VercelVercel
'; user_status_content.firstChild.appendChild(avatarContainer); } else { // Placeholder for LoggedOutUserMenu let loggedOutContainer = document.createElement('div'); // if LoggedOutUserMenu fallback let userBtn = document.createElement('button'); userBtn.style.width = "33px"; userBtn.style.height = "33px"; userBtn.style.display = "flex"; userBtn.style.alignItems = "center"; userBtn.style.justifyContent = "center"; userBtn.style.color = "var(--ds-gray-900)"; userBtn.style.border = "1px solid var(--ds-gray-300)"; userBtn.style.borderRadius = "100%"; userBtn.style.cursor = "pointer"; userBtn.style.background = "transparent"; userBtn.style.padding = "0"; // user icon ( from geist) let svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg'); svg.setAttribute('data-testid', 'geist-icon'); svg.setAttribute('height', '16'); svg.setAttribute('stroke-linejoin', 'round'); svg.setAttribute('style', 'color:currentColor'); svg.setAttribute('viewBox', '0 0 16 16'); svg.setAttribute('width', '16'); let path = document.createElementNS('http://www.w3.org/2000/svg', 'path'); path.setAttribute('fill-rule', 'evenodd'); path.setAttribute('clip-rule', 'evenodd'); path.setAttribute('d', 'M7.75 0C5.95507 0 4.5 1.45507 4.5 3.25V3.75C4.5 5.54493 5.95507 7 7.75 7H8.25C10.0449 7 11.5 5.54493 11.5 3.75V3.25C11.5 1.45507 10.0449 0 8.25 0H7.75ZM6 3.25C6 2.2835 6.7835 1.5 7.75 1.5H8.25C9.2165 1.5 10 2.2835 10 3.25V3.75C10 4.7165 9.2165 5.5 8.25 5.5H7.75C6.7835 5.5 6 4.7165 6 3.75V3.25ZM2.5 14.5V13.1709C3.31958 11.5377 4.99308 10.5 6.82945 10.5H9.17055C11.0069 10.5 12.6804 11.5377 13.5 13.1709V14.5H2.5ZM6.82945 9C4.35483 9 2.10604 10.4388 1.06903 12.6857L1 12.8353V13V15.25V16H1.75H14.25H15V15.25V13V12.8353L14.931 12.6857C13.894 10.4388 11.6452 9 9.17055 9H6.82945Z'); path.setAttribute('fill', 'currentColor'); svg.appendChild(path); userBtn.appendChild(svg); loggedOutContainer.appendChild(userBtn); loggedOutContainer.style.display = 'flex'; loggedOutContainer.style.gap = '8px'; loggedOutContainer.style.alignItems = 'center'; user_status_content.firstChild.appendChild(loggedOutContainer); } })();
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Getting started with Vercel Functions

Last updated December 1, 2025

In this guide, you'll learn how to get started with Vercel Functions using your favorite frontend framework (or no framework).

  • You can use an existing project or create a new one. If you don't have one, you can run the following terminal command to create a Next.js project:
Terminal
pnpm create next-app@latest 

Open the code block in v0 for a walk through on creating a Vercel Function with the below code, or copy the code into your project. The function fetches data from the Vercel API and returns it as a JSON response.

app/api/hello/route.ts
export async function GET(request: Request) {
  const response = await fetch('https://api.vercel.app/products');
  const products = await response.json();
  return Response.json(products);
}

While using fetch is the recommended way to create a Vercel Function, you can still use HTTP methods like GET and POST.

Now that you have set up a Vercel Function, you can explore the following topics to learn more:


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