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index.js
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index.js
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// imports express
const express = require("express");
// fires up an express server
const server = express();
// enables express to accept json through POST
server.use(express.json());
// query params = ?test=1
// route params = /test/1
// body params = { "name": "Joseph" }
// CRUD - Create, Read, Update, Delete
const users = ["Paulo", "Joseph", "Maria"];
// middleware example; intercepts a request and do something
server.use((req, res, next) => {
// displaying method and url for this request
console.log(`Method: ${req.method}; URL: ${req.url}`);
// next ensures this middleware won't interrupt the request flow
return next();
});
// local middleware example
function checkUserExists(req, res, next) {
// if name parameter isn't found on request body, throw bad request error
// with custom message
if (!req.body.name) {
return res.status(400).json({ error: "User name is required" });
}
// otherwise, proceed with request flow
return next();
}
function checkUserInArray(req, res, next) {
const user = users[req.params.index];
if (!user) {
return res.status(400).json({ error: "User does not exist" });
}
// if passed validation, add another var to the request containing user
// this var can be used by subsequent middlewares or routes
req.user = user;
return next();
}
// lists all users
server.get("/users", (req, res) => {
return res.json(users);
});
// lists a single user
server.get("/users/:index", checkUserInArray, (req, res) => {
// return user directly from request, added in checkUserInArray middleware
return res.json(req.user);
});
// creates a single user
server.post("/users", checkUserExists, (req, res) => {
const { name } = req.body;
users.push(name);
return res.json(users);
});
// updates a single user
server.put("/users/:index", checkUserInArray, checkUserExists, (req, res) => {
const { index } = req.params;
const { name } = req.body;
users[index] = name;
return res.json(users);
});
// deletes a single user
server.delete("/users/:index", checkUserInArray, (req, res) => {
const { index } = req.params;
users.splice(index, 1);
return res.send();
});
// listens to requests on port 3000
server.listen(3000);