justifier

noun

1. One who, or that which, justifies some belief or action.
2. One who pardons and absolves from guilt and punishment.

   “God, essentially considered, in the person of the Father, is especially the justifier, in respect of judiciary power and authority.”

3. A machine, program or algorithm that justifies text by aligning it.

   “When the operator starts typing the third line, the justifier goes to work on the second.”