Package Exports

flat

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (flat) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

flat

Take a nested Javascript object and flatten it, or unflatten an object with delimited keys.

Installation

$ npm install flat

Methods

flatten(original, options)

Flattens the object - it'll return an object one level deep, regardless of how nested the original object was:

var flatten = require('flat')

flatten({
    key1: {
        keyA: 'valueI'
    },
    key2: {
        keyB: 'valueII'
    },
    key3: { a: { b: { c: 2 } } }
})

// {
//   'key1.keyA': 'valueI',
//   'key2.keyB': 'valueII',
//   'key3.a.b.c': 2
// }

unflatten(original, options)

Flattening is reversible too, you can call flatten.unflatten() on an object:

var unflatten = require('flat').unflatten

unflatten({
    'three.levels.deep': 42,
    'three.levels': {
        nested: true
    }
})

// {
//     three: {
//         levels: {
//             deep: 42,
//             nested: true
//         }
//     }
// }

Options

delimiter

Use a custom delimiter for (un)flattening your objects, instead of ..

safe

When enabled, both flat and unflatten will preserve arrays and their contents. This is disabled by default.

var flatten = require('flat')

flatten({
    this: [
        { contains: 'arrays' },
        { preserving: {
              them: 'for you'
        }}
    ]
}, {
    safe: true
})

// {
//     'this': [
//         { contains: 'arrays' },
//         { preserving: {
//             them: 'for you'
//         }}
//     ]
// }

object

When enabled, arrays will not be created automatically when using calling unflatten, like so:

unflatten({
    'hello.you.0': 'ipsum',
    'hello.you.1': 'lorem',
    'hello.other.world': 'foo'
}, { object: true })

// hello: {
//     you: {
//         0: 'ipsum',
//         1: 'lorem',
//     },
//     other: { world: 'foo' }
// }

overwrite

When enabled, existing keys in the unflattened object may be overwritten if they cannot hold a newly encountered nested value:

unflatten({
    'TRAVIS': 'true',
    'TRAVIS_DIR': '/home/travis/build/kvz/environmental'
}, { overwrite: true })

// TRAVIS: {
//     DIR: '/home/travis/build/kvz/environmental'
// }

Without overwrite set to true, the TRAVIS key would already have been set to a string, thus could not accept the nested DIR element.

This only makes sense on ordered arrays, and since we're overwriting data, should be used with care.

maxDepth

Maximum number of nested objects to flatten.

var flatten = require('flat')

flatten({
    key1: {
        keyA: 'valueI'
    },
    key2: {
        keyB: 'valueII'
    },
    key3: { a: { b: { c: 2 } } }
}, { maxDepth: 2 })

// {
//   'key1.keyA': 'valueI',
//   'key2.keyB': 'valueII',
//   'key3.a': { b: { c: 2 } }
// }