Entity Parser with twig extension

Node Parser for twig 

{% set options ={'#entity_parser_extend':'Drupal\\entity_parser_demo\\EntityParserDemo'} %}
{% set fields = {1:'body',2:'title'} %}
{% set node_array = node_parser(content,fields,options)%}

<div class='title'>{{node_array.title}}</div>
<div class='body'>{{node_array.body|first.summary}}</div>

Block content Parser for twig 

if you create a custom block call : "test"   in backend   url : www.domain.com/block/add , then you  want to handle the block content in block--test.html.twig 

{% set options = {'#entity_parser_extend':'Drupal\\entity_parser_demo\\EntityParserDemo'} %}
{% set fields = {} %} {# make empty for getting all fields #}
{% set block_content_array = (block_parser(content,fields,options)) %}

<div>(block_content_array.body|first).summary</div>