Welcome to the Auth0 Community.
In terms of the Management API. Using the explorer for me is the best way to get started and you’ll need an access token with permissions to query the API, see here for a testing scenario https://auth0.com/docs/secure/tokens/access-tokens/get-management-api-access-tokens-for-testing
In a nutshell you can grab an access token by logging into your Auth0 Tenant and going to Applications > APIs > Auth0 Management API > “API Explorer” tab (the “Test” tab will also provide useful info in how to get an access token and how to use it).
Copy the provided token from the “API Explorer”. Then click on “Documentation” in the top right corner and select “Management API”. There’ll be a “SET API Token” button on the right hand side, click the button and paste the token in there.
You should now be able to click any of the endpoints from the left hand side and test them, also you can get the curl alternatives to execute on the command line/terminal.
In terms of the Node Management API Client, we have documentation for that here:
Getting started: GitHub - auth0/node-auth0 at 13b2008d2215b6020da76ea541120491f7776a03
Management API: ManagementClient | auth0
Examples: node-auth0/EXAMPLES.md at master · auth0/node-auth0 · GitHub
This should get you started. Let us know if you need anything further.
Warm regards