Jsona

Framework agnostic, customizable library that provide data formatters to simplify work with JSON API v1.0 specification.


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When you work with API standardized to json:api specification, you're dealing with a special and optimized JSON data format in the request and response body.
You can get data of several entities that are related to each other, but you'll receive it in array (included).
You may need to send modified back to server (or new data) in accordance with specification.

This may puzzle you with the following questions:

* How to get necessary entity from included array many times more inconvenient and optimal?
* How to describe data from server, working with typings (TypeScript, Flow)?
* How to send JSON to the server without manually assembling JSON in accordance with specification?

Jsona solves this problems by providing:
* converter from JSON to simplified objects (some denormalized structure, wich is easy to typify)
* converter from simplified objects to JSON (in according with json:api specification)
* converter from "reduxObject" to simplified objects (reduxObject is a result object of json-api-normalizer)

NOTE: This README describes latest stable version. You can read README for old versions 0.2.x here

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``
npm i jsona --save
`
or

`
yarn add jsona
`




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You need to instantiate Jsona once, then use its public methods to convert data.
`javascript
import Jsona from 'jsona';
const dataFormatter = new Jsona();
`

#### deserialize - creates simplified object(s) from json
`javascript
const json = {
data: {
type: 'town',
id: '123',
attributes: {
name: 'Barcelona'
},
relationships: {
country: {
data: {
type: 'country',
id: '32'
}
}
}
},
included: [{
type: 'country',
id: '32',
attributes: {
name: 'Spain'
}
}]
};

const town = dataFormatter.deserialize(json);
console.log(town); // will output:
/* {
type: 'town',
id: '123',
name: 'Barcelona',
country: {
type: 'country',
id: '32',
name: 'Spain'
},
relationshipNames: ['country']
} */
`

#### serialize - creates json from simplified object(s)
`javascript
const user = {
type: 'user',
id: 1,
categories: [{ type: 'category', id: '1', name: 'First category' }],
town: {
type: 'town',
id: '123',
name: 'Barcelona',
country: {
type: 'country',
id: '32',
name: 'Spain'
},
relationshipNames: ['country']
},
relationshipNames: ['categories', 'town']
};

const newJson = dataFormatter.serialize({
stuff: user, // can handle array
includeNames: ['categories', 'town.country'] // can include deep relations via dot
});

console.log(newJson); // will output:
/* {
data: {
type: 'user',
id: 1,
relationships: {
categories: {
data: [{ type: 'category', id: '1' }]
},
town: {
data: { type: 'town', id: '123' }
}
}
},
included: [{
type: 'category',
id: '1',
attributes: {
name: 'First category',
}
}, {
type: 'town',
id: '123',
attributes: {
name: 'Barcelona',
},
relationships: {
country: {
data: {
type: 'country',
id: '32',
}
}
}
}, {
type: 'country',
id: '32',
attributes: {
name: 'Spain',
}
}]
}*/
`

#### denormalizeReduxObject - creates simplified object(s) from reduxObject
"reduxObject" - result object of json-api-normalizer

`javascript
const reduxObject = reduxStore.entities; // depends on where you store it
const town = dataFormatter.denormalizeReduxObject({reduxObject, entityType: 'town', entityIds: '123'});
console.log(town); // if there is such town and country in reduxObject, it will output:
/* {
type: 'town',
id: '123',
name: 'Barcelona',
country: {
type: 'country',
id: '34',
name: 'Spain'
},
relationshipNames: ['country']
} */
`

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#### Build process and property names
You can control process of building simplified objects, just use your own propertyMappers when Jsona instantiates.

With IJsonPropertiesMapper you can implement your way of creation simplified objects (data models) from JSON, with IModelPropertiesMapper implement how to give back values from data model to JSON.

It gives unlimited possibilities to integrate Jsona with react, redux, angular2

Example of passing your own propertyMappers to Jsona:
`javascript
import Jsona from 'jsona';
import {MyModelPropertiesMapper, MyJsonPropertiesMapper} from 'myPropertyMappers';

export default const dataFormatter = new Jsona({
modelPropertiesMapper: MyModelPropertiesMapper,
jsonPropertiesMapper: MyJsonPropertiesMapper
});
`
Also, there is built-in switchCasePropertyMappers, that you can use if need to automatically transform property names from kebab, snake, camel case and back.

#### Cache
For faster creation of simplified objects from json, it uses a cache for already processed json-entity, see DeserializeCache that uses by default.
It possible to provide your own IDeserializeCache manager:
`javascript
import Jsona from 'jsona';
import {MyOwnDeserializeCache} from './index';

export default const dataFormatter = new Jsona({
DeserializeCache: MyOwnDeserializeCache
});
``

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Jsona, examples provided in this repository and in the documentation are MIT licensed.