If you want to keep your JavaScript variables or API KEY hidden, there are a few ways you can do this. One way is to use a JavaScript file that is not publicly accessible. Another way is to use a PHP or ASP file to store your variables.

There are a few ways to hide JavaScript variables, or API keys:
1. Use a JavaScript minifier, which will rename your variables and make them harder to read.
2. Use a JavaScript Obfuscator, which will make your code harder to read.
3. Use a tool like Grunt or Gulp to create a build process that minifies and obfuscates your code.
4. Keep your API keys in a separate file that is not accessible to the public.
or
5. Use the special method in this video