how to add key value pair in the JSON object already declared

Question

I have declared a JSON Object and added some key value pair in that like   var obj          and added some data into it like   obj      1   aa    2   bb       But I want to add more key value pair in the same object  if I add key value pair same above mentioned then it replace the old one  So could any one please tell me how I can append data in the same JSON Object i e  obj

User · Answer

Object assign copies one or more source objects to the target object. So we could use Object.assign here.

Syntax: Object.assign(target, ...sources)

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var obj  = {};_x000D_
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Object.assign(obj, {"1":"aa", "2":"bb"})_x000D_
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console.log(obj)

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User · Answer

Please try following simple operations on a json  insert update push   var movie json                          id   100                         to insert new key value to movie json movie json  name      Harry Potter   console log  new key      movie json      to update a key value in movie json movie json  id     101  console log  updated key     movie json      adding a json array to movie json and push a new item  movie json  movies     The Philosopher s Stone    movie json  movies   push  The Chamber of Secrets    console log movie json

User · Answer

Could you do the following   obj          1   aa        2   bb       var newNum    3   var newVal    cc     obj newNum    newVal     alert obj  3        this would alert  cc

User · Answer

You can use dot notation or bracket notation      var obj       obj        1    aa      2    bb      obj another    valuehere   obj  3      cc

User · Answer

You can add more key value pair in the same object without replacing old ones in following way   var obj        obj      1    aa    2    bb      obj  3      cc     Below is the code and jsfiddle link to sample demo that will add more key value pairs to the already existed obj on clicking of button   var obj          1    aa        2    bb      var noOfItems   Object keys obj  length       btnAddProperty   on  click   function         noOfItems        obj noOfItems      trim     txtName   val         console log obj         https   jsfiddle net shrawanlakhe 78yd9a8L 4

User · Answer

you can do try lodash Example code  for json object   x000D   x000D      var user     user   barney   age  36       user  newKey     true      console log user   x000D   lt script src  https   cdnjs cloudflare com ajax libs react 16 6 3 umd react production min js  gt  lt  script gt   lt script src  https   cdnjs cloudflare com ajax libs react-dom 16 6 3 umd react-dom production min js  gt  lt  script gt   lt script src  lodash js  gt  lt  script gt  x000D   x000D   x000D   for json array elements Example code   x000D   x000D  var users          user    barney    age   36         user    fred      age   40       users map i  gt  i  newKey     true     console log users   x000D   lt script src  https   cdnjs cloudflare com ajax libs react 16 6 3 umd react production min js  gt  lt  script gt   lt script src  https   cdnjs cloudflare com ajax libs react-dom 16 6 3 umd react-dom production min js  gt  lt  script gt   lt script src  lodash js  gt  lt  script gt  x000D   x000D   x000D

User · Answer

Hi I add key and value to each object    x000D   x000D  let persons     x000D      x000D      name    John Doe Sr   x000D      age  30 x000D        x000D      name   John Doe Jr   x000D      age   5 x000D      x000D    x000D   x000D  function addKeyValue obj  key  data   x000D    obj key    data  x000D    x000D    x000D   x000D  let newinfo   persons map function person    x000D    return addKeyValue person   newKey    newValue    x000D      x000D   x000D  console log persons   x000D   x000D   x000D

User · Answer

possible duplicate   best way to achieve same as stated below   function getKey key      return    key       var obj    key1   value1   key2   value2    getKey  key3      value3      https   stackoverflow com a 47405116 3510511

[javascript] how to add key value pair in the JSON object already declared

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