CREDIT TO:
http://www.json-generator.com/

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User template:

[
  {
    'repeat(50, 50)': {
      serial: '{{index(1)}}',
      name: { 
        first: '{{firstName()}}',
        last: '{{surname()}}'
      },
      user_name: function () {
        return ('username' + this.serial);
      },      
      password: '{{objectId()}}',
      phone: '+1 {{phone()}}',
      email: function () {
        // Email tag is deprecated, because now you can produce an email as simple as this:
        return (this.name.first + '.' + this.name.last + '@' + this.name.first + this.name.last + '.com');
      }
    }
  }
]

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Exam template:

[
  {
    'repeat(50, 50)': {
      id: '{{index(1)}}'
      serial: '{{integer(300, 325)}}',
      course_code: function () {
        return ('CSC' + this.serial);
      },
      year: '{{integer(2012,2016)}}',
      term: '{{random("fall", "winter", "summer")}}',
      type: '{{random("final", "midterm")}}',
      instructors: ['{{firstName()}} {{surname()}}',
                    '{{firstName()}} {{surname()}}'],
      page_count: '{{integer(10,20)}}',
      questions_count: function () {
        return (this.page_count);
      },
      uploaded_by: 'admin0'
    }
  }
]

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