Extract Emails from Npm Packge Names - https://api.npms.io/

npm-package-emails.py

import requests
import sys
import json
import concurrent.futures

output_file = open("emails_res.txt", "w")

def Emails(package):

	req = requests.get("https://api.npms.io/v2/package/{}".format(package))
	resp = json.loads(req.text)
	try:
		for key, value in resp.items():
			if key == "collected":
				metadata = value['metadata']
				emails = len(metadata['maintainers'])
				for email in range(0, emails):
					email_obj = metadata['maintainers'][email]
					for key, value in email_obj.items():
						if "email" in key:
							print(value)
							output_file.write(str(value)+"\n")

	except Exception as e:
		print(e)

if __name__ == '__main__':

	packages_list = []

	packages = open("all_packages_names.txt", "r")
	for package in packages:
		package = package.strip()
		packages_list.append(package)

	packages.close()

	with concurrent.futures.ThreadPoolExecutor(max_workers=100) as executor:
		executor.map(Emails, packages_list)

	output_file.close()