json-api-reader

The api to parse messages in json-api-format into plain js-object, grouped in lookups or in lists.

Since version 1.1.0 the module also supports the reverse transformation to jsonApiEntity and to the jsonApiMessage.

Installation

npm i -D json-api-reader

Don't forget to add json-api-reader to the peerDependencies too.

Api

The module api is:

• readAsLookup - transforms json-api-message to set of entity-lookups
• readAsList - transforms json-api-message to set of entity-lists
• jsonApiEntity - transforms js-object to the valid json-api-entity
• jsonApiMessage - transforms set of js-objects to the json-api-message

In order to reduce snippets of json-messages the sample has been extracted to the file:
sample-message.json

Please get aware of it.

---

Transform json-api-message to set of lookups

readAsLookup:

message -> { entities, result }

Parameters

• message: Object - the message in json-api format as js-object

Returns: Object

• entities: { [collectionName]: { [id]: Object } } - lookup-object with keys that corespond to the type of entities mentioned in the json-api-message, and values that are also a lookup-objects containing objects' id's as keys and entities as values.

• result: any|any[] - the id or list of ids of entities recieved in message (in the data section)

Usage

import { readAsLookup } from 'json-api-reader/lib';
import message from 'json-api-reader/sample-message';


const lookups = readAsLookup(message);

console.log(
  JSON.stringify(lookups, null, '  ')
);

Prints:

{
  "entities": {
    "articles": {
      "1": {
        "id": "1",
        "title": "JSON API paints my bikeshed!",
        "author": "9",
        "comments": [
          "5",
          "12"
        ]
      }
    },
    "people": {
      "9": {
        "id": "9",
        "firstName": "Dan",
        "lastName": "Gebhardt",
        "twitter": "dgeb"
      }
    },
    "comments": {
      "5": {
        "id": "5",
        "body": "First!",
        "author": "2"
      },
      "12": {
        "id": "12",
        "body": "I like XML better",
        "author": "9"
      }
    }
  },
  "result": [
    "1"
  ]
}

---

Transform json-api-message to set of arrays

readAsList:

message -> { entities, result }

Parameters

• message: Object - the message in json-api format as js-object

Returns: Object

• entities: { [collectionName]: Object[] } - lookup-object with keys that corespond to the type of entities mentioned in the json-api-message, and values that are arrays of appropriate entities.

• result: any|any[] - the id or list of ids of entities recieved in message (in the data section)

Usage

import { readAsList } from 'json-api-reader/lib';
import message from 'json-api-reader/sample-message';


const list = readAsList(message);

console.log(
  JSON.stringify(list, null, '  ')
);

Prints:

{
  "entities": {
    "articles": [
      {
        "id": "1",
        "title": "JSON API paints my bikeshed!",
        "author": "9",
        "comments": [
          "5",
          "12"
        ]
      }
    ],
    "people": [
      {
        "id": "9",
        "firstName": "Dan",
        "lastName": "Gebhardt",
        "twitter": "dgeb"
      }
    ],
    "comments": [
      {
        "id": "5",
        "body": "First!",
        "author": "2"
      },
      {
        "id": "12",
        "body": "I like XML better",
        "author": "9"
      }
    ]
  },
  "result": [
    "1"
  ]
}

---

Transform js-object to the valid json-api-entity

jsonApiEntity:

({ type, refs?, attrs? }) -> jsObject -> { id?, type, attributes, relationships? }

Parameters:

• type: String - the type of entity to be translated to the json-api

• refs: String | String[] | { [fieldName]: Boolean | String } (optional) -- the object with keys correspond to the fields of jsObject. The values should be true, false (in order to ommit the field) or <entity-type> to be translated to the json-api. The refs parameter will be mapped to the relationships parameter of resulted entity. The string or an array of string will be interpreted as key names and values will be infered as true. If no value provided no releationships will be present in the result entity.

• attrs: String | String[] | { [fieldName]: Boolean | String } (optional) -- the object with keys that correspond to the fields of jsObject. The values could be true, false (in order to ommit field) or <entity-field-name> that be used as field name in json-api-entity. The attrs parameter will be mapped to the attributes field of resulted entity. The string or an array of string will be interpreted as key names and values will be infered as true. If no value provided then all fields of jsObject (excl. refs) will be mapped to the json-api-format.

Returns:

Anonymous Transforming Function:

jsObject -> { id?, type, attributes, relationships? }

Accepts:

• jsObject: Object - js-object to be transformed to the json-api-entity

Returns: json-api-entity:

• id: any (could be omitted) -- the id of entity calculated as jsObject.id
• type: String -- the type of entity. Corresponds to the type argument of jsonApiEntity
• attributes: Object -- the attributes of entity

Usage

import { jsonApiEntity } from 'json-api-reader/lib/reverse';

const accounts = jsonApiEntity({
  type: 'Accounts'
});

const entity = accounts({
  id: '2600-0-0000',
  title: 'Current Account',
});

console.log(
  JSON.stringify(entity, null, '  ')
);

Prints:

{
  "id": "2600-0-0000",
  "type": "accounts",
  "attributes": {
    "title": "Current Account"
  }
}

Another case:

import { jsonApiEntity } from 'json-api-reader/lib/reverse';
import { entities } from  'json-api-reader/test/__fixtures__/base-result-list';

const articles = jsonApiEntity({
  type: 'articles',
  refs: { author: 'people', comments: true },
});
const value = entities.articles[0];
console.log(
  JSON.stringify(articles(value), null, '  ')
);

Prints:

{
  "id": "1",
  "type": "articles",
  "attributes": {
    "title": "JSON API paints my bikeshed!"
  },
  "relationships": {
    "author": {
      "data": {
        "type": "people",
        "id": "9"
      }
    },
    "comments": {
      "data": [
        {
          "type": "comments",
          "id": "5"
        },
        {
          "type": "comments",
          "id": "12"
        }
      ]
    }
  }
}