$ git clone https://github.com/martmists/nbt2json
$ cd nbt2json
$ sudo ./install.sh

$ nbt2json -h
usage: nbt2json [-h] [--pretty] [--inplace] files [files ...]

positional arguments:
  files       NBT file to jsonify

optional arguments:
  -h, --help  show this help message and exit
  --pretty    Pretty-print output
  --inplace   Create JSON files in-place