If you run the command npm start
and get the following error:
Invalid JwtGenerator options. apiKeyId is required
full error code can look like this:

Problem: it means that you didn't put correct APP_KEY_ID into a config.json
file.
Solution:
- check your
config.json
file, to be sure you didn't miss to admit API_KEY_ID - Go to your Virgil Dashboard (https://dashboard.virgilsecurity.com/) -> API KEYS section -> copy necessary API KEY ID (related to your API Private Key) ->

paste your App_Key_ID into your config.json -> save config file -> open CLI and run npm start.