union-array unionarray is used for to form union from n no of arrays(>=1) without duplicates Install npm install --save union-array Usage const array_union=require('union-array'); array_union.union([1,4,4,3,'a'],[4,5,6,'G'],[5,7,4,'g','t']); //result will be [ 1, 4, 3, 'a', 5, 6, 'G', 7, 'g', 't' ]