Question

45

Convert returned JSON Object Properties to (lower first) camelCase

rated 0 times [ 46] [ 1] / answers: 1 / hits: 116395 / 12 Years ago, wed, october 17, 2012, 12:00:00

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?

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jazminuniquer

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answered 12 Years ago reecep · Accepted Answer

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

    }

}