Add new attribute element to JSON object using JavaScript

Question

How do I add new attribute  element  to JSON object using JavaScript

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extend  function        if arguments length     0   return        var x   arguments length     1   this   arguments 0       var y       for var i   1  len   arguments length  i  lt  len  i              y   arguments i           for var key in y               if   y key  instanceof Function                    x key    y key                                                  return x      Extends multiple json objects  ignores functions    extend  obj   hej     obj2   helo     obj3   objinside   yes        Will result in a single json object

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thanks for this post  I want to add something that can be useful   For IE  it is good to use   object  property     value    syntax because some special words in IE can give you an error   An example    object class    value     this fails in IE  because  class  is a special word  I spent several hours with this

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You can also dynamically add attributes with variables directly in an object literal   const amountAttribute    amount   const foo                      amountAttribute   1                foo amountAttribute      more     2    Results in         amount  1       amount  more  2

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Uses   extend   of jquery  like this   token     token window Laravel csrfToken   data    v1  asdass  v2  sdfsdf   dat     extend token data      I hope you serve them

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You can also add new json objects into your json  using the extend function   var newJson     extend      my  json     other  json        result - gt   my   json   other   json     A very good option for the extend function is the recursive merge  Just add the true value as the first parameter  read the documentation for more options   Example   var newJson     extend true            my  json       nestedJson   a1 1  a2 2           other  json       nestedJson   b1 1  b2 2         result - gt   my   json   other   json   nestedJson   a1 1  a2 2  b1 1  b2 2

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With ECMAScript since 2015 you can use Spread Syntax      three dots    let  people     id  4  firstName   John    people        people  secondName   Fogerty      It s allow you to add sub objects   people        people  city    state   California        the result would be           id   4      firstName    John       secondName    Forget       city              state    California           You also can merge objects   var mergedObj        obj1     obj2

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You can also use Object assign from ECMAScript 2015  It also allows you to add nested attributes at once  E g    const myObject        Object assign myObject        firstNewAttribute            nestedAttribute   woohoo               Ps  This will not override the existing object with the assigned attributes  Instead they ll be added  However if you assign a value to an existing attribute then it would be overridden

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A JSON object is simply a javascript object  so with Javascript being a prototype based language  all you have to do is address it using the dot notation   mything NewField    foo

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var jsonObj         members                            host   hostName               viewers                                 user1   value1                   user2   value2                   user3   value3                             var i   for i 4  i lt  8  i         var newUser    user    i      var newValue    value    i      jsonObj members viewers newUser    newValue       console log jsonObj

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JSON stands for JavaScript Object Notation   A JSON object is really a string that has yet to be turned into the object it represents   To add a property to an existing object in JS you could do the following   object  property     value    or    object property   value    If you provide some extra info like exactly what you need to do in context you might get a more tailored answer

[javascript] Add new attribute (element) to JSON object using JavaScript

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