Docly Developers
Function Updated 17 Oct 2026

String.toLowerCase()

Returns the string converted to lower case. Letters such as Æ, Ø and Å are converted too. toLocaleLowerCase() gives the same result.

See also String.toUpperCase

Parameters

This function takes no parameters.

Returns

A new string in lower case.

Example

Normal JavaScript, running in the browser or on the Docly™ server.
write("Hello WORLD".toLowerCase());   // hello world
write("\n");
write("ÆØÅ".toLowerCase());           // æøå
write("\n");
// Case-insensitive comparison
write("Admin".toLowerCase() === "admin");   // true