Override file properties

[flatiron32]

I have a config file such as
{ "database": { "host": "localhost", "port": "13306", "user": "root" } }

I am calling this in my code:

var nconf = require('nconf');

nconf.argv().env().file({
  file: 'db/config.json'
});

console.log(nconf.get("database:host"));

My assumption was that I would be able to override the value in the config file using an environment variable such as database:host=somethingElse npm test. However either I cannot figure out how to encode the colon or it is not possible to have a colon in an environment key.

How does one override these properties.

[flatiron32]

I think I have figured it out by setting the logicalSeparator in the env() call to '_' and then setting database_host. Is this documented anywhere outside of the code? If not, I would gladly write some.

I was a little surprised to be bit by using nconf in two files and one overwriting the other.

[flatiron32]

I also seem to need to call nconf.get() before the override is applied. Is that normal?