From Roll20 Wiki
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The Roll20 API provides a powerful way to customize and enhance your game. You write scripts (little pieces of code) that tell Roll20 what to do during gameplay (for instance, move a piece, add a status marker to a token, or even roll dice). It's simple and straightforward to get started, but the possibilities are endless.
What do I need to get started?
How does it work?
You write scripts that listen to events that happen during the game. Scripts can check to make sure that rules are followed, change properties on objects and tokens, and even provide custom chat commands. The scripts you write run across the entire game, and affect things the GM does as well as all the players. Advanced scripts can also run independently, performing automatic actions such as moving a token on a patrol route or nudging players when their turn is taking too long.
To get started, your first stop should be the Use Guide.
Where can I find pre-made scripts?
If you're looking for scripts other members of the community have made or are eager to share your own work, check out the API Script Index.