Uni-flatten NPM

Features

Installation

$ npm i --save uni-flatten

Inspiration

There are various popular modules to flatten an object, but they lost context such as numeric keys, dot in object key, special characters etc. These behaviors disabled converting flattened object to original object. This is when uni-flatten becomes handy.

Quick Start

Flatten a nested object

import { flatten } from 'uni-flatten';

flatten({
  a: {
    b: {
      c: 123,
    },
    d: [
      {
        e: { f: 456 },
      },
    ],
  },
  'a.b.c': 789,
});
/*
result:
{
  'a.b.c': 123, // normal nested object
  'a.d[0].e.f': 456, // nested object array, use brackets to represent array index
  '["a.b.c"]': 789, // object with special character in keys
},
*/

Unflatten a flat object

import { unflatten } from 'uni-flatten';

unflatten({
  'a.b.c': 123, // normal nested object
  'a.d[0].e.f': 456, // nested object array, use brackets to represent array index
  '["a.b.c"]': 789, // object with special character in keys
});
/*
result:
{
  a: {
    b: {
      c: 123,
    },
    d: [
      {
        e: { f: 456 },
      },
    ],
  },
  'a.b.c': 789,
}
*/

Flatten a cyclic object

Circular references are serialized as [Circular->"<path>"] when flattened, which is useful for unflattening.

import { flatten, unflatten } from 'uni-flatten';

const obj = { a: { b: { c: 1 } } };
obj.a.d = obj.a;
const flattened = flatten(obj); // { 'a.b.c': 1, 'a.d': '[Circular->"a"]' }
const restored = unflatten(obj); // { a: <ref *1> { b: { c: 1 }, d: [Circular *1] }