Oh! No! I´m strikes again! :D

@vanimoch3dx, Indeed. Is a simple script in Python3...
----------------
#!/usr/bin/env python

import sys
import os
import os.path
import json
################
# os.startfile("reduf.exe")

################################################################################
def parse_args(argv):
options = {}
if len(sys.argv) > 1:
options['input'] = sys.argv[1]

if len(sys.argv) > 2:
options['output'] = sys.argv[2]

return options

################################################################################
def validate_options(options):
if not 'input' in options:
raise RuntimeError("No [input] argument was provided")

if not (os.path.isfile(options['input']) or os.path.isdir(options['input'])):
raise TypeError("[input] '" + options['input'] + "' is not a file or directory")

if 'output' in options and os.path.isdir(options['input']) and not os.path.isdir(options['output']):
raise TypeError("[output] '" + options['output'] + "' must be a directory because [input] is a directory")

################################################################################
def print_help_and_exit():
sys.stdout.write("usage: " + os.path.basename(__file__) + " [input] [output]\n")
sys.stdout.write("Where [input] => path to dsf or duf file or directory\n")
sys.stdout.write(" [output] => path to output file or directory\n\n")
sys.exit(2)

################################################################################
def print_error_and_exit(message):
sys.stderr.write(message + "\n")
sys.exit(1)

################################################################################
def create_path(path):
abs_path = os.path.abspath(os.path.dirname(path))
if not os.path.exists(abs_path):
os.makedirs(abs_path)

################################################################################
def minify_file(input_filepath, output_path):
try:
filepath = os.path.abspath(input_filepath)
json_txt = open(filepath, 'r').read()
json_mini = json.dumps(json.loads(json_txt), separators=(',', ':'))

if len(output_path) > 0:
out_file = os.path.abspath(output_path)
create_path(out_file)
open(out_file, 'w').write(json_mini)

else:
sys.stdout.write(json_mini)

except Exception as e:
sys.stderr.write(str(e) + "\n")

################################################################################
def find_json_files(input_dir):
search_results = []
search_root = input_dir
for root, directories, files in os.walk(search_root):
for filename in files:
if os.path.splitext(filename)[1] == '.dsf':
relative_path = os.path.relpath(root, search_root)
search_results.append(os.path.join(relative_path, filename))
if os.path.splitext(filename)[1] == '.duf':
relative_path = os.path.relpath(root, search_root)
search_results.append(os.path.join(relative_path, filename))
return search_results

################################################################################
def minify_dir(dir_in, dir_out):
abs_dir_in = os.path.abspath(dir_in)
files = find_json_files(abs_dir_in)
for relative_filepath in files:
file_in = os.path.join(abs_dir_in, relative_filepath)
file_out = ""
if len(dir_out) > 0:
file_out = os.path.join(dir_out, relative_filepath)

minify_file(file_in, file_out)

################################################################################
options = parse_args(sys.argv)

try:
validate_options(options)

except Exception as e:
sys.stderr.write(str(e) + "\n")
print_help_and_exit()

try:
output = options['output'] if 'output' in options else ""

if os.path.isfile(options['input']):
minify_file(options['input'], output)

elif os.path.isdir(options['input']):
minify_dir(options['input'], output)

except Exception as e:
print_error_and_exit(str(e) + "\n")
---------------------
No more... (Of course, you need install the module "json".. I dont remeber the version..! 😀 https://pypi.org/search/?q=json
I think is this: https://pypi.org/project/json5/