Express JS

02-express-tutorial/app.js

@@ -1 +1,16 @@
-console.log('Express Tutorial')
+const express = require("express");
+const app = express();
+
+app.get("/", (req, res) => {
+	const method = req.method;
+
+	res.send("Home");
+});
+
+app.get("/abput", (req, res) => {
+	res.send("About");
+});
+
+app.listen(5000, () => {
+	console.log("server is listening to port");
+});

02-express-tutorial/authorize.js

@@ -0,0 +1,13 @@
+const authorize = (req, res, next) => {
+	const { user } = req.query;
+	if (user === "vini") {
+		// adding a property of user to req object
+		req.user = { name: "vini", id: "4" };
+		next();
+	} else {
+		res.status(401).send("Unauthorised");
+	}
+
+	next();
+};
+module.exports = authorize;

02-express-tutorial/final/01-http-basics.js

@@ -1,26 +1,27 @@
-const http = require('http')
+const http = require("http");
 
 const server = http.createServer((req, res) => {
-  // console.log(req.method)
-  const url = req.url
-  // home page
-  if (url === '/') {
-    res.writeHead(200, { 'content-type': 'text/html' })
-    res.write('<h1>home page</h1>')
-    res.end()
-  }
-  // about page
-  else if (url === '/about') {
-    res.writeHead(200, { 'content-type': 'text/html' })
-    res.write('<h1>about page</h1>')
-    res.end()
-  }
-  // 404
-  else {
-    res.writeHead(404, { 'content-type': 'text/html' })
-    res.write('<h1>page not found</h1>')
-    res.end()
-  }
-})
+	// console.log(req.method)
+	// console.log(req.url)
+	const url = req.url;
+	// home page
+	if (url === "/") {
+		res.writeHead(200, { "content-type": "text/html" });
+		res.write("<h1>home page</h1>");
+		res.end();
+	}
+	// about page
+	else if (url === "/about") {
+		res.writeHead(200, { "content-type": "text/html" });
+		res.write("<h1>about page</h1>");
+		res.end();
+	}
+	// 404
+	else {
+		res.writeHead(404, { "content-type": "text/html" });
+		res.write("<h1>page not found</h1>");
+		res.end();
+	}
+});
 
-server.listen(5000)
+server.listen(5000);

02-express-tutorial/final/04-express-app.js

@@ -1,19 +1,25 @@
-const express = require('express')
-const path = require('path')
+const express = require("express");
 
-const app = express()
+// to get absolute path of the file
+const path = require("path");
+
+const app = express();
 
 // setup static and middleware
-app.use(express.static('./public'))
+/*
+app.use() is used to set up middleware. express.static is a built in middleware.
+static assets are files that server doen't have to change , example  image files,CSS files
+*/
+app.use(express.static("./public"));
 
-app.get('/', (req, res) => {
-  res.sendFile(path.resolve(__dirname, './navbar-app/index.html'))
-})
+app.get("/", (req, res) => {
+	res.sendFile(path.resolve(__dirname, "./navbar-app/index.html"));
+});
 
-app.all('*', (req, res) => {
-  res.status(404).send('resource not found')
-})
+app.all("*", (req, res) => {
+	res.status(404).send("resource not found");
+});
 
 app.listen(5000, () => {
-  console.log('server is listening on port 5000....')
-})
+	console.log("server is listening on port 5000....");
+});

02-express-tutorial/final/06-basic-json.js

@@ -1,10 +1,11 @@
-const express = require('express')
-const app = express()
-const { products } = require('./data')
-app.get('/', (req, res) => {
-  res.json(products)
-})
+const express = require("express");
+// invoke express
+const app = express();
+const { products } = require("./data");
+app.get("/", (req, res) => {
+	res.json(products);
+});
 
 app.listen(5000, () => {
-  console.log('Server is listening on port 5000....')
-})
+	console.log("Server is listening on port 5000....");
+});

02-express-tutorial/final/09-middleware-use.js

@@ -1,24 +1,24 @@
-const express = require('express')
-const app = express()
-const logger = require('./logger')
-const authorize = require('./authorize')
+const express = require("express");
+const app = express();
+const logger = require("./logger");
+const authorize = require("./authorize");
 //  req => middleware => res
-app.use([logger, authorize])
+app.use([logger, authorize]);
 // api/home/about/products
-app.get('/', (req, res) => {
-  res.send('Home')
-})
-app.get('/about', (req, res) => {
-  res.send('About')
-})
-app.get('/api/products', (req, res) => {
-  res.send('Products')
-})
-app.get('/api/items', (req, res) => {
-  console.log(req.user)
-  res.send('Items')
-})
+app.get("/", (req, res) => {
+	res.send("Home");
+});
+app.get("/about", (req, res) => {
+	res.send("About");
+});
+app.get("/api/products", (req, res) => {
+	res.send("Products");
+});
+app.get("/api/items", (req, res) => {
+	console.log(req.user);
+	res.send("Items");
+});
 
 app.listen(5000, () => {
-  console.log('Server is listening on port 5000....')
-})
+	console.log("Server is listening on port 5000....");
+});

02-express-tutorial/final/10-middleware-options.js

@@ -1,28 +1,31 @@
-const express = require('express')
-const app = express()
-const morgan = require('morgan')
-const logger = require('./logger')
-const authorize = require('./authorize')
+const express = require("express");
+const app = express();
+const morgan = require("morgan");
+const logger = require("./logger");
+const authorize = require("./authorize");
 //  req => middleware => res
 
+// 1. use vs route
+// 2. options - our own/express/ third party middle wares
+
 // app.use([logger, authorize])
 // app.use(express.static('./public'))
-app.use(morgan('tiny'))
+app.use(morgan("tiny"));
 
-app.get('/', (req, res) => {
-  res.send('Home')
-})
-app.get('/about', (req, res) => {
-  res.send('About')
-})
-app.get('/api/products', (req, res) => {
-  res.send('Products')
-})
-app.get('/api/items', (req, res) => {
-  console.log(req.user)
-  res.send('Items')
-})
+app.get("/", (req, res) => {
+	res.send("Home");
+});
+app.get("/about", (req, res) => {
+	res.send("About");
+});
+app.get("/api/products", (req, res) => {
+	res.send("Products");
+});
+app.get("/api/items", (req, res) => {
+	console.log(req.user);
+	res.send("Items");
+});
 
 app.listen(5000, () => {
-  console.log('Server is listening on port 5000....')
-})
+	console.log("Server is listening on port 5000....");
+});

02-express-tutorial/final/11-methods.js

@@ -1,80 +1,81 @@
-const express = require('express')
-const app = express()
-let { people } = require('./data')
+const express = require("express");
+const app = express();
+let { people } = require("./data");
 
 // static assets
-app.use(express.static('./methods-public'))
+// express.static is a built in middleware
+app.use(express.static("./methods-public"));
 // parse form data
-app.use(express.urlencoded({ extended: false }))
+app.use(express.urlencoded({ extended: false }));
 // parse json
-app.use(express.json())
+app.use(express.json());
 
-app.get('/api/people', (req, res) => {
-  res.status(200).json({ success: true, data: people })
-})
+app.get("/api/people", (req, res) => {
+	res.status(200).json({ success: true, data: people });
+});
 
-app.post('/api/people', (req, res) => {
-  const { name } = req.body
-  if (!name) {
-    return res
-      .status(400)
-      .json({ success: false, msg: 'please provide name value' })
-  }
-  res.status(201).json({ success: true, person: name })
-})
+app.post("/api/people", (req, res) => {
+	const { name } = req.body;
+	if (!name) {
+		return res
+			.status(400)
+			.json({ success: false, msg: "please provide name value" });
+	}
+	res.status(201).json({ success: true, person: name });
+});
 
-app.post('/api/postman/people', (req, res) => {
-  const { name } = req.body
-  if (!name) {
-    return res
-      .status(400)
-      .json({ success: false, msg: 'please provide name value' })
-  }
-  res.status(201).json({ success: true, data: [...people, name] })
-})
+app.post("/api/postman/people", (req, res) => {
+	const { name } = req.body;
+	if (!name) {
+		return res
+			.status(400)
+			.json({ success: false, msg: "please provide name value" });
+	}
+	res.status(201).json({ success: true, data: [...people, name] });
+});
 
-app.post('/login', (req, res) => {
-  const { name } = req.body
-  if (name) {
-    return res.status(200).send(`Welcome ${name}`)
-  }
+app.post("/login", (req, res) => {
+	const { name } = req.body;
+	if (name) {
+		return res.status(200).send(`Welcome ${name}`);
+	}
 
-  res.status(401).send('Please Provide Credentials')
-})
+	res.status(401).send("Please Provide Credentials");
+});
 
-app.put('/api/people/:id', (req, res) => {
-  const { id } = req.params
-  const { name } = req.body
+app.put("/api/people/:id", (req, res) => {
+	const { id } = req.params;
+	const { name } = req.body;
 
-  const person = people.find((person) => person.id === Number(id))
+	const person = people.find((person) => person.id === Number(id));
 
-  if (!person) {
-    return res
-      .status(404)
-      .json({ success: false, msg: `no person with id ${id}` })
-  }
-  const newPeople = people.map((person) => {
-    if (person.id === Number(id)) {
-      person.name = name
-    }
-    return person
-  })
-  res.status(200).json({ success: true, data: newPeople })
-})
+	if (!person) {
+		return res
+			.status(404)
+			.json({ success: false, msg: `no person with id ${id}` });
+	}
+	const newPeople = people.map((person) => {
+		if (person.id === Number(id)) {
+			person.name = name;
+		}
+		return person;
+	});
+	res.status(200).json({ success: true, data: newPeople });
+});
 
-app.delete('/api/people/:id', (req, res) => {
-  const person = people.find((person) => person.id === Number(req.params.id))
-  if (!person) {
-    return res
-      .status(404)
-      .json({ success: false, msg: `no person with id ${req.params.id}` })
-  }
-  const newPeople = people.filter(
-    (person) => person.id !== Number(req.params.id)
-  )
-  return res.status(200).json({ success: true, data: newPeople })
-})
+app.delete("/api/people/:id", (req, res) => {
+	const person = people.find((person) => person.id === Number(req.params.id));
+	if (!person) {
+		return res
+			.status(404)
+			.json({ success: false, msg: `no person with id ${req.params.id}` });
+	}
+	const newPeople = people.filter(
+		(person) => person.id !== Number(req.params.id),
+	);
+	return res.status(200).json({ success: true, data: newPeople });
+});
 
 app.listen(5000, () => {
-  console.log('Server is listening on port 5000....')
-})
+	console.log("Server is listening on port 5000....");
+});

02-express-tutorial/logger.js

@@ -0,0 +1,9 @@
+const logger = (req, res, next) => {
+	const method = req.method;
+	const url = req.url;
+	const time = new Date().getFullYear();
+	console.log(method, url, time);
+	next();
+};
+
+module.exports = logger;