Learn Vercel-serverless - 10 Code Examples & CST Typing Practice Test
Vercel Serverless is a cloud-native serverless platform that allows developers to deploy JavaScript, TypeScript, and other web functions globally with zero infrastructure management. It emphasizes fast deployment, automatic scaling, and edge distribution.
View all 10 Vercel-serverless code examples →
Learn VERCEL-SERVERLESS with Real Code Examples
Updated Nov 25, 2025
Code Sample Descriptions
Simple Vercel Serverless Function (JavaScript)
# vercel/demo/hello.js
export default function handler(req, res) {
res.status(200).send('Hello, Vercel!');
}
A simple Vercel Serverless Function that responds with 'Hello, Vercel!' to HTTP requests.
Vercel Serverless Function with JSON Response
# vercel/demo/json.js
export default function handler(req, res) {
res.status(200).json({ message: 'Hello JSON!' });
}
A function returning JSON data.
Vercel Function with Query Parameters
# vercel/demo/query.js
export default function handler(req, res) {
const name = req.query.name || 'Guest';
res.status(200).send('Hello, ' + name);
}
A function that reads query parameters and responds accordingly.
Vercel Function Handling POST Request
# vercel/demo/post.js
export default function handler(req, res) {
if (req.method === 'POST') {
const data = req.body;
res.status(200).json({ received: data });
} else {
res.status(405).send('Method Not Allowed');
}
}
A function that handles POST requests with JSON payload.
Vercel Function with Environment Variables
# vercel/demo/env.js
export default function handler(req, res) {
const apiKey = process.env.MY_API_KEY;
res.status(200).send('API Key length: ' + apiKey.length);
}
A function using environment variables from Vercel.
Vercel Function Redirect
# vercel/demo/redirect.js
export default function handler(req, res) {
res.writeHead(302, { Location: 'https://example.com' });
res.end();
}
A function that redirects requests to another URL.
Vercel Function with Custom Headers
# vercel/demo/headers.js
export default function handler(req, res) {
res.setHeader('X-Custom-Header', 'VercelFunction');
res.status(200).send('Custom headers added');
}
A function that adds custom headers to the response.
Vercel Function Fetching External API
# vercel/demo/fetch.js
export default async function handler(req, res) {
const response = await fetch('https://api.github.com');
const data = await response.json();
res.status(200).json(data);
}
A function fetching data from an external API and returning it.
Vercel Function Serving HTML
# vercel/demo/html.js
export default function handler(req, res) {
const html = '<!DOCTYPE html><html><body><h1>Hello HTML!</h1></body></html>';
res.setHeader('Content-Type', 'text/html');
res.status(200).send(html);
}
A function that responds with a simple HTML page.
Vercel Function Conditional Response
# vercel/demo/method.js
export default function handler(req, res) {
if (req.method === 'POST') {
res.status(200).send('You sent a POST request');
} else {
res.status(200).send('You sent a GET request');
}
}
A function that responds differently based on the HTTP method.
Frequently Asked Questions about Vercel-serverless
What is Vercel-serverless?
Vercel Serverless is a cloud-native serverless platform that allows developers to deploy JavaScript, TypeScript, and other web functions globally with zero infrastructure management. It emphasizes fast deployment, automatic scaling, and edge distribution.
What are the primary use cases for Vercel-serverless?
Serverless REST and GraphQL APIs. Edge functions for personalization and A/B testing. Dynamic routes in Next.js applications. Webhook handlers for third-party services. On-demand image optimization and processing
What are the strengths of Vercel-serverless?
Fully managed infrastructure - no Kubernetes required. Edge deployment ensures low latency worldwide. Tight integration with Next.js and static sites. Rapid deployment workflow from Git repositories. Built-in observability and logging
What are the limitations of Vercel-serverless?
Vendor lock-in to Vercel platform. Limited runtime and function execution time compared to self-hosted solutions. Less control over low-level infrastructure. Primarily optimized for web applications rather than generic backend workloads. Scaling constraints for high-throughput or long-running tasks
How can I practice Vercel-serverless typing speed?
CodeSpeedTest offers 10+ real Vercel-serverless code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.