[Newbie question] Recommended tool for the base64 encoding of <client_id:client_secret> ?

[Solid_Tester]

My Question or Issue

I tried the Client Credentials Flow
(which is the 4th authorization flow in the Authorization Guide),
Step 1: Have your application request authorization

and I got an error.

Step 1 is basically this cURL command:

curl -X "POST"
-H "Authorization: Basic <base64 encoded client_id:client_secret>"
-d grant_type=client_credentials
https://accounts.spotify.com/api/token

I'm not confident with the base64 encoding of the "client_id:client_secret" couple there.
I've used Windows "certUtil -encode" command-line.

Is there a recommended tool for this base64 encoding ?

Plan

Free

Country

Romania

Device

Dell laptop

Operating System

Windows 10

[Madbrad200]

Just use https://www.base64encode.org/ or a similar tool.

[Yanine98]

On Windows you don't need any program to do this, you can use the CMD certutil command, although Microsoft does not recommend using it in a live environment: https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/certutil

I would rather recommend the PowerShell solution, where there are ConvertTo-Base64 and ConvertFrom-Base64 cmdlets. Here is a concrete description if you would implement it: https://b64encode.com/blog/base64-in-powershell/