getExtensionName

The getExtensionName() function returns the last extension of a path, with or without the leading dot.

WARNING

Works only with POSIX paths (not Windows paths).

Interactive example

Syntax

function getExtensionName<
	GenericPath extends string
>(
	path: GenericPath,
	params?: {
		withDot?: boolean;
	}
): string | null;

Parameters

• path : The path to analyze.
• params : Optional behavior options.
• params.withDot : When true, keeps the leading dot in the returned extension.

Return value

The last extension segment:

• without the dot by default (for example txt)
• with the dot when withDot is true (for example .txt)
• null when no extension is found

See also

• getBaseName - Returns the last segment of a path
• getParentFolderPath - Returns the parent folder