Node Express - Revision history

AliIybar at 12:14, 2 November 2018

2018-11-02T12:14:13Z

2018-11-02T10:21:07Z

‎Parameters

2018-11-02T10:20:24Z

‎Parameters

2018-11-02T10:18:55Z

‎Querystring Parameters

2018-09-16T20:40:41Z

2018-09-16T20:22:58Z

2018-09-16T20:10:12Z

2018-09-16T20:09:22Z

2018-09-16T19:16:48Z

‎Sample app.js

2018-03-27T14:07:54Z

← Older revision		Revision as of 12:14, 2 November 2018
Line 179:		Line 179:
	res.send(course);		res.send(course);
	});		});
		+
		+	== Express Middlewares ==
		+	=== urlencoded middleware ===
		+	app.use(express.urlencoded({ extended:true }));
		+	=== static middleware ===
		+	app.use(express.static('public'));
		+	public is the folder name where we keep static files
		+
		+	when it's used it's like the root folder. ie : localhost:3000/readme.txt -> even readme.txt is in public folder we don't write it in url
		+	== Some Third Party Middlewares ==
		+	Check [http://expressjs.com/en/resources/middleware.html http://expressjs.com/en/resources/middleware.html]
		+	'''helmet''' to secure http calls
		+	'''morgan''' Http request logger
		+
		+	* install them first with npm i morgan
		+	* use require to import
		+	* app.use(... to use

@@ Line 130: / Line 130: @@
 === Parameters ===
   app.get('/api/courses/:id', (req, res) => {
-    res.send(req.params.id);
+    res.send(req.params);
   });
 it returns a json object with all parameters in it.

@@ Line 122: / Line 122: @@
-==== Parameter Sample ====
+=== Parameter Sample ===
   app.get('/api/courses/:id', (req, res) => {
      const course = sourses.find(c=> c.id === parseInt(req.params.id));
@@ Line 128: / Line 128: @@
      res.send(course);
   });
-=== Querystring Parameters ===
+=== Parameters ===
   app.get('/api/courses/:id', (req, res) => {
     res.send(req.params.id);
   });
 it returns a json object with all parameters in it.
-==== Multiple Parameters
+=== Multiple Parameters ===
   app.get('/api/courses/:id/:other', (req, res) => {
     res.send(req.params.id);
     //   res.send(req.params); // to display all params in json format
   });
-==== Querystring Parameters ====
+=== Querystring Parameters ===
 for optional parameters
   localhost:3000/api/posts/2018/1?sortBy=name

@@ Line 130: / Line 130: @@
 === Querystring Parameters ===
   app.get('/api/courses/:id', (req, res) => {
-    res.send(req.query);
+    res.send(req.params.id);
   });
 it returns a json object with all parameters in it.
 == Handling POST requests ==
   app.use(express.json()); // to parse body object

← Older revision		Revision as of 20:40, 16 September 2018
Line 133:		Line 133:
	});		});
	it returns a json object with all parameters in it.		it returns a json object with all parameters in it.
		+	== Handling POST requests ==
		+	app.use(express.json()); // to parse body object
		+	....
		+	app.post('/api/courses', (req, res) ={
		+	const course = {
		+	id : courses.length + 1,
		+	name : req.body.name
		+	}
		+	courses.push(course);
		+	res.send(course);
		+	});
		+	=== Input validation ===
		+	npm i joi
		+
		+	const Joi = require('joi'); //-> it's pascal case because it returns a function
		+	...
		+	app.post('/api/courses', (req, res) ={
		+	const schema = {
		+	name:Joi.string().min(3).required()
		+	};
		+	const result = Joi.validate(req.body, schema); / in resut either error or value property becomes null.
		+	if(result.error) {
		+	res.status(400).send(result.error);
		+	// Or with shorter message like
		+	//res.status(400).send(result.error.details[0].message);
		+	return;
		+	}
		+
		+	const course = {
		+	id : courses.length + 1,
		+	name : req.body.name
		+	}
		+	courses.push(course);
		+	res.send(course);
		+	});

← Older revision		Revision as of 20:22, 16 September 2018
Line 115:		Line 115:
	in win		in win
	set PORT =5000		set PORT =5000
		+	== Parameters ==
		+	app.get('/api/courses/:id', (req, res) => {
		+	res.send(req.params.id);
		+	});
		+	req.params -> returns a json object with all parameters in it.
		+
		+
		+	==== Parameter Sample ====
		+	app.get('/api/courses/:id', (req, res) => {
		+	const course = sourses.find(c=> c.id === parseInt(req.params.id));
		+	if (!course) res.status(404).send('This course with the given ID was not found');
		+	res.send(course);
		+	});
		+	=== Querystring Parameters ===
		+	app.get('/api/courses/:id', (req, res) => {
		+	res.send(req.query);
		+	});
		+	it returns a json object with all parameters in it.

@@ Line 82: / Line 82: @@
 </pre>
 == Sample app.js ==
 <pre>
 var express = require('express');

← Older revision		Revision as of 20:09, 16 September 2018
Line 101:		Line 101:
	});		});
	</pre>		</pre>
		+
		+	=== Environment Variables ===
		+	using '''process.env.PORT'''
		+	<pre>
		+	const port = process.env.PORT \|\| 3000
		+
		+	app.listen(port,()=>{
		+	console.log('Server started on port ' + port);
		+	});
		+	</pre>
		+	setting env var in Mac
		+	export PORT=5000
		+	in win
		+	set PORT =5000

@@ Line 78: / Line 78: @@
 var port = 3000;
 app.listen(port, function(){
 console.log('Server started on port ' + port);
 });
 </pre>

@@ Line 6: / Line 6: @@
 Express is web framework for Node that makes it easy to build web applications. While it is very much possible to build any web application just using Node, Express provides higher-level building blocks and the patterns to stack parts together which makes web development easier.
-  npm install -g express
+  npm install --save express ejs
 == Key Pieces of Express ==
@@ Line 60: / Line 60: @@
 In essence, Express is an simple routing and middleware web framework with minimal functionality of its own but instead added to it via third-party middleware.