How to join two JSON Array objects in Node

var output = obj1.concat(obj2);

obj1 = [ { t: 1, d: 'AAA', v: 'yes' },
         { t: 2, d: 'BBB', v: 'yes' }]

obj2 = [ { t: 3, d: 'CCC', v: 'yes' },
        { t: 4, d: 'DDD', v: 'yes' }]

var output = obj1.concat(obj2);

console.log(output);

try

  Object.assign(obj1, obj2);

For Details check Here

 var o1 = { a: 1 };
 var o2 = { b: 2 };
 var o3 = { c: 3 };

 var obj = Object.assign(o1, o2, o3);
 console.log(obj); // { a: 1, b: 2, c: 3 }