Leetcode,

Deno collections library has very much to offer like :

1. binary tree: https://deno.land/std@0.133.0/collections/bs_tree.ts
2. binary heap: https://deno.land/std@0.133.0/collections/binary_heap.ts
3. array permutation: https://deno.land/std@0.133.0/collections/permutations.ts
4. red black tree: https://deno.land/std@0.133.0/collections/rb_tree.ts
5. sliding window: https://deno.land/std@0.133.0/collections/sliding_windows.ts
   and much more

Node.js dont have any of these.

Also deno compiles both javascript and typescript. So your backend will be much simpler than what you are currently using.

Thanks
Aditya