Error: connect ECONNREFUSED 127.0.0.1:80

[throker]

Caveat: I'm a complete novice with NPM/NPX and such.

running it results:

npx udt-labelme-converter --input=udt-test.json --output=labelme-files
npx: installed 87 in 3.437s

===========Converting process started===========
error with sample
Error: connect ECONNREFUSED 127.0.0.1:80
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1145:16)
Error: connect ECONNREFUSED 127.0.0.1:80

I tried installing it with npm:

npm install udt-labelme-converter
npm WARN deprecated request@2.88.2: request has been deprecated, see https://github.com/request/request/issues/3142
npm WARN deprecated har-validator@5.1.5: this library is no longer supported
npm WARN saveError ENOENT: no such file or directory, open '/Users/throk/SCRATCH/udt-labelme-converter/package.json'
npm notice created a lockfile as package-lock.json. You should commit this file.
npm WARN enoent ENOENT: no such file or directory, open '/Users/throk/SCRATCH/udt-labelme-converter/package.json'
npm WARN udt-labelme-converter No description
npm WARN udt-labelme-converter No repository field.
npm WARN udt-labelme-converter No README data
npm WARN udt-labelme-converter No license field.

+ udt-labelme-converter@0.1.7
added 87 packages from 78 contributors and audited 87 packages in 3.084s

4 packages are looking for funding
  run `npm fund` for details

found 0 vulnerabilities

I installed NPM via Homebrew on my Mac, seems to be working for other npm things.

npm version
{
  npm: '6.14.8',
  ares: '1.16.0',
  brotli: '1.0.9',
  cldr: '37.0',
  icu: '67.1',
  llhttp: '2.1.2',
  modules: '83',
  napi: '6',
  nghttp2: '1.41.0',
  node: '14.11.0',
  openssl: '1.1.1g',
  tz: '2019c',
  unicode: '13.0',
  uv: '1.39.0',
  v8: '8.4.371.19-node.16',
  zlib: '1.2.11'
}