snapshot of https://github.com/TanStack/query.git (main, 2026-09-16; blobs > 131072B omitted)

examples/react/nextjs-app-optimistic-updates/app/api/todos/route.ts

@@ -0,0 +1,46 @@
+import { NextResponse } from 'next/server'
+import { todos, getTodos, type Todo } from './data'
+
+export async function GET() {
+  return NextResponse.json(await getTodos())
+}
+
+export async function POST(request: Request) {
+  let body: unknown
+  try {
+    body = await request.json()
+  } catch {
+    return NextResponse.json({ error: 'text is required' }, { status: 400 })
+  }
+
+  const text =
+    body !== null &&
+    typeof body === 'object' &&
+    'text' in body &&
+    typeof (body as { text: unknown }).text === 'string'
+      ? (body as { text: string }).text.trim()
+      : ''
+
+  if (!text) {
+    return NextResponse.json({ error: 'text is required' }, { status: 400 })
+  }
+
+  await new Promise((resolve) => setTimeout(resolve, 500))
+
+  if (Math.random() < 0.3) {
+    return NextResponse.json(
+      { error: 'Server error — please try again' },
+      { status: 500 },
+    )
+  }
+
+  const newTodo: Todo = {
+    id: crypto.randomUUID(),
+    text,
+    createdAt: Date.now(),
+  }
+
+  todos.push(newTodo)
+
+  return NextResponse.json(newTodo, { status: 201 })
+}