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Validates that a field is empty. The opposite of notEmpty.

Options

Option	Type	Default	Description
trim	boolean	false	If true, trims whitespace before checking — " " becomes valid
message	string	locale default	Custom error message

Playground

Valid values

Value	Notes
""	Empty string
" "	Whitespace only (when trim: true)

Invalid values

Value	Reason
"hello"	Non-empty string
"0"	The string "0" is not empty
" "	Whitespace only (when trim: false, the default)

Notes

• Common use case: honeypot fields — hidden inputs that should remain empty to detect bots.
• Use trim: true if you want whitespace-only values to also be considered empty.