Generate mock json data with a structured template using Faker under the hood

jsonfaker.py

#!/usr/bin/python3
# ~$ ./jsonfaker.py <json_template>

import sys
import re
from faker import Faker
from faker.providers import BaseProvider


class customProvider(BaseProvider):
    sentences = (
        'Hello world',
        'Hi there',
        'Ciao Bello',
    )

    def greeting(self):
        return self.random_element(self.sentences)


fake = Faker()
fake.add_provider(customProvider)
jsontemplate = sys.argv[1]
pattern = r'\{\{\w+\([\w=,\s?#\'\":-]*\)\}\}'

with open(jsontemplate) as f:
    content = f.read().splitlines()

for line in content:
    num = len(re.findall(pattern, line))
    if num != 0:
        newline = line
        for i in range(1, num+1):
            item = re.findall(pattern, newline)
            newline = newline.replace(item[0], str(eval('fake.' + re.sub(r'[\{\}]', '', item[0]))), 1)
        print(newline)
    else:
        print(line)

template.json

[
  {
    "product_number": "{{bothify(text='????-########', letters='ABCDE')}}",
    "hostname": "{{hostname(2)}}",
    "attributes": [
      {
        "ean": "{{ean13(leading_zero=False)}}",
        "random_number": "{{pyint(min_value=1, max_value=999, step=1)}}",
        "color": "{{color_name()}} {{color_name()}}",
        "text": "static text",
        "custom_greeting": "{{greeting()}}"
      }
    ]
  }
]

Need to repeat a certain part of the template? Using jq and creating a new template will simply do the job, for example:
jq '.[].attributes += $el' --argjson el "$(jq '.[].attributes' template.json)" template.json > newtemplate.json

Need more repeats? for loop it.

Move to https://github.com/KevCui/Fakergen