get all slack ids in your slack workspace

README.md

python list_all_slack_id.py xoxp-000000000000-abcdef

output will be like

https://slack.com/api/channels.list?token=xoxp-000000000000-abcdef
https://slack.com/api/usergroups.list?token=xoxp-000000000000-abcdef
https://slack.com/api/users.list?token=xoxp-000000000000-abcdef
{'CB0000000': 'general',
 'CB0000000': 'random',
 'UB0000000': 'umihico',
 'USLACKBOT': 'slackbot'}

use grep to filter the output

list_all_slack_id.py

import requests
import pprint
urls=[
    "https://slack.com/api/channels.list",
    "https://slack.com/api/usergroups.list",
    "https://slack.com/api/users.list",
]
json_keys=[
    'channels',
    'usergroups',
    'members',
]

import sys
token=sys.argv[1]

result={}

for url, key in zip(urls, json_keys):
    print(url+"?token="+token)
    result.update({d['id']:d['name'] for d in requests.get(url+"?token="+token).json()[key]})

pprint.pprint(result)