Parse a string as a JSON (JavaScript Object Notation) value. The returned value can be processed futher.

For example:

{{ "[1,2,3]"|from_json|first }}

Converts this JSON string to a list of integers and displays the first result:

1

Another example with a string that parses to a structured value:

{% with '{ "a": "Hello", "b": 2 }'|from_json as obj %}
    {% print obj.a %}
{% endwith %}

This will display:

Hello

If the given value can not be parsed as JSON then it is silently mapped to undefined.