code: function stringify() {
  
    return map(function (chunk, next) {
      var stringified;
  
      try {
        stringified = JSON.stringify(chunk);
      } catch (e) {
        return next(e);
      }
  
      return next(null, stringified);
    });
  }
docs: Creates a new stream where every element in the source stream
  is converted to a string by using `JSON.stringify`.
  
  @static
  @since    1.1.0
  @category Modifiers
  
  @returns  {Stream.Transform} - Transform stream.
  
  @example
  
  // stringify every element in an object stream so it can be
  // piped to a non-object stream.
  objStream
  .pipe(nodeStream.stringify())
  .pipe(process.stdout);