The document provides a comprehensive guide on setting up and running an Express.js web application, including prerequisites such as JavaScript and Node.js knowledge, and various template engines. It outlines the steps for installation, configuration, and the use of routing and response handling in Express.js. Additionally, it mentions building a RESTful application and includes resources like Postman for testing APIs.

1. Express JS
Web application framework for node
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2. What We need to start Express js?
• Knowledge
• Javascript basic
• Node js basic
• Using some component support for Express
• Backbone JS ( MVC Client )
• Template Engine Javascript: ejs, jade, mustache
• MongoDb, MySQL
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3. How to setup Express JS?
• npm install (if var dependencies express version )
• npm install [-g] express ( lastest version )
• Express:
• -h, --help : Show help command
• -V, --version : Version of express
• -s, --sessions : Add support session for Express
• -e, --ejs : Use template engine is ejs (default: jade)
• -J, --jshtml : Use template engine is jshtml (default: jade)
• -H, --hogan: Use template engine is jshtml (default: jade)
• -c, --css: (less/stylus) (default: css)
If you want to generate an application with ejs and Stylus support you
would
Express –css stylus --ejs
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4. Run Express JS Application?
• Use: node [project_main_js_file]
Ex: node app.js
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5. Hello Express JS application
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6. API Express JS
• APP
• REQUEST
• RESPONSE
• ROUTER
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7. API Express JS
• Application
var express = require('express');
var app = express();
• App.set(name,value): Assigns setting name to value.
• App.get(name): Get setting name value.
• app.use([path], function): Use the given middleware
function, with optional mount path, defaulting to "/".
• Application Router
• app.VERB(path, [callback...], callback)
• VERB: Http verbs: GET, POST, PUT, DELETE
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8. API Express JS
• REQUEST
• Req.params
• GET: /user/:name , req.params.name  name
• Req.query
• GET: search?q=abc, req.query.q  abc
• Req.param
• // ?name=abc, req.param('name')  abc
• // POST name=abc, req.param('name') //  “abc“
• /user/:name with req: //user/abc req.param('name')
// => “abc"
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9. API Express JS
• RESPONSE
• res.send([body|status], [body])
• res.send({ some: 'json' });
• res.send('some html');
• res.send(404, 'Sorry, we cannot find that!');
• res.send(500, { error: 'something blew up' });
• res.send(200);
• res.render(view, [locals], callback)
• res.render('index', function(err, html){ // ... });
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10. API Express JS
• ROUTER:
• var router = express.Router();
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11. Building Application REST ful with Express Js
• Understand to start application nodejs with Express js
• Create module and require it
• Render view in express
• Router express
Developing more:
• Backbonejs
• MongoDb
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12. Thanks you for watching!
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13. Attachment tools
Postman – REST Client:
https://chrome.google.com/webstore/detail/postman-rest-
client/fdmmgilgnpjigdojojpjoooidkmcomcm
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