The json_encode filter returns the JSON representation of a value:
{{ data|json_encode() }}
Note
Internally, Twig uses the PHP json_encode function.
options: A bitmask of json_encode options ({{
data|json_encode(constant('JSON_PRETTY_PRINT')) }}. Combine constants using Twig's bitwise operators: {{
data|json_encode(constant('JSON_PRETTY_PRINT') b-or constant('JSON_HEX_QUOT') }})
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https://twig.symfony.com/doc/2.x/filters/json_encode.html