If you run the command npm start  and get the following error:
 Invalid JwtGenerator options. apiId is required    

full error code can look like this:

Problem: it means that you didn't put correct APP_ID into a config.json  file. 

Solution

  1. check your config.json  file, to be sure you didn't miss to admit API_ID 
  2. Go to your Virgil Dashboard (https://dashboard.virgilsecurity.com/) -> open necessary Application -> copy Application ID 

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

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