1. What is RESTful Service Client Sever Communicaiton:
URL :Uniform Resource Locator
URI : Uniform Resourse Indicator
RESTful API / REST API , API:
API : Application Programming Interface
Types of API
2. Building RESTful Service with Express app.locals.title = 'My Application';
app.all('*', requireAuthentication, loadUser)
app.all('*', requireAuthentication)
app.all('*', loadUser)
app.all('/api/*', requireAuthentication)
app.delete()
app.enable()
app.enabled()
app.disable()
app.disabled()
app.engine('ejs')
app.get()
app.get()
app.get('/') //set routes
app.listen() - start server listen
app.METHOD - all http methods
app.param()
app.post()
app.path()
var app = express()
var blog = express()
var blogAdmin = express()
app.use('/blog', blog)
blog.use('/admin', blogAdmin)
console.dir(app.path()) // ''
console.dir(blog.path()) // '/blog'
console.dir(blogAdmin.path()) // '/blog/admin'
app.put()
app.render()
app.route()
var app = express()
app.route('/events')
.all(function (req, res, next) {
// runs for all HTTP verbs first
// think of it as route specific middleware!
})
.get(function (req, res, next) {
res.json({})
})
.post(function (req, res, next) {
// maybe add a new event...
})
app.set('view engine', 'ejs')
app.use(express.static(path.join(__dirname, 'public')))
app.use(express.static(path.join(__dirname, 'files')))
app.use(express.static(path.join(__dirname, 'uploads')))
repesents the HTTP request
knwon as req
req.app
req.baseUrl
req.body
req.originalUrl
req.path
req.hostname
req.ip
req.method
req.protocol
req.params
req.query
req.cookies
req.signedCookies
req.secure
req.app
req.
req.accepts()
req.
req.get()
req.is()
represents the HTTP Response
known as res
res.app - reference to the app instance
res.headersSent
res.cookie() - sets cookie name to value
res.clearCookie()
res.end()
res.send() - sends the HTTP Response
res.json() - send JSON Response
res.status()
res.sendFile
res.sendStatus() -
res.render() - render a view
res.format()
res.location()
res.redirect()
res.get() - response header get
res.set() - header set
What is middleware:
functions that have access to req res object and next function
Request and Response Cycle
executes any code
can requst and response end
chang change req and res object
call next middleware by next()
throw and catch errors
Writing a Custom Middleware
Applicaiton Level Middleware
Router Level Middleware
error-handling middleware
built in middleware
express.json()
express.urlencoded()
express.static()
third party middleware
const middleware1 =(req, res, next)=>{
console.log("I am logging")
next()
}
app.use(middleware1)
app.get('/', (req, res)=>{
res.send('hello')
})
Using Named Function
Refactoring the Routes
router.all()
router.METHOD()
router.param()
router.route()
router.use()
route patterns
Error Handling Expressjs:
Error Handling for Synchronous Code:
Error Handling for Asynchronous Code:
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