import re


def strip_json(string_value):
    """Strip a string containing a JSON document and remove all redundant white-space symbols.

    :param string_value: String containing a JSON document
    :type string_value: str

    :return: String containing a JSON document without redundant white-space symbols
    :rtype: str
    """
    result = string_value.replace("\n", "")
    result = re.sub(r"{\s+", "{", result)
    result = re.sub(r"\s+}", "}", result)
    result = re.sub(r",\s+", ", ", result)

    return result