Zeplin generates React Native code snippets on iOS and Android projects from layers, colors, and text styles.
You can add the React Native extension to your iOS or Android project from this link: https://extensions.zeplin.io/5a8b2e313fe2aa400ab41e17
If you have a Web project, sadly it's not possible to change the project type, since Zeplin generates all the resources while exporting them from Sketch/Photoshop. We'd highly recommend creating a new project and exporting your artboards again.
We'll keep improving Zeplin's React support, so please let us know if you have any suggestions! 💪