If you have a multi-language store and want to add Store Codes to this is the tutorial for you.
So your example urls will look like this yourdomain.com/en, yourdomain.com/us, yourdomain.com/uk.
Follow the below steps.
- Login to the Magento 2 admin panel
- Navigate to Stores > Configuration > General > Web and find the Url Options section.
- Choose to Add Store Code to URLs selecting Yes from the corresponding select box and Save Config.
- Clear Cache.