You can search for a particular HSN Code/Description of specific goods or services in pre-login and post-login mode on the GST Portal.
Pre-Login: Navigate to Services > User Services > Search HSN Code option.
Post-Login: Login to the GST Portal with valid credentials and then navigate to Services > User Services > Search HSN Code.
Navigate to Services > User Services > Search HSN Code > below “Search HSN Chapter by Code” text box, click Download HSN Directory in Excel Format option to download the HSN details.