Example 1: how to declare 3d array in javascript var myArray = [ [ [ ] ] ] ; Example 2: javascript define multidimensional array var iMax = 20 ; var jMax = 10 ; var f = new Array ( ) ; for ( i = 0 ; i < iMax ; i ++ ) { f [ i ] = new Array ( ) ; for ( j = 0 ; j < jMax ; j ++ ) { f [ i ] [ j ] = 0 ; } } Example 3: multi-dimensional array js var array = [ [ "0, 0" , "1, 0" , "2, 0" , "3, 0" , "4, 0" ] , [ "0, 1" , "1, 1" , "2, 1" , "3, 1" , "4, 1" ] , [ "0, 2" , "1, 2" , "2, 2" , "3, 2" , "4, 2" ] , [ "0, 3" , "1, 3" , "2, 3" , "3, 3" , "4, 3" ] , [ "0, 4" , "1, 4" , "2, 4" , "3, 4" , "4, 4" ] , ] ; // Think of it as coordinates, array[x, y] x = 0; y = 0; is "0,