JavaScript - convert json text to string variable

function parseString(json) {

    var text = JSON.parse(json);

​

    if(typeof(text) == 'string') {

        return text;

    }

​

    throw new Error('Incorrect type!');

}

​

// Example:

​

var json = '"This is example text..."';

var text = parseString(json);

​

console.log(text);

var JsonUtils = new function() {

  var expression = /(\\*)"/g;

​

  function getContent(json) {

    if (json) {

      var limit = json.length - 1;

​

      if (json[0] == '"' && json[limit] == '"') {

        return json.substring(1, limit);

      }

    }

​

    return null;

  }

​

  this.parseString = function(json) {

    var content = getContent(json);

​

    if (content) {

      var result = content.replace(expression, function(value, escape) {

        if(escape.length % 2) {

          var result = '';

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          for(var i = 1; i < escape.length; i += 2) {

            result += '\\';

          }

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          return result + '"';

        }

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        throw new Error('Incorrect json format!');

      });

      return result;

    }

​

    throw new Error('Incorrect json format!');

  }

};

​

// Example:

​

var json = '"Example SQL query: \\"SELECT * FROM `users`;\\""';

var text = JsonUtils.parseString(json);

​

console.log(text);