Serverless without complicated words: launch your API in 10 minutes

🧩 What is Serverless anyway?

Serverless is a model where you write code as a set of functions, and the provider (Vercel, Cloudflare, AWS, Google) runs them on request. You don't rent a server "permanently", but only pay for the actual function calls — like a taxi instead of a car.

The result: faster start, less infrastructure, easier support.

⚙️ We run our API on Vercel (though, in ~10 minutes)

1. Install the CLI:

   npm i -g vercel

2. Create a project folder:

   mkdir my-api && cd my-api

3. Add the api/hello.js function file:

   export default function handler(req, res) {
     res.status(200).json({ message: "Hello, world!" });
   }

4. Deposit:

   vercel

   The answer will be a URL like:

   https://my-api.vercel.app/api/hello

You can check vercel dev locally.

⏱️ Why does it come out so quickly

There is no manual server setup — the platform will do everything for you.

Scaling "on demand" — no need to keep a powerful instance 24/7.

Payment for actual performance (or free limits for start).

Templates and autoconfig: less documentation — more work.

📌 Ideal cases for Serverless

• Prototypes and MVP.

• Forms on landing pages (processing requests, webhooks).

• Microservices and cron tasks.

• Chatbots, notifications, easy APIs.

⚠️ What to pay attention to

• Time limit (often 10–30 seconds per request).

• Cold start on some platforms.

• Not for heavy calculations and long connections.

• Binding to the provider (configuration and API features).

🧪 Mini-upgrade: route with parameters

Add an endpoint that greets by name: api/hi.js

export default function handler(req, res) {
  const { name = "Guest" } = req.query;
  res.status(200).json({ hello: `Hi ${name}!` });
}

Request: /api/hi?name=Kodik → response {"hello":"Hi, Kodik!"}

Serverless is a great way to quickly release a working API and not waste time on infrastructure.

📚 Do you want to delve into the topic?

In the attachment Code you will find detailed lessons on various topics, step-by-step exercises, error analysis and convenient practice right on your phone or browser.

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