thank you for giving MapTiler Geocoding a try.
If you are using just backand for geocoding all you need is the MapTiler client library https://www.npmjs.com/package/@maptiler/client
It should be straight forward to get it installed and used, see https://docs.maptiler.com/client-js/geocoding/
Follow the Quickstart exxamples https://docs.maptiler.com/client-js/