swaggerexpert/json-api-merge

JSON:API specific algorithm for merging included resources into original data.

JSON API Merge

@swaggerexpert/json-api-merge is a JSON:API specific redundant duplication algorithm for merging included resources into original data.

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Getting Started

Installation

npm i @swaggerexpert/json-api-merge

or

yarn add @swaggerexpert/json-api-merge

Usage

const jsonApiData = {
  data: {
    id: 1,
    type: 'resource',
    attributes: {
      name: 'Resource name',
    },
    relationships: {
      related: {
        data: {
          id: 2,
          type: 'related_resource',
        },
      },
    },
  },
  included: [
    {
      id: 2,
      type: 'related_resource',
      attributes: {
        name: 'Related resource name',
      },
    },
  ],
};

ES modules

import jsonApiMerge from '@swaggerexpert/json-api-merge'

jsonApiMerge(jsonApiData.included, jsonApiData.data)

CommonJS

const jsonApiMerge = require('@swaggerexpert/json-api-merge');

jsonApiMerge(jsonApiData.included, jsonApiData.data);

Result would be following data structure.

{
  id: 1,
  type: 'resource',
  attributes: {
   name: 'Resource name',
  },
  relationships: {
    related: {
      data: {
       id: 2,
       type: 'related_resource',
       attributes: {
         name: 'Related resource name',
       },
      },
    },
  },
}

The library can also process data in list format and can transform this:

{
  data: [
    {
      id: 1,
      type: 'resource',
      attributes: {
        name: 'Resource name',
      },
      relationships: {
        related: {
          data: {
            id: 2,
            type: 'related_resource',
          },
        },
      },
    }
  ],
  included: [
    {
      id: 2,
      type: 'related_resource',
      attributes: {
        name: 'Related resource name',
      },
    },
  ],
}

into this:

[
  {
    id: 1,
    type: 'resource',
    attributes: {
      name: 'Resource name',
    },
    relationships: {
      related: {
        data: {
          id: 2,
          type: 'related_resource',
          attributes: {
            name: 'Related resource name',
          },
        },
      },
    },
  }
]

Compound document

To reduce the number of HTTP requests, servers MAY allow responses that include related resources along with the requested primary resources. Such responses are called “compound documents”.

const jsonApiData = {
  data: [
    {
      type: 'articles',
      id: '1',
      attributes: {
        title: 'JSON:API paints my bikeshed!',
      },
      links: {
        self: 'http://example.com/articles/1',
      },
      relationships: {
        author: {
          links: {
            self: 'http://example.com/articles/1/relationships/author',
            related: 'http://example.com/articles/1/author',
          },
          data: { type: 'people', id: '9' },
        },
        comments: {
          links: {
            self: 'http://example.com/articles/1/relationships/comments',
            related: 'http://example.com/articles/1/comments',
          },
          data: [
            { type: 'comments', id: '5' },
            { type: 'comments', id: '12' },
          ],
        },
      },
    },
  ],
  included: [
    {
      type: 'people',
      id: '9',
      attributes: {
        firstName: 'Dan',
        lastName: 'Gebhardt',
        twitter: 'dgeb',
      },
      links: {
        self: 'http://example.com/people/9',
      },
    },
    {
      type: 'comments',
      id: '5',
      attributes: {
        body: 'First!',
      },
      relationships: {
        author: {
          data: { type: 'people', id: '2' },
        },
      },
      links: {
        self: 'http://example.com/comments/5',
      },
    },
    {
      type: 'comments',
      id: '12',
      attributes: {
        body: 'I like XML better',
      },
      relationships: {
        author: {
          data: { type: 'people', id: '9' },
        },
      },
      links: {
        self: 'http://example.com/comments/12',
      },
    },
  ],
};

Compound documents can achieve full linkage with the following trick:

const included = jsonApiMerge(jsonApiData.included, jsonApiData.included);
jsonApiMerge(included, jsonApiData.data);

This operation will generate following compound document with full linkage:

[
  {
    type: 'articles',
    id: '1',
    attributes: {
      title: 'JSON:API paints my bikeshed!',
    },
    links: {
      self: 'http://example.com/articles/1',
    },
    relationships: {
      author: {
        links: {
          self: 'http://example.com/articles/1/relationships/author',
          related: 'http://example.com/articles/1/author',
        },
        data: {
          type: 'people',
          id: '9',
          attributes: {
            firstName: 'Dan',
            lastName: 'Gebhardt',
            twitter: 'dgeb',
          },
          links: {
            self: 'http://example.com/people/9',
          },
        },
      },
      comments: {
        links: {
          self: 'http://example.com/articles/1/relationships/comments',
          related: 'http://example.com/articles/1/comments',
        },
        data: [
          {
            type: 'comments',
            id: '5',
            attributes: {
              body: 'First!',
            },
            relationships: {
              author: {
                data: {
                  type: 'people',
                  id: '2',
                },
              },
            },
            links: {
              self: 'http://example.com/comments/5',
            },
          },
          {
            type: 'comments',
            id: '12',
            attributes: {
              body: 'I like XML better',
            },
            relationships: {
              author: {
                data: {
                  type: 'people',
                  id: '9',
                  attributes: {
                    firstName: 'Dan',
                    lastName: 'Gebhardt',
                    twitter: 'dgeb',
                  },
                  links: {
                    self: 'http://example.com/people/9',
                  },
                },
              },
            },
            links: {
              self: 'http://example.com/comments/12',
            },
          },
        ],
      },
    },
  },
];

Motivation

I was looking for a simple way how to merge the included into data without compromising data structures. All other libraries that I tested were opinionated about how the resulting merge should look like. This library has no opinion and simply merged the included into data. It does nothing else.

Contributing

If you want to contribute to this project, please consult the CONTRIBUTING.md guidelines.

Obtaining project copy

 $ git clone https://github.com/swaggerexpert/json-api-merge
 $ npm i

Running tests

 $ npm run test

Running tests in browser

 $ npm run test:web

Running linter

We're using eslint and airbnb codestyle rules with prettier integrated as an eslint plugin.

 $ npm run lint

Typescript support

Although @swaggerexpert/json-api-merge is written in ES2019, we also support Typescript. When @swaggerexpert/json-api-merge gets imported into a Typescript project, typings are automatically imported and used.

Author

char0n (Vladimír Gorej)
contact@swaggerexpert.com
https://swaggerexport.com/