You might also be interested in go-libucl, a set of Go bindings for UCL, the Universal Configuration Language. UCL is a bit like JSON, but with better support for humans: it supports comments and human-readable constructs like SI multipliers (10k, 40M, etc.) and has a little bit less boilerplate (e.g., quotes around keys). It's actually pretty close to the nginx configuration file format, if you're already familiar with that.
