Supabase + Next.js Notes App

app-directory/supabase-nextjs/.eslintrc.json

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+{
+  "root": true,
+  "extends": "next/core-web-vitals"
+}

app-directory/supabase-nextjs/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# Dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# Testing
+/coverage
+
+# Next.js
+/.next/
+/out/
+next-env.d.ts
+
+# Production
+build
+dist
+
+# Misc
+.DS_Store
+*.pem
+
+# Debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Local ENV files
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+# Vercel
+.vercel
+
+# Turborepo
+.turbo
+
+# typescript
+*.tsbuildinfo

app-directory/supabase-nextjs/README.md

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+# supabase-nextjs example
+
+This example shows how to insert and retrieve data from a Supabase (Postgres) database using Next.js. It uses the App Router and SSR patterns:
+
+- Mutation logic lives in `app/action.ts` using Next.js Server Actions.
+- Query logic lives in `app/queries.ts` and is called from server components.
+- Supabase client configuration is under `lib/supabase/`.
+
+To run this example locally you need a `.env.local` file with your Supabase project keys:
+
+```env
+NEXT_PUBLIC_SUPABASE_URL=your-supabase-url
+NEXT_PUBLIC_SUPABASE_ANON_KEY=your-supabase-anon-key
+```
+
+Add your Supabase API keys there and then start the dev server.
+
+## Running this project locally
+
+1. Install dependencies:
+
+```bash
+pnpm install
+```
+
+2. Create a `.env.local` file in the project root and add your Supabase keys (see above).
+
+3. Start the development server:
+
+```bash
+pnpm dev
+```
+
+4. Open the app in your browser:
+
+```text
+http://localhost:3000
+```
+
+## How to Use
+
+You can choose from one of the following two methods to use this repository:
+
+### One-Click Deploy
+
+Deploy the example using [Vercel](https://vercel.com?utm_source=github&utm_medium=readme&utm_campaign=vercel-examples):
+
+[![Deploy with Vercel](https://vercel.com/button)](https://vercel.com/new/clone?repository-url=https://github.com/vercel/examples/tree/main/app-directory/supabase-nextjs&project-name=supabase-nextjs&repository-name=supabase-nextjs)
+
+### Clone and Deploy
+
+Execute [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app) with [npm](https://docs.npmjs.com/cli/init) or [Yarn](https://yarnpkg.com/lang/en/docs/cli/create/) to bootstrap the example:
+
+```bash
+pnpm create next-app --example https://github.com/vercel/examples/tree/main/app-directory/supabase-nextjs
+```
+
+Next, run Next.js in development mode:
+
+```bash
+pnpm dev
+```
+
+Deploy it to the cloud with [Vercel](https://vercel.com/new?utm_source=github&utm_medium=readme&utm_campaign=edge-middleware-eap) ([Documentation](https://nextjs.org/docs/deployment)).

app-directory/supabase-nextjs/app/action.ts

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+'use server'
+
+import { createSupabaseServer } from '../lib/supabase/server'
+
+export async function createNote(formData: FormData) {
+  try {
+    const username = formData.get('username')
+    const title = formData.get('title')
+    const description = formData.get('description')
+
+    if (
+      typeof username !== 'string' ||
+      typeof title !== 'string' ||
+      typeof description !== 'string'
+    ) {
+      throw new Error('Missing required fields')
+    }
+
+    const supabase = await createSupabaseServer()
+
+    const { error } = await supabase.from('notes').insert({
+      username,
+      title,
+      description,
+    })
+
+    if (error) {
+      throw new Error(error.message)
+    }
+  } catch (err: any) {
+    console.error('Error creating note:', err?.message ?? err)
+    throw err
+  }
+}

app-directory/supabase-nextjs/app/layout.tsx

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+import type { ReactNode } from 'react'
+import { Layout, getMetadata } from '@vercel/examples-ui'
+import '@vercel/examples-ui/globals.css'
+
+export const metadata = getMetadata({
+  title: 'supabase-nextjs',
+  description: 'supabase-nextjs',
+})
+
+export default function RootLayout({ children }: { children: ReactNode }) {
+  return (
+    <html lang="en">
+      <body>
+        <Layout path="app-directory/supabase-nextjs">{children}</Layout>
+      </body>
+    </html>
+  )
+}

app-directory/supabase-nextjs/app/page.tsx

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+import { Page, Text, Code, Link } from '@vercel/examples-ui'
+import { fetchNotes } from './queries'
+import NotesCard from '../components/NotesCard'
+import CreateNotes from '../components/CreateNotes'
+import { createNote } from './action'
+
+export default async function Home() {
+  const notes = await fetchNotes()
+
+  return (
+    <Page className="flex flex-col gap-12">
+      <section className="flex flex-col gap-6">
+        <Text variant="h1">supabase-nextjs usage example</Text>
+        <Text>
+          This project demonstrates how to use Supabase with Next.js App Router
+          to build a simple notes web app. It uses server-side rendering for
+          reading data and Next.js Server Actions for inserting new notes into a
+          Supabase (Postgres) database.
+        </Text>
+      </section>
+
+      <section className="flex flex-col gap-3">
+        <div className="flex items-center justify-between">
+          <Text variant="h2">Notes</Text>
+          <CreateNotes createNote={createNote} />
+        </div>
+        {Array.isArray(notes) &&
+          notes.map((note) => <NotesCard key={note.id} note={note} />)}
+      </section>
+    </Page>
+  )
+}

app-directory/supabase-nextjs/app/queries.ts

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+import { createSupabaseServer } from '../lib/supabase/server'
+
+export async function fetchNotes() {
+  try {
+    const supabase = await createSupabaseServer()
+
+    const { data, error } = await supabase
+      .from('notes')
+      .select('*')
+      .order('created_at', { ascending: false }) // ascending: false, to show latest notes on top
+
+    if (error) throw new Error('Error while finding notes')
+
+    return data
+  } catch (err: any) {
+    console.error('Error fetching notes:', err?.message ?? err)
+    throw err
+  }
+}

app-directory/supabase-nextjs/components/CreateNotes.tsx

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+'use client'
+
+import { useState, useTransition, type FormEvent } from 'react'
+
+type CreateNotesProps = {
+  createNote: (formData: FormData) => Promise<void>
+}
+
+export default function CreateNotes({ createNote }: CreateNotesProps) {
+  const [open, setOpen] = useState(false)
+  const [error, setError] = useState<string | null>(null)
+  const [isPending, startTransition] = useTransition()
+
+  const handleSubmit = (event: FormEvent<HTMLFormElement>) => {
+    event.preventDefault()
+    const form = event.currentTarget
+    const formData = new FormData(form)
+
+    setError(null)
+
+    startTransition(() => {
+      createNote(formData)
+        .then(() => {
+          form.reset()
+          setOpen(false)
+        })
+        .catch((err: any) => {
+          setError(err?.message ?? 'Something went wrong')
+        })
+    })
+  }
+
+  return (
+    <div className="relative">
+      <button
+        type="button"
+        onClick={() => setOpen((prev) => !prev)}
+        className="inline-flex items-center rounded-md border border-zinc-800 bg-zinc-950 px-3 py-1.5 text-xs font-medium text-zinc-50 shadow-sm hover:border-zinc-700 hover:bg-zinc-900"
+      >
+        Create Note
+      </button>
+
+      {open && (
+        <div className="absolute right-0 top-full z-10 mt-3 w-80 sm:w-96 md:w-[28rem] rounded-xl border border-zinc-800 bg-zinc-950/95 p-4 shadow-xl ring-1 ring-white/10">
+          <div className="mb-3 flex items-center justify-between">
+            <h3 className="text-sm font-medium text-zinc-50">New Note</h3>
+            <button
+              type="button"
+              onClick={() => setOpen(false)}
+              className="rounded-md p-1 text-xs text-zinc-400 hover:bg-zinc-900 hover:text-zinc-100"
+            >
+              Close
+            </button>
+          </div>
+          <form onSubmit={handleSubmit} className="flex flex-col gap-3 text-xs">
+            <label className="flex flex-col gap-1">
+              <span className="text-[11px] font-medium text-zinc-300">
+                Username
+              </span>
+              <input
+                name="username"
+                type="text"
+                className="h-8 rounded-md border border-zinc-800 bg-zinc-950 px-2 text-xs text-zinc-100 shadow-inner outline-none focus:border-zinc-500 focus:ring-1 focus:ring-zinc-500"
+              />
+            </label>
+            <label className="flex flex-col gap-1">
+              <span className="text-[11px] font-medium text-zinc-300">
+                Title
+              </span>
+              <input
+                name="title"
+                type="text"
+                className="h-8 rounded-md border border-zinc-800 bg-zinc-950 px-2 text-xs text-zinc-100 shadow-inner outline-none focus:border-zinc-500 focus:ring-1 focus:ring-zinc-500"
+              />
+            </label>
+            <label className="flex flex-col gap-1">
+              <span className="text-[11px] font-medium text-zinc-300">
+                Description
+              </span>
+              <textarea
+                name="description"
+                className="min-h-[80px] rounded-md border border-zinc-800 bg-zinc-950 px-2 py-1 text-xs text-zinc-100 shadow-inner outline-none focus:border-zinc-500 focus:ring-1 focus:ring-zinc-500"
+              />
+            </label>
+            {error && <p className="text-[11px] text-red-400">{error}</p>}
+            <button
+              type="submit"
+              disabled={isPending}
+              className="mt-4 inline-flex items-center justify-center rounded-md bg-zinc-900 px-3 py-1.5 text-xs font-medium text-zinc-50 shadow-sm ring-1 ring-zinc-700 hover:bg-zinc-800 hover:ring-zinc-600 disabled:opacity-60 disabled:hover:bg-zinc-900 disabled:hover:ring-zinc-700"
+            >
+              {isPending ? 'Saving…' : 'Submit'}
+            </button>
+          </form>
+        </div>
+      )}
+    </div>
+  )
+}

app-directory/supabase-nextjs/components/NotesCard.tsx

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+type Note = {
+  id: string
+  username: string
+  title: string
+  description: string
+  created_at: string
+}
+
+type NotesCardProps = {
+  note: Note
+}
+
+export default function NotesCard({ note }: NotesCardProps) {
+  return (
+    <article className="mt-3 w-full max-w-xl rounded-xl border border-zinc-800 bg-zinc-950/80 p-4 shadow-sm ring-1 ring-white/5">
+      <header className="mb-2 flex items-center justify-between gap-3">
+        <h3 className="truncate text-sm font-medium text-zinc-50">
+          {note.title || 'Untitled Note'}
+        </h3>
+        <span className="shrink-0 text-[11px] text-zinc-500">
+          {new Date(note.created_at).toLocaleDateString()}
+        </span>
+      </header>
+      <div className="mb-2 text-[11px] text-zinc-400">
+        <span className="font-medium text-zinc-300">@{note.username}</span>
+      </div>
+      <p className="text-xs leading-relaxed text-zinc-200">
+        {note.description}
+      </p>
+    </article>
+  )
+}

app-directory/supabase-nextjs/lib/supabase/client.ts

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+import { createBrowserClient } from '@supabase/ssr'
+
+export function createSupabaseBrowser() {
+  return createBrowserClient(
+    process.env.NEXT_PUBLIC_SUPABASE_URL!,
+    process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!
+  )
+}

app-directory/supabase-nextjs/lib/supabase/server.ts

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+import 'server-only'
+import { cookies } from 'next/headers'
+import { createServerClient } from '@supabase/ssr'
+
+export async function createSupabaseServer() {
+  const cookieStore = await cookies()
+
+  return createServerClient(
+    process.env.NEXT_PUBLIC_SUPABASE_URL!,
+    process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!,
+    {
+      cookies: {
+        getAll() {
+          return cookieStore.getAll() // ✅ now this exists
+        },
+        setAll(cookiesToSet) {
+          try {
+            cookiesToSet.forEach(({ name, value, options }) => {
+              cookieStore.set(name, value, options)
+            })
+          } catch {
+            // In Server Components this can be read-only; middleware/route handlers handle refresh.
+          }
+        },
+      },
+    }
+  )
+}