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@activeprospect/flat
Advanced tools
Take a nested Javascript object and flatten it, or unflatten an object with delimited keys
[!NOTE] Originally forked to fix a bug where dot notation keys in a nested array were not unflattened, see https://github.com/activeprospect/flat/commit/27b5bfaaab986028dd9d8bb8027d5dce2e5a874b.
Fork is maintained because LeadConduit is not set up to easily consume ES modules, and the upstream package only ships an ESM package. This lib contains equivalent code, but maintains a CommonJS file format for compatibility with all LeadConduit integrations and applications.
Take a nested Javascript object and flatten it, or unflatten an object with delimited keys.
$ npm install flat
Flattens the object - it'll return an object one level deep, regardless of how nested the original object was:
const { 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
// }
Flattening is reversible too, you can call unflatten
on an object:
const { unflatten } = require('flat')
unflatten({
'three.levels.deep': 42,
'three.levels': {
nested: true
}
})
// {
// three: {
// levels: {
// deep: 42,
// nested: true
// }
// }
// }
Use a custom delimiter for (un)flattening your objects, instead of .
.
When enabled flatten
will preserve arrays and their contents. This is disabled by default.
const { flatten } = require('flat')
flatten({
this: [
{ contains: 'arrays' },
{ preserving: {
them: 'for you'
}}
]
}, {
safe: true
})
// {
// 'this': [
// { contains: 'arrays' },
// { preserving: {
// them: 'for you'
// }}
// ]
// }
When enabled, arrays will not be created automatically when 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' }
// }
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.
Maximum number of nested objects to flatten.
const { 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 } }
// }
Transform each part of a flat key before and after flattening.
const { flatten, unflatten } = require('flat')
flatten({
key1: {
keyA: 'valueI'
},
key2: {
keyB: 'valueII'
},
key3: { a: { b: { c: 2 } } }
}, {
transformKey: function(key){
return '__' + key + '__';
}
})
// {
// '__key1__.__keyA__': 'valueI',
// '__key2__.__keyB__': 'valueII',
// '__key3__.__a__.__b__.__c__': 2
// }
unflatten({
'__key1__.__keyA__': 'valueI',
'__key2__.__keyB__': 'valueII',
'__key3__.__a__.__b__.__c__': 2
}, {
transformKey: function(key){
return key.substring(2, key.length - 2)
}
})
// {
// key1: {
// keyA: 'valueI'
// },
// key2: {
// keyB: 'valueII'
// },
// key3: { a: { b: { c: 2 } } }
// }
flat
is also available as a command line tool. You can run it with npx
:
npx flat foo.json
Or install the flat
command globally:
npm i -g flat && flat foo.json
Accepts a filename as an argument:
flat foo.json
Also accepts JSON on stdin:
cat foo.json | flat
FAQs
Take a nested Javascript object and flatten it, or unflatten an object with delimited keys
We found that @activeprospect/flat demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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