simple library for nodejs apps
npm install nk-node-util
- MVC Url params extractor
- [Encoding and Decoding JSON data] (#Encoding and Decoding JSON data)
use --save or --save-dev along with following command will save to package.json
```
npm i nk-node-util
` javscript`
var pkg = require('nk-node-util');
`
/books/:id => /books/24 (id is '24')
/movies/:moviename => /movies/civil-war (moviename is 'civil-war')
/:category/:categoryId => /food/1234 (category is 'food', categoryId is '1234')
`
Here we will parse that url and return collection of url params and those values, for e.g.,
#### Usage
` javascript
var parsed = pkg.parseUrl("/:category/:id", "/books/24");
console.log(parsed.IsMatch, parsed.Params); // true { category: 'books', id: '24' }
console.log('selected id : ', parsed.Params.id); //24
var parsed2 = pkg.parseUrl("/category/:id", "/books/24");
console.log(parsed2.IsMatch, parsed2.Params); //false {}
var parsed3 = pkg.parseUrl("/books/:id", "/books/24");
console.log(parsed3.IsMatch, parsed3.Params); //true { id: '24' }
`
As JSON is evary day element in our web development, we are dealing with JSON request and response, JSON database....etc.,
browser and server communicating in JSON format as it is simple, fast and easy to understand, parsing JSON is simpler than XML.
If we see below JSON object for holding list of objects, that having collection of objects, each object having two properties 'Id' and 'Name'
` javascript`
var data = [{"Id":0,"Name":"Jason Bourne"},{"Id":1,"Name":"Tony Stark"},{"Id":2,"Name":"Winter Soldier"}];
As you can see we are repeating property names in every object.And observe below format of JSON object which represents same object
` javascript`
var encodedData = {
"Properties": ["ID", "Name"],
"Data": [[1, "Jason Bourne"], [2, "Tony Stark"], [3, "Winter Soldier"]]
};
Now we are not repeating property names in each object instead we are seperating property names and data in symetric way.
#### Usage
If data having 10 records it wont make must difference in transfer(request and response time), But whenever dealing with bulk data more than 1000 records will make better in request/response time
##### Encoding
After encoding the size of JSON will reduced, that can be used in transfer(client-server or between servers)
` javascript
var data = [{"Id":0,"Name":"Jason Bourne"},{"Id":1,"Name":"Tony Stark"},{"Id":2,"Name":"Winter Soldier"}];
var encodedData = pkg.encodeData(data);
/*
console.log(encodedData);
//prints below data
{
"Properties": ["ID", "Name"],
"Data": [[1, "Jason Bourne"], [2, "Tony Stark"], [3, "Winter Soldier"]]
};
*/
`
Some numbers :
count of the Records : 10 ; Length of JSON Before Encoding : 241 ; After Encoding : 163 ~67%
count of the Records : 100 ; Length of JSON Before Encoding : 2581 ; After Encoding : 1423 ~55%
count of the Records : 10000 ; Length of JSON Before Encoding : 297781 ; After Encoding : 177818 ~60%
##### Decoding
Usage for decoding the endoced data previously. will generate actual JSON object to consume in application
` javascript
var encodedData = {
"Properties": ["ID", "Name"],
"Data": [[1, "Jason Bourne"], [2, "Tony Stark"], [3, "Winter Soldier"]]
};
var decodedData = pkg.decodeData(encodedData);
//[{"Id":0,"Name":"Jason Bourne"},{"Id":1,"Name":"Tony Stark"},{"Id":2,"Name":"Winter Soldier"}]
``
PS: For encoding/decoding use bower-component nk-js-util for client side encoding/decoding