auto-change-description

This simple library compares two JSONs and lists the differences found as changes.

The library checks for created, deleted or modified plain attributes. This is done using deep-diff.

Array attributes are treated as plain attributes and compared using deep-equal. If arrays contain any objects or other arrays, those are not separately considered.

Objects are finally treated recursively.

Install

With npm do:

npm i --save auto-change-description

Use

const acd = require('auto-change-description');
var results = acd.describe(before, after);

Example

Comparing these two JSONs:

    var before = {
        name: 'my object',
        puppy: 'yo',
        description: 'it\'s an object!',
        details: {
            it: 'has',
            an: 'array',
            with: ['a', 'few', 'elements']
        }
    };
    
    var after = {
        name: 'updated object',
        yo: 'puppy',
        description: 'it\'s an object!',
        details: {
            it: 'has',
            an: 'array',
            with: ['a', 'few', 'more', 'elements', {than: 'before'}]
        }
    };

Produces this output:

[
    'Deleted {puppy} with value (yo).',
    'Created {yo} with value (puppy).',
    'Modified {name} from (my object) to (updated object).',
    'Modified {details.with} from (["a","few","elements"]) to (["a","few","more","elements",{"than":"before"}]).'
]

The output was left as an array to allow free joining as people see fit, either with '\n' or '<br>' or whatever else.

The same logic was applied to {} and () wraps, to allow easy replacement with, for example, <strong></strong>, <em></em> or any other formatting syntaxes.