jq is great. You can actually see how it's used to test the reference implementation of Son here (https://github.com/seagreen/Son/blob/master/implementation/t...) using `jq --compact-output --sort-keys .`

Unfortunately, jq doesn't provide flags to control scientific/non-scientific notation or which characters are escaped, meaning if you want very tight control over the JSON generated it's not a full option.

(Consider that the motivating example in the Son README isn't all you might want to use Son for. For instance some people need consistent hashing of serialized JSON documents).