Express.js

Express.js

Express là minimal và flexible Node.js web framework.

Basic App

import express from "express";

const app = express();

// Middleware
app.use(express.json());

// Routes
app.get("/", (req, res) => {
  res.json({ message: "Hello World!" });
});

app.get("/users/:id", (req, res) => {
  const { id } = req.params;
  res.json({ id, name: "User " + id });
});

app.post("/users", (req, res) => {
  const user = req.body;
  res.status(201).json(user);
});

app.listen(3000, () => {
  console.log("Server running on port 3000");
});

Routing

import { Router } from "express";

const router = Router();

router.get("/users", async (req, res) => {
  const users = await db.users.findMany();
  res.json(users);
});

router.post("/users", async (req, res) => {
  const user = await db.users.create({ data: req.body });
  res.status(201).json(user);
});

app.use("/api", router);

Error Handling

// Error handling middleware
app.use((err, req, res, next) => {
  console.error(err.stack);
  res.status(500).json({ error: "Something went wrong!" });
});

CORS

import cors from "cors";

app.use(
  cors({
    origin: "http://localhost:5173",
    credentials: true,
  })
);