Serverless trong Thuc te: AWS Lambda vs Vercel Functions vs Cloudflare Workers

Serverless computing cho phep ban chay code ma khong can quan ly server. Ban viet cac ham, trien khai chung va nen tang se xu ly viec mo rong, kha dung va ha tang. Trong nam 2026, ba nen tang thong tri boi canh serverless: AWS Lambda, Vercel Serverless Functions va Cloudflare Workers. Moi nen tang co nhung the manh va danh doi khac nhau.

Trong bai viet nay, chung toi so sanh chung voi cac vi du thuc te, cac can nhac ve hieu suat va phan tich gia.

Serverless hoat dong nhu the nao

Ban trien khai mot ham. Khi mot yeu cau den, nen tang se:

1. Khoi tao moi truong thuc thi (hoac tai su dung mot moi truong da san sang)
2. Chay ham cua ban
3. Tra ve phan hoi
4. Thu nho ve khong khi khong hoat dong (ban khong tra phi cho thoi gian nghi)

Tong quan nen tang

AWS Lambda

Nen tang serverless dau tien (ra mat nam 2014). Chin muoi nhat va giau tinh nang nhat, voi tich hop sau vao he sinh thai AWS.

// AWS Lambda handler
export const handler = async (event) => {
  const body = JSON.parse(event.body);

  const result = await processData(body);

  return {
    statusCode: 200,
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(result),
  };
};

Vercel Serverless Functions

Tich hop chat che voi Next.js va quy trinh trien khai frontend. Cac ham duoc trien khai cung voi frontend cua ban ma khong can cau hinh.

// app/api/hello/route.ts (Next.js App Router)
import { NextResponse } from 'next/server';

export async function GET(request: Request) {
  const { searchParams } = new URL(request.url);
  const name = searchParams.get('name') || 'World';

  return NextResponse.json({ message: `Hello, ${name}!` });
}

Cloudflare Workers

Chay tren mang edge cua Cloudflare tai hon 300 thanh pho tren toan the gioi. Su dung V8 engine (giong nhu Chrome) thay vi Node.js, co nghia la cold start cuc ky nhanh.

// Cloudflare Worker
export default {
  async fetch(request, env) {
    const url = new URL(request.url);
    const name = url.searchParams.get('name') || 'World';

    return new Response(
      JSON.stringify({ message: `Hello, ${name}!` }),
      { headers: { 'Content-Type': 'application/json' } }
    );
  },
};

So sanh tinh nang

Cold Start

Cold start la thoi gian can de khoi tao mot instance ham moi. Day la moi quan tam lon nhat ve hieu suat voi serverless.

Cloudflare Workers thang cold start voi khoang cach lon vi su dung V8 isolate thay vi container.

So sanh gia

Goi mien phi

O quy mo lon (10M yeu cau/thang, thoi luong trung binh 50ms)

Voi hau het cac truong hop su dung, Cloudflare Workers la re nhat. Gia cua Vercel don gian nhung bao gom toan bo nen tang (hosting, CDN, analytics). AWS Lambda co gia chi tiet nhat.

Truong hop su dung thuc te

AWS Lambda: Tot nhat cho

• Quy trinh backend phuc tap - step functions, kien truc huong su kien
• Tich hop voi dich vu AWS - S3 trigger, DynamoDB stream, SQS queue
• Tac vu chay lau - len den 15 phut thoi gian thuc thi
• Nhom da ngon ngu - ho tro pham vi runtime rong nhat

Vercel Functions: Tot nhat cho

• Ung dung Next.js - API route khong can cau hinh
• Nhom tap trung frontend - trien khai frontend va backend cung nhau
• Tao mau nhanh - git push de trien khai
• Kien truc Jamstack - frontend tinh + serverless API

// app/api/subscribe/route.ts
import { NextResponse } from 'next/server';

export async function POST(request: Request) {
  const { email } = await request.json();

  // Validate
  if (!email || !email.includes('@')) {
    return NextResponse.json(
      { error: 'Invalid email' },
      { status: 400 }
    );
  }

  // Save to database
  await db.subscribers.create({ email });

  return NextResponse.json({ success: true });
}

Cloudflare Workers: Tot nhat cho

• API do tre thap - code chay tai hon 300 vi tri tren toan the gioi
• Edge computing - chuyen doi phan hoi, A/B testing, ca nhan hoa
• API luu luong cao - re nhat o quy mo lon voi goi mien phi hao phong
• Ung dung toan cau - du lieu gan nguoi dung voi KV va D1

// Edge-side A/B test
export default {
  async fetch(request, env) {
    const url = new URL(request.url);

    // Assign user to variant
    const cookie = request.headers.get('Cookie') || '';
    let variant = cookie.includes('ab=b') ? 'b' : 'a';

    if (!cookie.includes('ab=')) {
      variant = Math.random() < 0.5 ? 'a' : 'b';
    }

    // Fetch the appropriate version
    const response = await fetch(`${url.origin}/variants/${variant}`);
    const newResponse = new Response(response.body, response);

    // Set cookie for consistent experience
    newResponse.headers.set('Set-Cookie', `ab=${variant}; Path=/; Max-Age=86400`);

    return newResponse;
  },
};

Khi nao chon cai nao

Chon AWS Lambda neu:

• Ban da dau tu vao he sinh thai AWS
• Ban can ham chay lau (len den 15 phut)
• Ban can kien truc huong su kien phuc tap
• Ban can runtime ngoai JavaScript (Python, Go, Rust, Java)

Chon Vercel Functions neu:

• Ban dang xay dung voi Next.js hoac framework frontend
• Ban muon trai nghiem trien khai don gian nhat (git push)
• Nhom cua ban tap trung vao frontend
• Ban muon hosting + ham + CDN trong mot nen tang

Chon Cloudflare Workers neu:

• Ban can do tre thap nhat co the tren toan cau
• Ban muon lua chon re nhat o quy mo lon
• Ban can kha nang edge computing
• Thoi gian cold start rat quan trong cho truong hop su dung cua ban

Co the ket hop chung khong?

Chac chan. Mot kien truc pho bien:

• Cloudflare Workers: dinh tuyen edge, caching, bao mat
• Vercel Functions: API route frontend, SSR
• AWS Lambda: xu ly backend nang, tac vu dinh ky, pipeline su kien

Ket luan

Serverless da truong thanh dang ke. Trong nam 2026, lua chon giua AWS Lambda, Vercel Functions va Cloudflare Workers phu thuoc vao stack va uu tien cua ban:

• Trai nghiem nha phat trien don gian nhat: Vercel
• Manh me va linh hoat nhat: AWS Lambda
• Hieu suat va gia tot nhat: Cloudflare Workers

Ca ba deu san sang cho san xuat va da duoc thu nghiem thuc te. Bat dau voi cai phu hop voi stack hien tai cua ban va mo rong khi nhu cau cua ban tang len.