Having Trouble With Defining Things

So, I’m trying to use Discord.js to host a bot.

I am trying to define things like Versions and stuff with:
Version : "V1.5"
And this isn’t working when I type:
("Bot Version: " + Version) – This is with some stuff before it.

Is this how I should define something?

Assigning variables in JavaScript would typically be done like the following.

var version = "v1.5";