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app.ts
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import express from "express";
import { randomUUID } from "crypto";
import fs from "fs";
const app = express();
app.use(express.json());
type Product = {
id: any;
name: string;
price: number;
};
let products: Product[] = [];
readingFile();
// post method
app.post("/products", (request, response) => {
const { name, price } = request.body;
const id = randomUUID();
const product = {
id,
name,
price,
};
products.push(product);
productFile();
return response.json(product);
});
// get method
app.get("/products", (request, response) => {
return response.json(products);
});
// get method with parameters (id)
app.get("/products/:id", (request, response) => {
const { id } = request.params;
const product = products.find((product) => product.id === id);
console.log(product);
return response.json(product);
});
// put method
app.put("/products/:id", (request, response) => {
const { id } = request.params;
const { name, price } = request.body;
const productIndex = products.findIndex((products) => products.id === id);
products[productIndex] = {
...products[productIndex],
name,
price,
};
productFile();
return response.json({ message: "Product alteration sucessfully" });
});
// delete method with parameters (id)
app.delete("/products/:id", (request, response) => {
const { id } = request.params;
const productIndex = products.findIndex((products) => products.id === id);
products.splice(productIndex, 1);
productFile();
return response.json({ message: "Product deletion sucessfully" });
});
app.listen(4002, () => {
console.log("Server starting in 4002 port");
});
// utility functions
function productFile() {
fs.writeFile("products.json", JSON.stringify(products), (err) => {
if (err) {
console.log(err);
} else {
console.log("Product inserted successfully");
}
});
}
function readingFile() {
fs.readFile("products.json", "utf-8", (err, data) => {
if (err) {
console.log(err);
} else {
products = JSON.parse(data);
}
});
}