jms/serializer-bundle

config/packages/dev/jms_serializer.yaml

jms_serializer:
    visitors:
        json_serialization:
            options:
                - JSON_PRETTY_PRINT
                - JSON_UNESCAPED_SLASHES
                - JSON_PRESERVE_ZERO_FRACTION

config/packages/jms_serializer.yaml

jms_serializer:
    visitors:
        xml_serialization:
            format_output: '%kernel.debug%'
#    metadata:
#        auto_detection: false
#        directories:
#            any-name:
#                namespace_prefix: "My\\FooBundle"
#                path: "@MyFooBundle/Resources/config/serializer"
#            another-name:
#                namespace_prefix: "My\\BarBundle"
#                path: "@MyBarBundle/Resources/config/serializer"

config/packages/prod/jms_serializer.yaml

jms_serializer:
    visitors:
        json_serialization:
            options:
                - JSON_UNESCAPED_SLASHES
                - JSON_PRESERVE_ZERO_FRACTION