Using a change node to change payload (or whatever string) to lowercase?

[Nodi.Rubrum]

Using a change node to change payload (or whatever string) to lowercase? To error results:

What boneheaded thing am I forgetting?

[gregorius]

try: $lowercase($$.payload)

EDIT:

There is also the test tab in the JSON editor:

can be very very useful (as opposed to being "just" useful!)

[E1cid]

There are example of all theJSONata function in the change node editor or at JSONata Documentation · JSONata

[Steve-Mcl]

I don't often install contrib nodes for things I know how to do in a function (or if I must, a change node+jsonata) but one I can definitely recommend for strings is node-red-contrib-string.

It's quite well thought out and quite extensive e.g:

[Nodi.Rubrum]

When I need to code significantly... I use function nodes. But when it is a one-off, a one-liner, I tend to use a change node if applicable, easier to understand, especially when you share the flow to some one else. Not everyone is well versed in TypeScript or even JavaScript.