NestJS_Basic/catDataMocking/src/app.ts

import * as express from "express";
import * as cors from "cors";

import { CatType, Cat } from "./app.model";

const app: express.Express = express();
const port: number = 8000;

app.use(cors());

// * Logging Middleware
app.use((req, res, next) => {
  console.log(req.rawHeaders[1]);
  next();
});

// * json middleware
app.use(express.json());

// * C
app.post("/cats", (req, res) => {
  try {
    const data = req.body;
    Cat.push(data);
    res.status(200).send({
      success: true,
      data: { data },
    });
  } catch (error) {}
});

// * R
app.get("/cats", (req, res) => {
  try {
    const cats = Cat;
    res.status(200).send({
      success: true,
      data: { cats },
    });
  } catch (error) {
    res.status(400).send({
      success: false,
      error: error.message,
    });
  }
});

app.get("/cats/:id", (req, res) => {
  try {
    const params = req.params;
    const cats = Cat.find((cat) => {
      return cat.id === params.id;
    });
    if (!cats) throw new Error("no matched data");
    res.status(200).send({
      success: true,
      data: { cats },
    });
  } catch (error) {
    res.status(400).send({
      success: false,
      error: error.message,
    });
  }
});

// * 404 middleware
app.use((req, res, next) => {
  console.log(req.rawHeaders[1]);
  console.log("This is 404 middleware");
  res.send({ error: "404 not found error" });
});

app.listen(port, () => {
  console.log(`server is on ${port}`);
});