page.
You should see: The Toaster is in app/layout.tsx. Toasts triggered from any page in the app now render correctly.
Delete the demo UI and keep only the essentials
Remove the PositionSelector, DurationSlider, and ThemeToggle demo controls from the page — these are for exploring the API, not for production use. Keep the <Toaster /> in the root layout and any toast() call helpers you want to reference. This step turns the demo into a clean integration piece.
You should see: The page is clean — no demo controls remain. The Toaster is the only Sonner artifact, ready to be triggered from real app events.
Publish to production
Click Share in the top-right, open the Publish tab, and click 'Publish to Production'. V0 deploys in 30–60 seconds. Then connect GitHub via the Git panel to export the cleaned-up layout to your repository via a pull request.
You should see: A live Vercel URL confirms the Toaster is in the root layout and toasts fire correctly on the deployed site.
The prompt pack
Copy-paste these straight into v0's chat to customize the Toast Notificationtemplate. Each one names this template's own components — no generic filler.
Wire toast to a contact form submit
Wires Sonner success and error toasts to a form Server Action, and removes the demo UI leaving a clean form.
In the contact form component, call toast.success('Message sent!') after a successful Server Action response, and toast.error('Something went wrong. Try again.') if the Server Action throws or returns an error object. The Toaster should be in the bottom-right position. Remove all demo buttons (PositionSelector, DurationSlider, ThemeToggle) from the page — only keep the <Toaster /> in the root layout and the form with its submit handler.Customize toast colors to match brand
Overrides Sonner's default toast colors with brand-specific Tailwind classes for success and error states.
Update the Toaster component's toastOptions prop to customize toast colors using Sonner's classNames API. Success toasts should use: classNames={{ toast: 'bg-violet-50 border-violet-200 dark:bg-violet-900', title: 'text-violet-900 dark:text-violet-100' }}. Error toasts should use a red-50/red-200 light palette and dark:bg-red-900 for dark mode. Keep the default Sonner slide-in animation from the bottom-right — only override colors.Add a promise toast for an async API save
Uses toast.promise() to show a three-state loading/success/error toast wrapping an async fetch call to an API route.
Add a toast.promise() call that wraps a fetch to POST /api/save-data. Configure the three loading/success/error states: loading: 'Saving your data…', success: (result) => `Saved: ${result.name}`, error: 'Failed to save — check your connection.' Show the toast in the top-center position by passing position='top-center' to the Toaster in the root layout. Ensure the promise chain catches fetch rejections and passes them to toast.promise's error state so network failures display the error message rather than a generic crash.Add an undo-delete toast for item deletion
Implements a soft-delete + undo pattern using Sonner's action prop — the item is only hard-deleted if the user doesn't click Undo within 5 seconds.
When the user clicks a Delete button, call toast('Item deleted', { action: { label: 'Undo', onClick: () => restoreItem(itemId) }, duration: 5000 }). The restoreItem function should call a Server Action that sets the item's deleted_at column to null in a Supabase items table. If the toast auto-dismisses without Undo being clicked, trigger the hard delete via a second Server Action that permanently removes the row. This pattern gives users a 5-second recovery window before data is lost.Persist toast queue across page redirects
Persists toast messages in localStorage so they survive full-page redirects caused by Server Actions — useful for post-redirect feedback.
Create a toastQueue utility module that stores pending toast messages in localStorage under the key 'pending-toasts' as a JSON array of { type, message, timestamp } objects. On page load, inside a useEffect in the root layout, read the queue and call the appropriate toast() function (toast(), toast.error(), etc.) for any item where timestamp is within the last 60 seconds. After displaying, clear those items from the queue. Call toastQueue.add({ type: 'success', message: 'Changes saved', timestamp: Date.now() }) immediately before triggering a Server Action that causes a page redirect, so the toast appears after the redirect completes.Gotchas when you extend it
The failures people actually hit when they push this template past its defaults — and the exact fix for each.
The component at https://ui.shadcn.com/r/styles/new-york-v4/toast.json was not found. It may not exist at the registry.Why: This is the #1 reported V0 registry error. The old shadcn/ui Toast component was removed from the v4 registry in favor of Sonner. V0 may still generate shadcn toast imports when you ask for 'add a toast notification' in chats that reference older code patterns.
Fix: Always use Sonner directly — import { toast } from 'sonner' and <Toaster /> from 'sonner'. This template already uses Sonner correctly. Do not let V0 rewrite it to use the deprecated shadcn toast.
Remove any shadcn/ui toast imports and replace them with Sonner — import { toast, Toaster } from 'sonner'. Add <Toaster /> to the root layout and replace all toast() calls to use Sonner's API.Toaster not rendering (toasts fire but nothing appears on screen)Why: The <Toaster /> component must be rendered at the root layout level. If placed inside a page component, the Toaster unmounts on navigation and active toasts disappear.
Fix: Move <Toaster /> to app/layout.tsx, inside the <body> tag but outside any page-specific wrappers.
Move the <Toaster /> component from the current page file into app/layout.tsx, placed as a direct child of <body> so it persists across all page navigations.
Build failed: export const metadata conflicts with 'use client' on toast pageWhy: V0 sometimes adds export const metadata = { generator: 'v0.dev' } to the same file that uses the 'use client' directive. Next.js App Router does not allow metadata exports in Client Components.
Fix: Remove the metadata export from any file that has 'use client'. Move metadata exports to a Server Component parent file.
Remove the export const metadata block from all files that have the 'use client' directive — move metadata exports to Server Component parent files.
Toast position wrong on mobile (toasts stack behind mobile keyboard or bottom nav)Why: Sonner's bottom-right position uses fixed positioning. On mobile, when a keyboard is open, fixed elements can overlap the input field or a bottom navigation bar.
Fix: Use position='top-right' or position='top-center' for apps with heavy mobile form usage, or add offset={{ bottom: 80 }} to push toasts above a bottom navigation bar.
Change the Toaster position to top-right and add a top offset of 16px so toasts don't overlap with mobile keyboards or bottom navigation bars.
Template vs. custom — the honest call
A forked template gets you far, fast. Here's where it holds up, and where you'll outgrow it.
The template is enough when
- You need standard success/error/warning feedback on form submissions or async mutations
- Sonner's default animations and six positioning options are sufficient for your use case
- You're building a Next.js app and want the toast system set up in under an hour
- You need toast.promise() for async operations with three-state loading/success/error feedback
Go custom when
- You need toasts with embedded interactive components (progress bars, multi-step actions) beyond Sonner's single action button
- You need toast deduplication logic to prevent notification spam on rapid repeated API calls
- You need server-sent toasts pushed via WebSocket from your backend in real time
If you need the toast system connected to a full error monitoring pipeline or a real-time notification queue, RapidDev can wire this up as part of a broader Next.js infrastructure engagement.
Frequently asked questions
Is the Toast Notification v0 template free to fork?
Yes. All V0 community templates are free to fork with any v0.dev account. Forking does not consume credits. Sonner is MIT-licensed — no restrictions on commercial use.
Can I use Sonner toasts in a commercial product?
Yes. Sonner is MIT-licensed and free for any use, commercial or otherwise. The generated V0 code is yours to own and ship without attribution requirements.
Why did my V0 prompt add a shadcn toast that returns a registry 404 error?
The shadcn/ui Toast component was removed from the shadcn v4 registry and replaced by Sonner. V0 may still generate import { toast } from '@/components/ui/toast' when you use generic language like 'add a toast notification' in a chat with older code context. Always use Sonner directly: import { toast } from 'sonner'. This template already handles this correctly.
Why does my fork fire toasts but nothing appears on screen?
The <Toaster /> component needs to live in app/layout.tsx as a direct child of <body>. If it's inside a page component, it unmounts when you navigate away and active toasts disappear. Move it to the root layout — that's the single most common integration mistake with Sonner in V0 projects.
How do I wire a toast to a Server Action form submission?
After your Server Action returns, check the result in the client component's onSubmit handler. Call toast.success('Message sent!') on success or toast.error('Something went wrong.') on failure. The quick prompt in the pack above gives you the exact implementation — including removing the demo UI.
Why does my build fail with 'export const metadata conflicts with use client'?
V0 sometimes adds an export const metadata = { generator: 'v0.dev' } export to the same file that uses 'use client'. Next.js App Router does not allow metadata exports in Client Components. Remove the metadata export from any file with 'use client' and move it to a Server Component parent.
Can RapidDev integrate this toast system with a real-time notification backend?
Yes. If you need toasts driven by WebSocket events, a notification queue, or a full error monitoring pipeline (like Sentry webhooks triggering in-app alerts), RapidDev can wire this Sonner setup into that infrastructure as part of a production engagement.
Does this template work with Next.js Server Actions that cause full-page redirects?
Standard toast() calls are lost on a full-page redirect because the component unmounts. Use the advanced prompt in the pack — it shows a localStorage queue pattern where you write the pending toast before the redirect and replay it after the new page mounts. This gives you post-redirect feedback without a WebSocket.
Outgrowing the template?
RapidDev turns v0 prototypes into production apps — real auth, database, and payments — at $13K–$25K.
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