Before you can deploy, you need to setup AWS credentials before deploying. You can do this by running aws configure and following the prompts.
Or, you can use the AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY environment variables.
$ export AWS_ACCESS_KEY_ID=your_access_key
$ export AWS_SECRET_ACCESS_KEY=your_secret_key$ npm install
$ npm run build
$ npx serverless deploy