code: public static String escapeDoubleQuotesForJson(String text) {
  		if ( text == null ) {
  			return null;
  		}
  		StringBuilder builder = new StringBuilder( text.length() );
  		for ( int i = 0; i < text.length(); i++ ) {
  			char c = text.charAt( i );
  			switch ( c ) {
  				case '"':
  				case '\\':
  					builder.append( "\\" );
  				default:
  					builder.append( c );
  			}
  		}
  		return builder.toString();
  	}
docs: If a text contains double quotes, escape them.
  
  @param text the text to escape
  @return Escaped text or {@code null} if the text is null