A simple Python script that will convert and encode a Big List of Naughty Strings (BLNS) into a JSON file that Postman can use

txt_to_postman_b64_json.py

#!/usr/bin/env python3

from argparse import ArgumentParser, Namespace
import os
import base64
import json

def main(srcFile: str, dstFile:str) -> None:

        if not os.path.isfile(srcFile):
                print( '-s argument is invalid. Is it a proper BLNS txt file? Aborting!' )
                return

        with open(srcFile, 'r') as f:
                # put all lines in the file into a Python list
                content = f.readlines()

                # above line leaves trailing newline characters; strip them out
                content = [x.strip('\n') for x in content]

                # remove empty-lines and comments
                content = [x for x in content if x and not x.startswith('#')]

                # Base64 encode all content to make Postman Collection Runner parser to not break
                content = [base64.b64encode(x.encode('utf-8')).decode('utf-8') for x in content]

                # insert empty string since all are being removed
                content.insert(0, "")

        encodedContent: list = []
        for c in content:
                encodedContent.append({"encodedNaughtyString": c})

        with open(dstFile, 'w') as f:
                # write JSON to file; note the ensure_ascii parameter
                json.dump(encodedContent, f, indent=2, ensure_ascii=False)


if __name__ == '__main__':
        parser = ArgumentParser()
        parser.add_argument( '-s', '--src', help='The source BLNS txt file to convert', type=str, required=True)
        parser.add_argument( '-d', '--dst', help='The destination filename of the encoded BLNS CSV', type=str, required=True)

        args: Namespace = parser.parse_args()
        main(args.src, args.dst)