Javascript unflatten array/change datastructure - javascript

So heres the problem and heres the fiddle: https://jsfiddle.net/6zqco0mj/
const start = [{'a':'b'}, {'b':'c'}, {'c':'d'}, {'d':'e'}]
end =
{a:
{b:
{c:
{
d: {}
}
}
}
}
I have some code but not sure how would I dig deeper into an object
const start = [{'b':'c'}, {'a':'b'}, {'c':'d'}, {'d':'e'}];
const end = {};
function convert(key) {
const obj = getObj(key);
if(obj) {
const temp = {};
temp[obj[key]] = convert(obj[key]);
//findKey(obj[key]);
end[key] = temp;
}
}
function getObj(key) {
const foo = start.find((el, i) => { if(el[key]) { return el[key] } });
return foo;
}
function findKey(k) {
// what goes here?
}
convert('a');
console.log(end);


i think you went in the other way around for your aproach of recursivity; i gave it a try and this is what i got so far
const start = [{'b':'c'}, {'a':'b'}, {'c':'d'}, {'d':'e'}];
function convert(key, object) {
const obj = getObj(key);
if(obj) {
object[obj[key]] = {};
convert(obj[key], object[obj[key]]);
}
}
function getObj(key) {
const foo = start.find((el, i) => { if(el[key]) { return el[key] }});
return foo;
}
const end = { a: {}};
convert('a', end.a);
console.log(end);


You could use an object structure for collecting the data and build the tree.
This solutiotion works with unsorted data.
For getting the root properties, all keys and values are collected and only the subset is taken.
var data = [{ d: 'e' }, { b: 'c' }, { c: 'd' }, { a: 'b' }, { b : 'z' }],
tree = function (data) {
var keys = new Set,
values = new Set,
r = Object.create(null);
data.forEach(function (o) {
var [key, value] = Object.entries(o)[0];
keys.add(key);
values.add(value);
r[value] = r[value] || {};
r[key] = r[key] || {};
r[key][value] = r[key][value] || r[value];
});
values.forEach(v => keys.delete(v));
return Object.assign(...Array.from(keys, k => ({ [k]: r[k] })));
}(data);
console.log(tree);
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Related

Get parent, grandparent and key in the deep nested object structure

I have a deeply nested structure in the javascript object without any arrays in it.
var data = {
bar: 'a',
child: {
b: 'b',
grand: {
greatgrand: {
c: 'c'
}
}
}
};
let arr = [];
const findParentGrandparent = (obj, target) => {
Object.entries(obj).forEach(child => {
if (typeof child[1] === 'object') {
findParentGrandparent(child[1]);
}
});
};
findParentGrandparent(data, 'c');
When I call the function with a target, I want to get the taget key itself, parent and grandparent.
For example, if the target is 'c', arr should become
['c', 'greatgrand', 'grand', 'child'];
if target is 'greatgrand', it should become
['greatgrand', 'grand', 'child'];
Thanks

I did it using your recursive pattern, you can change the way it handle errors also, here I throw if there is no result.
var data = {
bar: 'a',
child: {
b: 'b',
grand: {
greatgrand: {
c: 'c'
}
}
}
};
let arr = [];
const findParentGrandparent = (obj, target) => {
for (const child of Object.entries(obj)) {
if (typeof child[1] === 'object' && child[0] !== target) {
const result = findParentGrandparent(child[1], target);
return [...result, child[0]];
} else if (child[0] === target) {
return [child[0]];
}
};
throw new Error("not found"); // If it goes there the object is not found, you can throw or return a specific flag, as you wish.
};
console.log(findParentGrandparent(data, 'c'));

var data = {
bar: 'a',
child: {
b: 'b',
grand: {
greatgrand: {
c: 'c'
}
}
}
};
/**
* #param validate {boolean} = true - Pass true if need to check for existance of `target`
*/
const findParentGrandparent = (obj, target, validate = true) => {
let result = [];
for (let [key, value] of Object.entries(obj)) {
if (key === target) {
result.push(key);
break;
}
if (value.toString() === '[object Object]') {
result.push(key);
result = result.concat(findParentGrandparent(value, target, false))
}
}
if (validate && !result.includes(target)) {
return 'Not found';
}
return result;
};
let resultC = findParentGrandparent(data, 'c').reverse();
let resultGreatgrand = findParentGrandparent(data, 'greatgrand').reverse();
console.log('Result for "c":', resultC);
console.log('Result for "greatgrand":', resultGreatgrand);

You can use a recursive generator function:
function* get_vals(d, target, c = []){
for (var i of Object.keys(d)){
if (i === target){
yield [target, ...c.slice(0, 3)]
}
if (typeof d[i] === 'object'){
yield* get_vals(d[i], target, c = [i, ...c])
}
}
}
var result = get_vals(data, 'c').next().value
Output:
["c", "greatgrand", "grand", "child"]

Need to convert the array of filepaths into treeview json object

Need to convert the array of file paths into Treeview JSON object
Array Data:
[path1/subpath1/file1.doc",
"path1/subpath1/file2.doc",
"path1/subpath2/file1.doc",
"path1/subpath2/file2.doc",
"path2/subpath1/file1.doc",
"path2/subpath1/file2.doc",
"path2/subpath2/file1.doc",
"path2/subpath2/file2.doc",
"path2/subpath2/additionalpath1/file1.doc"]
I want below object Result:
{
"title": "path1",
"childNodes" : [
{ "title":"subpath1", "childNodes":[{ "title":"file1.doc", "childNodes":[] }] },
{ "title":"subpath2", "childNodes":[{ "title":"file1.doc", "childNodes":[] }] }
]
}
I was able to convert it into an object using the below code snippet but not able to transform the way I want it
let treePath = {};
let formattedData = {};
data.forEach(path => {
let levels = path.split("/");
let file = levels.pop();
let prevLevel = treePath;
let prevProp = levels.shift();
levels.forEach(prop => {
prevLevel[prevProp] = prevLevel[prevProp] || {};
prevLevel = prevLevel[prevProp];
prevProp = prop;
});
prevLevel[prevProp] = (prevLevel[prevProp] || []).concat([file]);
});
How can i do this????

You could reduce the parts of pathes and search for same title.
const
pathes = ["path1/subpath1/file1.doc", "path1/subpath1/file2.doc", "path1/subpath2/file1.doc", "path1/subpath2/file2.doc", "path2/subpath1/file1.doc", "path2/subpath1/file2.doc", "path2/subpath2/file1.doc", "path2/subpath2/file2.doc", "path2/subpath2/additionalpath1/file1.doc"],
result = pathes.reduce((r, path) => {
path.split('/').reduce((childNodes, title) => {
let child = childNodes.find(n => n.title === title);
if (!child) childNodes.push(child = { title, childNodes: [] });
return child.childNodes;
}, r);
return r;
}, []);
console.log(result);
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Create a object i an object based on the array of string value

I need to update the object name based on the array of the string value and the last string value should be an array.
I use array.forEach loop but I don't know how to find the object inside an object if it exists and the myArray contain around 10,000 strings.
const myArray = [
'/unit/unit/225/unit-225.pdf',
'/nit/nit-dep/4.11/nit-4.11.pdf',
'/nit/nit-dep/4.12/nit-4.12.pdf',
'/org/viti/viti-engine/5.1/viti-engine-5.1.pdf',
'/org/viti/viti-spring/5.1/viti-spring-5.1.pdf'
];
var parentObject = {}
myArray.forEach(res => {
res = res.slice(1, res.length);
var array = res.split("/");
array.forEach((e, i) => {
........ // here I am confused
});
})
final output should be
parentObject = {
'unit': {
'unit': {
'225': {
'unit-225.pdf': []
}
}
},
'nit': {
'nit-dep': {
'4.11': {
'nit-4.11.pdf': []
},
'4.12': {
'nit-4.12.pdf': []
}
}
},
'org': {
'viti': {
'viti-engine': {
'5.1': {
'viti-engine-5.1.pdf': []
}
},
'viti-spring': {
'5.2': {
'viti-engine-5.2.pdf': []
}
}
}
}
}

Once you've split by slashes, use reduce to iterate to the nested object, creating each nested property first if necessary, then assign an array to the filename property:
const myArray = [
'/unit/unit/225/unit-225.pdf',
'/nit/nit-dep/4.11/nit-4.11.pdf',
'/nit/nit-dep/4.12/nit-4.12.pdf',
'/org/viti/viti-engine/5.1/viti-engine-5.1.pdf',
'/org/viti/viti-spring/5.1/viti-spring-5.1.pdf'
];
var parentObject = {}
myArray.forEach((str) => {
const props = str.slice(1).split('/');
const filename = props.pop();
const lastObj = props.reduce((a, prop) => {
if (!a[prop]) {
a[prop] = {};
}
return a[prop];
}, parentObject);
lastObj[filename] = [];
});
console.log(parentObject);

You could reduce the array an reduce the path as well. At the end assign the array.
const
array = ['/unit/unit/225/unit-225.pdf', '/nit/nit-dep/4.11/nit-4.11.pdf', '/nit/nit-dep/4.12/nit-4.12.pdf', '/org/viti/viti-engine/5.1/viti-engine-5.1.pdf', '/org/viti/viti-spring/5.1/viti-spring-5.1.pdf'],
result = array.reduce((r, path) => {
var keys = path.split(/\//).slice(1),
last = keys.pop();
keys.reduce((o, k) => o[k] = o[k] || {}, r)[last] = [];
return r;
}, {});
console.log(result);
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A slightly faster approach.
const
array = ['/unit/unit/225/unit-225.pdf', '/nit/nit-dep/4.11/nit-4.11.pdf', '/nit/nit-dep/4.12/nit-4.12.pdf', '/org/viti/viti-engine/5.1/viti-engine-5.1.pdf', '/org/viti/viti-spring/5.1/viti-spring-5.1.pdf'],
result = {};
for (let path of array) {
let keys = path.split(/\//).slice(1),
last = keys.pop(),
temp = result;
for (let key of keys) {
temp[key] = temp[key] || {};
temp = temp[key];
}
temp[last] = [];
}
console.log(result);
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You could also take a recursive approach.
Just keep shifting the split-up path until you get the final assignment for each branch.
const myArray = [
'/unit/unit/225/unit-225.pdf',
'/nit/nit-dep/4.11/nit-4.11.pdf',
'/nit/nit-dep/4.12/nit-4.12.pdf',
'/org/viti/viti-engine/5.1/viti-engine-5.1.pdf',
'/org/viti/viti-spring/5.1/viti-spring-5.1.pdf'
];
console.log(buildTree(myArray));
function buildTree(list=[]) {
return list.reduce((node, item) => buildBranches(node, item.split(/\//g).filter(x => x !== '')), {});
}
function buildBranches(node={}, rest=[]) {
let key = rest.shift();
node[key] = rest.length < 2 ? { [rest.shift()] : [] } /** or rest.shift() */ : node[key] || {};
if (rest.length > 1) buildBranches(node[key], rest);
return node;
}
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How to form a nested javascript object using a string with dots as property hierarchy

I have a mapping object in which property and Value looks like below :
var obj = {
key: "key1.key2.key3.key4"
};
How to convert obj to nested javascript object as shown below:
var returnObj = {
key1: {
key2: {
key3:{
key4: {
"value": key
}
}
}
}
};

You could iterate the keys and then split the string for single properties. Then create objects, if not exists. Later assign the original key as value.
function convert(object) {
var result = {};
Object.keys(object).forEach(function (k) {
object[k].split('.').reduce(function (o, k) {
return o[k] = o[k] || {};
}, result).value = k;
});
return result;
}
var obj = { key: "key1.key2.key3.key4" };
console.log(convert(obj));
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With last key as key.
function convert(object) {
var result = {};
Object.keys(object).forEach(function (k) {
var path = object[k].split('.'),
last = path.pop();
path.reduce(function (o, k) {
return o[k] = o[k] || {};
}, result)[last] = k;
});
return result;
}
var obj = { key: "key1.key2.key3.key4" };
console.log(convert(obj));
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Convert returned JSON Object Properties to (lower first) camelCase

I have JSON returned from an API like so:
Contacts: [{ GivenName: "Matt", FamilyName: "Berry" }]
To keep this consistent with my code style (camelCase - lower case first letter) I want to transform the array to produce the following:
contacts: [{ givenName: "Matt", familyName: "Berry" }]
What's the easiest/best way to do this? Create a new Contact object and iterate over all the contacts in the returned array?
var jsonContacts = json["Contacts"],
contacts= [];
_.each(jsonContacts , function(item){
var contact = new Contact( item.GivenName, item.FamilyName );
contacts.push(contact);
});
or can I map the original array or transform it somehow?

If you would use lodash instead of underscore, this would do:
_.mapKeys(obj, (v, k) => _.camelCase(k))
This would convert both TitleCase and snake_case to camelCase. Note that it is not recursive though.

Here's a reliable, recursive function that will properly camelCase all of a JavaScript object's properties:
function toCamel(o) {
var newO, origKey, newKey, value
if (o instanceof Array) {
return o.map(function(value) {
if (typeof value === "object") {
value = toCamel(value)
}
return value
})
} else {
newO = {}
for (origKey in o) {
if (o.hasOwnProperty(origKey)) {
newKey = (origKey.charAt(0).toLowerCase() + origKey.slice(1) || origKey).toString()
value = o[origKey]
if (value instanceof Array || (value !== null && value.constructor === Object)) {
value = toCamel(value)
}
newO[newKey] = value
}
}
}
return newO
}
Test:
var obj = {
'FirstName': 'John',
'LastName': 'Smith',
'BirthDate': new Date(),
'ArrayTest': ['one', 'TWO', 3],
'ThisKey': {
'This-Sub-Key': 42
}
}
console.log(JSON.stringify(toCamel(obj)))
Output:
{
"firstName":"John",
"lastName":"Smith",
"birthDate":"2017-02-13T19:02:09.708Z",
"arrayTest": [
"one",
"TWO",
3
],
"thisKey":{
"this-Sub-Key":42
}
}

You can do this with this recursive function (with lodash and ES6):
import { camelCase } from 'lodash';
const camelizeKeys = (obj) => {
if (Array.isArray(obj)) {
return obj.map(v => camelizeKeys(v));
} else if (obj != null && obj.constructor === Object) {
return Object.keys(obj).reduce(
(result, key) => ({
...result,
[camelCase(key)]: camelizeKeys(obj[key]),
}),
{},
);
}
return obj;
};
Test:
const obj = {
'FirstName': 'John',
'LastName': 'Smith',
'BirthDate': new Date(),
'ArrayTest': ['one', 'TWO', 3],
'ThisKey': {
'This-Sub-Key': 42
}
}
console.log(JSON.stringify(camelizeKeys(obj)))
Output:
{
"firstName": "John",
"lastName": "Smith",
"birthDate": "2018-05-31T09:03:57.844Z",
"arrayTest":[
"one",
"TWO",
3
],
"thisKey":{
"thisSubKey": 42
}
}

To change a plain object's keys from snake_case to camelCase recursively try the following
(which uses Lodash):
function objectKeysToCamelCase(snake_case_object) {
var camelCaseObject = {};
_.forEach(
snake_case_object,
function(value, key) {
if (_.isPlainObject(value) || _.isArray(value)) { // checks that a value is a plain object or an array - for recursive key conversion
value = objectKeysToCamelCase(value); // recursively update keys of any values that are also objects
}
camelCaseObject[_.camelCase(key)] = value;
}
)
return camelCaseObject;
};
test in this PLUNKER
Note: also works recursively for objects within arrays

Using lodash and ES6, this will replace all keys recursively to camelcase:
const camelCaseKeys = (obj) => {
if (!_.isObject(obj)) {
return obj;
} else if (_.isArray(obj)) {
return obj.map((v) => camelCaseKeys(v));
}
return _.reduce(obj, (r, v, k) => {
return {
...r,
[_.camelCase(k)]: camelCaseKeys(v)
};
}, {});
};

Just use humps
humps.camelize('hello_world');
humps.camelizeKeys(object, options); // will work through entire object
https://www.npmjs.com/package/humps

This is a great use case for axios interceptors
Basically, define a client class and attach a before/after interceptor that converts the request/response data.
export default class Client {
get(url, data, successCB, catchCB) {
return this._perform('get', url, data, successCB, catchCB);
}
post(url, data, successCB, catchCB) {
return this._perform('post', url, data, successCB, catchCB);
}
_perform(method, url, data, successCB, catchCB) {
// https://github.com/axios/axios#interceptors
// Add a response interceptor
axios.interceptors.response.use((response) => {
response.data = toCamelCase(response.data);
return response;
}, (error) => {
error.data = toCamelCase(error.data);
return Promise.reject(error);
});
// Add a request interceptor
axios.interceptors.request.use((config) => {
config.data = toSnakeCase(config.data);
return config;
}, (error) => {
return Promise.reject(error);
});
return axios({
method: method,
url: API_URL + url,
data: data,
headers: {
'Content-Type': 'application/json',
},
}).then(successCB).catch(catchCB)
}
}
Here's a gist with a longer example using React/axios.

there's a nice npm module for this..
https://www.npmjs.com/package/camelcase-keys
npm install camelcase-keys
const camelcaseKeys = require( "camelcase-keys" );
camelcaseKeys( { Contacts: [ { GivenName: "Matt", FamilyName: "Berry" } ] }, { deep: true } );
will return...
{ contacts: [ { givenName: "Matt", familyName: "Berry" } ] }

This solution based on the plain js solution above, uses loadash and Keeps an array if passed as a parameter and Only change the Keys
function camelCaseObject(o) {
let newO, origKey, value
if (o instanceof Array) {
newO = []
for (origKey in o) {
value = o[origKey]
if (typeof value === 'object') {
value = camelCaseObject(value)
}
newO.push(value)
}
} else {
newO = {}
for (origKey in o) {
if (o.hasOwnProperty(origKey)) {
newO[_.camelCase(origKey)] = o[origKey]
}
}
}
return newO
}
// Example
const obj = [
{'my_key': 'value'},
{'Another_Key':'anotherValue'},
{'array_key':
[{'me_too':2}]
}
]
console.log(camelCaseObject(obj))
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.js"></script>

Using lodash, you can do it like this:
export const toCamelCase = obj => {
return _.reduce(obj, (result, value, key) => {
const finalValue = _.isPlainObject(value) || _.isArray(value) ? toCamelCase(value) : value;
return { ...result, [_.camelCase(key)]: finalValue };
}, {});
};

Well I took up the challenge and think I figured it out:
var firstToLower = function(str) {
return str.charAt(0).toLowerCase() + str.slice(1);
};
var firstToUpper = function(str) {
return str.charAt(0).toUpperCase() + str.slice(1);
};
var mapToJsObject = function(o) {
var r = {};
$.map(o, function(item, index) {
r[firstToLower(index)] = o[index];
});
return r;
};
var mapFromJsObject = function(o) {
var r = {};
$.map(o, function(item, index) {
r[firstToUpper(index)] = o[index];
});
return r;
};
// Map to
var contacts = [
{
GivenName: "Matt",
FamilyName: "Berry"
},
{
GivenName: "Josh",
FamilyName: "Berry"
},
{
GivenName: "Thomas",
FamilyName: "Berry"
}
];
var mappedContacts = [];
$.map(contacts, function(item) {
var m = mapToJsObject(item);
mappedContacts.push(m);
});
alert(mappedContacts[0].givenName);
// Map from
var unmappedContacts = [];
$.map(mappedContacts, function(item) {
var m = mapFromJsObject(item);
unmappedContacts.push(m);
});
alert(unmappedContacts[0].GivenName);
Property converter (jsfiddle)
The trick is handling the objects as arrays of object properties.

Here's handy library you might wanna try:
https://www.npmjs.com/package/camelize2
You simply need to install it with npm install --save camelize2 and then
const camelize = require('camelize2')
const response = {
Contacts: [{ GivenName: "Matt", FamilyName:"Berry" }]
}
const camelizedResponse = camelize(response)

Solution similar to #brandonscript, but in more ES6-functional way:
const camelCaseString = str => (
(str.charAt(0).toLowerCase() + str.slice(1) || str).toString()
);
const objectToCamelCase = val => {
if (typeof val != 'object' || val === null) {
return val;
}
if (val instanceof Array) {
return val.map(objectToCamelCase);
}
return Object.keys(val)
.filter(prop => val.hasOwnProperty(prop))
.map(prop => ({[camelCaseString(prop)]: objectToCamelCase(val[prop])}))
.reduce((prev, current) => ({...prev, ...current}))
};
// Example:
let converted = objectToCamelCase({UserId: 1, Hobbies: [{Id: 1, Label: "Read"}], Name: "John Doe"});
console.log(converted)

I needed a generic method that accepted an array or object. This is what I'm using (I borrowed KyorCode's firstToLower() implementation):
function convertKeysToCamelCase(obj) {
if (!obj || typeof obj !== "object") return null;
if (obj instanceof Array) {
return $.map(obj, function(value) {
return convertKeysToCamelCase(value);
});
}
var newObj = {};
$.each(obj, function(key, value) {
key = key.charAt(0).toLowerCase() + key.slice(1);
if (typeof value == "object" && !(value instanceof Array)) {
value = convertKeysToCamelCase(value);
}
newObj[key] = value;
});
return newObj;
};
Example calls:
var contact = { GivenName: "Matt", FamilyName:"Berry" };
console.log(convertKeysToCamelCase(contact));
// logs: Object { givenName="Matt", familyName="Berry"}
console.log(convertKeysToCamelCase([contact]));
// logs: [Object { givenName="Matt", familyName="Berry"}]
console.log(convertKeysToCamelCase("string"));
// logs: null
console.log(contact);
// logs: Object { GivenName="Matt", FamilyName="Berry"}

Took the challenge with lodash and some es6+ features
Here is my implementation with the reduce function.
function deeplyToCamelCase(obj) {
return _.reduce(obj, (camelCaseObj, value, key) => {
const convertedDeepValue = _.isPlainObject(value) || _.isArray(value)
? deeplyToCamelCase(value)
: value;
return { ...camelCaseObj, [_.camelCase(key)] : convertedDeepValue };
}, {});
};

Use lodash ...
function isPrimitive (variable) {
return Object(variable) !== variable
}
function toCamel (variable) {
if (isPrimitive(variable)) {
return variable
}
if (_.isArray(variable)) {
return variable.map(el => toCamel(el))
}
const newObj = {}
_.forOwn(variable, (value, key) => newObj[_.camelCase(key)] = toCamel(value))
return newObj
}

This function loop recursively through the object keys and using lodash returns a new object with every field converted to camelCase. It works also with arrays, nested arrays, nested objects.
function deepCamelCase (obj) {
const c = {}
if (typeof obj !== 'object') return obj
_.mapKeys(obj, (v, k) => {
let w = {}
if (typeof v === 'object') {
if (Array.isArray(v)) {
const k = []
for (const i of v) {
k.push(deepCamelCase(i))
}
} else {
_.mapValues(v, (n, m) => {
if (Array.isArray(n)) {
const k = []
for (const i of n) {
k.push(deepCamelCase(i))
}
w[_.camelCase(m)] = k
} else {
w[_.camelCase(m)] = deepCamelCase(n)
}
})
}
} else {
w = v
}
c[_.camelCase(k)] = w
})
return c
}

Updated code using the reference from https://plnkr.co/edit/jtsRo9yU12geH7fkQ0WL?p=preview
This handles the Objects with array with objects inside it too and so on, by keeping arrays as arrays (which you can iterate over using map)
function snakeToCamelCase(snake_case_object){
var camelCaseObject;
if (isPlainObject(snake_case_object)) {
camelCaseObject = {};
}else if(isArray(snake_case_object)){
camelCaseObject = [];
}
forEach(
snake_case_object,
function(value, key) {
if (isPlainObject(value) || isArray(value)) {
value = snakeToCamelCase(value);
}
if (isPlainObject(camelCaseObject)) {
camelCaseObject[camelCase(key)] = value;
}else if(isArray(camelCaseObject)){
camelCaseObject.push(value);
}
}
)
return camelCaseObject;
}

This is my take; more readable and with less nesting than brandoncode's implementation, and with more room for handling edge cases like Date (which isn't handled, by the way) or null:
function convertPropertiesToCamelCase(instance) {
if (instance instanceof Array) {
var result = [];
for (var i = 0; i < instance.length; i++) {
result[i] = convertPropertiesToCamelCase(instance[i]);
}
return result;
}
if (typeof instance != 'object') {
return instance;
}
var result = {};
for (var key in instance) {
if (!instance.hasOwnProperty(key)) {
continue;
}
result[key.charAt(0).toLowerCase() + key.substring(1)] = convertPropertiesToCamelCase(instance[key]);
}
return result;
}

Building on goredwards answer (which didn't handle the array fields correctly)
function objectKeysToCamelCase(snake_case_object) {
let camelCaseObject = {}
_.forEach(
snake_case_object,
function(value, key) {
if (_.isPlainObject(value)) {
value = objectKeysToCamelCase(value)
} else if (_.isArray(value)) {
value = value.map(v => _.isPlainObject(v) ? objectKeysToCamelCase(v) : v)
}
camelCaseObject[_.camelCase(key)] = value
},
)
return camelCaseObject
}

here is code I found for it, not fully tested though, but worth sharing.
It is far more readable than other answers, not sure about performance.
test it http://jsfiddle.net/ms734bqn/1/
const toCamel = (s) => {
return s.replace(/([-_][a-z])/ig, ($1) => {
return $1.toUpperCase()
.replace('-', '')
.replace('_', '');
});
};
const isArray = function (a) {
return Array.isArray(a);
};
const isObject = function (o) {
return o === Object(o) && !isArray(o) && typeof o !== 'function';
};
const keysToCamel = function (o) {
if (isObject(o)) {
const n = {};
Object.keys(o)
.forEach((k) => {
n[toCamel(k)] = keysToCamel(o[k]);
});
return n;
} else if (isArray(o)) {
return o.map((i) => {
return keysToCamel(i);
});
}
return o;
};

Pure JavaScript, shoud work fine
function convertKeysToCamelCase(object) {
if(object === undefined || object === null || typeof object !== "object") {
return object;
} else {
if(Array.isArray(object)) {
return object.map(item => convertKeysToCamelCase(item));
} else {
return Object.entries(object).reduce((result, [key, value]) => {
result[key.charAt(0).toLowerCase() + key.slice(1)] = convertKeysToCamelCase(value);
return result;
}, {});
}
}
}

you can do this simply by using json-case-convertor
const jcc = require('json-case-convertor')
const jsonData = ''//you json data to convert
const camelCasedJson = jcc.camelCaseKeys(jsonData) //Convert all the keys of object to snake case
This will handle all cascaded object as well

Convert object keys to camelCase with deep.
import _ from 'lodash';
export function objectKeysToCamelCase(entity) {
if (!_.isObject(entity)) return entity;
let result;
result = _.mapKeys(entity, (value, key) => _.camelCase(key));
result = _.mapValues(result, (value) => objectKeysToCamelCase(value));
return result;
}

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