# Trait Generator

Trait Generator is a piece of JavaScript code that gets invoked for making tokens evolve. Trait generator defines, what traits and properties the token will have.

Trait generator defines for each NFT:

Traits: Visible to public in metadata, on marketplaces.
Properties: Not visible, internal data storage.

Trait generator also decides, if a new generation should be created.

You can learn how Trait Generator works in this boilerplate repository:

Trait Generator boilerplate

https://github.com/snarkdotart/og-artwork-scene-boilerplate