Make sure you have a Snipcart API key available before running, if you don't have one then you can register for a free Snipcart account and you'll find one in your Snipcart dashboard. Add this API key in your .env file at the root of the project or add it directly in the nuxt.config.js file.
# install dependencies
$ npm install
# serve with hot reload at localhost:3000
$ npm run dev
# build for production and launch server
$ npm run build
$ npm run start
# generate static project
$ npm run generate
For detailed explanation on how things work, check out Nuxt.js docs.