Concatenate two JSON objects

Question

I have two JSON objects with the same structure and I want to concat them together using Javascript. Is there an easy way to do this?

Answer 1

Based on your description in the comments, you'd simply do an array concat:

var jsonArray1 = [{'name': "doug", 'id':5}, {'name': "dofug", 'id':23}]; var jsonArray2 = [{'name': "goud", 'id':1}, {'name': "doaaug", 'id':52}]; jsonArray1 = jsonArray1.concat(jsonArray2); // jsonArray1 = [{'name': "doug", 'id':5}, {'name': "dofug", 'id':23},  //{'name': "goud", 'id':1}, {'name': "doaaug", 'id':52}]; 

Answer 2

If you'd rather copy the properties:

var json1 = { value1: '1', value2: '2' }; var json2 = { value2: '4', value3: '3' };   function jsonConcat(o1, o2) {  for (var key in o2) {   o1[key] = o2[key];  }  return o1; }  var output = {}; output = jsonConcat(output, json1); output = jsonConcat(output, json2); 

Output of above code is{ value1: '1', value2: '4', value3: '3' }

Answer 3

The actual way is using JS Object.assign.

Object.assign(target, ...sources)

MDN Link

There is another object spread operator which is proposed for ES7 and can be used with Babel plugins.

 Obj = {...sourceObj1, ...sourceObj2}