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← node-api

Expressjs

September 15, 2017

Warum Express?

Node hat http, aber Express macht Routing und Middleware einfacher.

Minimaler Server

code
const express = require("express");
const app = express();

app.get("/todos", (req, res) => {
  res.json([]);
});

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

Middleware

Middleware kann Request/Response bearbeiten:

code
app.use(express.json());

Request/Response

  • req.params fuer URL Parameter
  • req.query fuer Query Strings
  • req.body fuer JSON Body

Beispiel: CRUD

code
const todos = [];

app.post("/todos", (req, res) => {
  const todo = { id: Date.now(), text: req.body.text };
  todos.push(todo);
  res.status(201).json(todo);
});

app.get("/todos/:id", (req, res) => {
  const todo = todos.find((t) => t.id === Number(req.params.id));
  if (!todo) return res.status(404).json({ error: "Not found" });
  res.json(todo);
});

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