code: function _prettyGraphSONString(ugly) {
          var lines = ugly.trim().split(require('os').EOL);
          var vertices = _.map(lines, function (line) { return _parseVertex(line); });
          vertices.sort(_compareById);
          // Compute the stable JSON.
          var stringifyOpts = {
              space: 2
          };
          var prettyString = jsonStableStringify(vertices, stringifyOpts) + '\n';
          return prettyString;
      }
docs: ### `prettyGraphSONString(ugly: string)` Make a GraphSON string pretty, adding indentation and deterministic format.