Treevis is a small utility to graph LeetCode trees. It's useful to debug visually test cases.

If you want to install it globally so it gets added to your $PATH you can do it with

$ npm install -g treevis
# or
$ yarn global add treevis

then

$ treevis <tree in array form>

Or if you don't want to install globally, and just want to run some tests

$ npx treevis <tree in array form>

Make sure to wrap your tree in single quotes otherwise your shell might try to interpret the square brackets.

$ treevis '[5,4,7,3,null,2,null,-1,null,9]'
       5
      / \
     /   \
    4     7
   /     /
  3     2
 /     /
-1    9