table-layout
Stylable text tables, handling ansi colour. Useful for console output.
jsondiffpatch
JSON diff & patch (object and array diff, text diff, multiple output formats)
standard-json
Format JavaScript Standard Style output to a JSON array.
prettyjson
Package for formatting JSON data in a coloured YAML-style, perfect for CLI output
module-deps
walk the dependency graph to generate json output that can be fed into browser-pack