How do I get the current user ID in Apex?

Call UserInfo.getUserId(). It returns the 18-character ID of the user running the code without a SOQL query.

How do I get the current user's email in Apex?

Use UserInfo.getUserEmail(). For other User fields that UserInfo doesn't return, query the User object with WHERE Id = :UserInfo.getUserId().

What does UserInfo.getDefaultCurrency() return?

The user's default currency ISO code in a multi-currency org, or the org's currency in a single-currency org. In my single-currency test org it returned INR, and isMultiCurrencyOrganization() returned false.

How do I get the current user's profile name in Apex?

UserInfo.getProfileId() returns only the ID. Query [SELECT Profile.Name FROM User WHERE Id = :UserInfo.getUserId()] to get the name.

Why does getUiThemeDisplayed() return Theme3 in Lightning?

It returns the theme of the request the code runs in. From the Developer Console it returned Theme3 (Classic) even for a Lightning user; from a Lightning page it returns Theme4d.

Get Current User Info in Salesforce Apex (UserInfo)

To get current user info using Apex in Salesforce, call the static methods of the built-in UserInfo class: UserInfo.getUserId() returns the user’s ID, UserInfo.getUserEmail() the email, UserInfo.getProfileId() the profile, and so on. They need no SOQL query, so they don’t count against query limits.

Most tutorials list these methods without showing what they actually return. I ran every UserInfo method in a Salesforce Developer Edition org, so below you’ll see real output, plus the two cases where UserInfo isn’t enough (profile and role names) and the options for flows, formulas and Lightning web components.

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